[PATCH] binfmt_elf: CodingStyle cleanup and remove some pointless casts
Do a CodingStyle cleanup of fs/binfmt_elf.c and also remove some pointless casts of kmalloc() return values in the same file. Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jesper Juhl
Linus Torvalds
parent
11420211b8
commit
f4e5cc2c44
332
fs/binfmt_elf.c
332
fs/binfmt_elf.c
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@ -38,15 +38,13 @@
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#include <linux/security.h>
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#include <linux/syscalls.h>
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#include <linux/random.h>
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#include <linux/elf.h>
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#include <asm/uaccess.h>
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#include <asm/param.h>
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#include <asm/page.h>
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#include <linux/elf.h>
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static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs);
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static int load_elf_library(struct file*);
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static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs);
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static int load_elf_library(struct file *);
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static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, int, int);
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extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
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@ -59,15 +57,15 @@ extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
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* don't even try.
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*/
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#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
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static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file);
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static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file);
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#else
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#define elf_core_dump NULL
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#endif
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#if ELF_EXEC_PAGESIZE > PAGE_SIZE
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# define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
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#define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
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#else
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# define ELF_MIN_ALIGN PAGE_SIZE
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#define ELF_MIN_ALIGN PAGE_SIZE
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#endif
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#ifndef ELF_CORE_EFLAGS
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@ -86,7 +84,7 @@ static struct linux_binfmt elf_format = {
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.min_coredump = ELF_EXEC_PAGESIZE
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};
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#define BAD_ADDR(x) ((unsigned long)(x) > TASK_SIZE)
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#define BAD_ADDR(x) ((unsigned long)(x) > TASK_SIZE)
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static int set_brk(unsigned long start, unsigned long end)
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{
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@ -104,13 +102,11 @@ static int set_brk(unsigned long start, unsigned long end)
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return 0;
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}
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/* We need to explicitly zero any fractional pages
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after the data section (i.e. bss). This would
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contain the junk from the file that should not
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be in memory */
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be in memory
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*/
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static int padzero(unsigned long elf_bss)
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{
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unsigned long nbyte;
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@ -129,7 +125,9 @@ static int padzero(unsigned long elf_bss)
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#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
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#define STACK_ROUND(sp, items) \
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((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
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#define STACK_ALLOC(sp, len) ({ elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; old_sp; })
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#define STACK_ALLOC(sp, len) ({ \
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elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
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old_sp; })
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#else
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#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
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#define STACK_ROUND(sp, items) \
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@ -138,7 +136,7 @@ static int padzero(unsigned long elf_bss)
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#endif
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static int
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create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
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create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
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int interp_aout, unsigned long load_addr,
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unsigned long interp_load_addr)
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{
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@ -161,7 +159,6 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
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* for userspace to get any other way, in others (i386) it is
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* merely difficult.
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*/
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u_platform = NULL;
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if (k_platform) {
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size_t len = strlen(k_platform) + 1;
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@ -171,7 +168,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
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* evictions by the processes running on the same package. One
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* thing we can do is to shuffle the initial stack for them.
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*/
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p = arch_align_stack(p);
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u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
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@ -182,7 +179,9 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
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/* Create the ELF interpreter info */
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elf_info = (elf_addr_t *) current->mm->saved_auxv;
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#define NEW_AUX_ENT(id, val) \
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do { elf_info[ei_index++] = id; elf_info[ei_index++] = val; } while (0)
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do { \
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elf_info[ei_index++] = id; elf_info[ei_index++] = val; \
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} while (0)
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#ifdef ARCH_DLINFO
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/*
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@ -195,21 +194,22 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
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NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
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NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
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NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
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NEW_AUX_ENT(AT_PHENT, sizeof (struct elf_phdr));
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NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
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NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
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NEW_AUX_ENT(AT_BASE, interp_load_addr);
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NEW_AUX_ENT(AT_FLAGS, 0);
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NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
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NEW_AUX_ENT(AT_UID, (elf_addr_t) tsk->uid);
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NEW_AUX_ENT(AT_EUID, (elf_addr_t) tsk->euid);
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NEW_AUX_ENT(AT_GID, (elf_addr_t) tsk->gid);
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NEW_AUX_ENT(AT_EGID, (elf_addr_t) tsk->egid);
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NEW_AUX_ENT(AT_SECURE, (elf_addr_t) security_bprm_secureexec(bprm));
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NEW_AUX_ENT(AT_UID, (elf_addr_t)tsk->uid);
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NEW_AUX_ENT(AT_EUID, (elf_addr_t)tsk->euid);
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NEW_AUX_ENT(AT_GID, (elf_addr_t)tsk->gid);
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NEW_AUX_ENT(AT_EGID, (elf_addr_t)tsk->egid);
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NEW_AUX_ENT(AT_SECURE, (elf_addr_t)security_bprm_secureexec(bprm));
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if (k_platform) {
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NEW_AUX_ENT(AT_PLATFORM, (elf_addr_t)(unsigned long)u_platform);
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NEW_AUX_ENT(AT_PLATFORM,
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(elf_addr_t)(unsigned long)u_platform);
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}
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if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
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NEW_AUX_ENT(AT_EXECFD, (elf_addr_t) bprm->interp_data);
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NEW_AUX_ENT(AT_EXECFD, (elf_addr_t)bprm->interp_data);
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}
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#undef NEW_AUX_ENT
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/* AT_NULL is zero; clear the rest too */
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@ -232,7 +232,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
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/* Point sp at the lowest address on the stack */
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#ifdef CONFIG_STACK_GROWSUP
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sp = (elf_addr_t __user *)bprm->p - items - ei_index;
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bprm->exec = (unsigned long) sp; /* XXX: PARISC HACK */
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bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */
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#else
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sp = (elf_addr_t __user *)bprm->p;
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#endif
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@ -285,7 +285,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
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#ifndef elf_map
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static unsigned long elf_map(struct file *filep, unsigned long addr,
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struct elf_phdr *eppnt, int prot, int type)
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struct elf_phdr *eppnt, int prot, int type)
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{
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unsigned long map_addr;
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unsigned long pageoffset = ELF_PAGEOFFSET(eppnt->p_vaddr);
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@ -310,9 +310,8 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
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is only provided so that we can read a.out libraries that have
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an ELF header */
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static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
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struct file * interpreter,
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unsigned long *interp_load_addr)
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static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
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struct file *interpreter, unsigned long *interp_load_addr)
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{
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struct elf_phdr *elf_phdata;
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struct elf_phdr *eppnt;
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@ -342,15 +341,15 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
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goto out;
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/* Now read in all of the header information */
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size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
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if (size > ELF_MIN_ALIGN)
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goto out;
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elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL);
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elf_phdata = kmalloc(size, GFP_KERNEL);
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if (!elf_phdata)
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goto out;
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retval = kernel_read(interpreter,interp_elf_ex->e_phoff,(char *)elf_phdata,size);
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retval = kernel_read(interpreter, interp_elf_ex->e_phoff,
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(char *)elf_phdata,size);
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error = -EIO;
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if (retval != size) {
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if (retval < 0)
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@ -359,58 +358,65 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
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}
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eppnt = elf_phdata;
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for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
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if (eppnt->p_type == PT_LOAD) {
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int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
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int elf_prot = 0;
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unsigned long vaddr = 0;
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unsigned long k, map_addr;
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for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
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if (eppnt->p_type == PT_LOAD) {
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int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
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int elf_prot = 0;
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unsigned long vaddr = 0;
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unsigned long k, map_addr;
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if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
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if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
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if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
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vaddr = eppnt->p_vaddr;
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if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
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elf_type |= MAP_FIXED;
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if (eppnt->p_flags & PF_R)
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elf_prot = PROT_READ;
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if (eppnt->p_flags & PF_W)
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elf_prot |= PROT_WRITE;
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if (eppnt->p_flags & PF_X)
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elf_prot |= PROT_EXEC;
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vaddr = eppnt->p_vaddr;
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if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
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elf_type |= MAP_FIXED;
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map_addr = elf_map(interpreter, load_addr + vaddr, eppnt, elf_prot, elf_type);
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error = map_addr;
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if (BAD_ADDR(map_addr))
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goto out_close;
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map_addr = elf_map(interpreter, load_addr + vaddr,
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eppnt, elf_prot, elf_type);
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error = map_addr;
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if (BAD_ADDR(map_addr))
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goto out_close;
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if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
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load_addr = map_addr - ELF_PAGESTART(vaddr);
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load_addr_set = 1;
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}
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if (!load_addr_set &&
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interp_elf_ex->e_type == ET_DYN) {
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load_addr = map_addr - ELF_PAGESTART(vaddr);
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load_addr_set = 1;
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}
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/*
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* Check to see if the section's size will overflow the
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* allowed task size. Note that p_filesz must always be
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* <= p_memsize so it is only necessary to check p_memsz.
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*/
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k = load_addr + eppnt->p_vaddr;
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if (k > TASK_SIZE || eppnt->p_filesz > eppnt->p_memsz ||
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eppnt->p_memsz > TASK_SIZE || TASK_SIZE - eppnt->p_memsz < k) {
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error = -ENOMEM;
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goto out_close;
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}
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/*
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* Check to see if the section's size will overflow the
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* allowed task size. Note that p_filesz must always be
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* <= p_memsize so it's only necessary to check p_memsz.
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*/
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k = load_addr + eppnt->p_vaddr;
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if (k > TASK_SIZE ||
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eppnt->p_filesz > eppnt->p_memsz ||
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eppnt->p_memsz > TASK_SIZE ||
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TASK_SIZE - eppnt->p_memsz < k) {
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error = -ENOMEM;
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goto out_close;
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}
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/*
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* Find the end of the file mapping for this phdr, and keep
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* track of the largest address we see for this.
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*/
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k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
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if (k > elf_bss)
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elf_bss = k;
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/*
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* Find the end of the file mapping for this phdr, and
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* keep track of the largest address we see for this.
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*/
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k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
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if (k > elf_bss)
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elf_bss = k;
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/*
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* Do the same thing for the memory mapping - between
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* elf_bss and last_bss is the bss section.
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*/
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k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
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if (k > last_bss)
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last_bss = k;
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}
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/*
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* Do the same thing for the memory mapping - between
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* elf_bss and last_bss is the bss section.
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*/
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k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
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if (k > last_bss)
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last_bss = k;
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}
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}
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/*
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@ -424,7 +430,8 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
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goto out_close;
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}
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elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); /* What we have mapped so far */
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/* What we have mapped so far */
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elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
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/* Map the last of the bss segment */
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if (last_bss > elf_bss) {
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@ -436,7 +443,7 @@ static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
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}
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*interp_load_addr = load_addr;
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error = ((unsigned long) interp_elf_ex->e_entry) + load_addr;
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error = ((unsigned long)interp_elf_ex->e_entry) + load_addr;
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out_close:
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kfree(elf_phdata);
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@ -444,8 +451,8 @@ out:
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return error;
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}
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static unsigned long load_aout_interp(struct exec * interp_ex,
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struct file * interpreter)
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static unsigned long load_aout_interp(struct exec *interp_ex,
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struct file *interpreter)
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{
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unsigned long text_data, elf_entry = ~0UL;
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char __user * addr;
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@ -464,7 +471,7 @@ static unsigned long load_aout_interp(struct exec * interp_ex,
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case ZMAGIC:
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case QMAGIC:
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offset = N_TXTOFF(*interp_ex);
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addr = (char __user *) N_TXTADDR(*interp_ex);
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addr = (char __user *)N_TXTADDR(*interp_ex);
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break;
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default:
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goto out;
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|
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@ -480,7 +487,6 @@ static unsigned long load_aout_interp(struct exec * interp_ex,
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flush_icache_range((unsigned long)addr,
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(unsigned long)addr + text_data);
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down_write(¤t->mm->mmap_sem);
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do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
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interp_ex->a_bss);
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@ -519,7 +525,7 @@ static unsigned long randomize_stack_top(unsigned long stack_top)
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#endif
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}
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|
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static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
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static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
|
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{
|
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struct file *interpreter = NULL; /* to shut gcc up */
|
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unsigned long load_addr = 0, load_bias = 0;
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|
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@ -528,7 +534,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
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unsigned int interpreter_type = INTERPRETER_NONE;
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unsigned char ibcs2_interpreter = 0;
|
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unsigned long error;
|
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struct elf_phdr * elf_ppnt, *elf_phdata;
|
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struct elf_phdr *elf_ppnt, *elf_phdata;
|
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unsigned long elf_bss, elf_brk;
|
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int elf_exec_fileno;
|
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int retval, i;
|
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|
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@ -553,7 +559,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
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}
|
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|
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/* Get the exec-header */
|
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loc->elf_ex = *((struct elfhdr *) bprm->buf);
|
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loc->elf_ex = *((struct elfhdr *)bprm->buf);
|
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|
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retval = -ENOEXEC;
|
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/* First of all, some simple consistency checks */
|
||||
|
|
@ -568,7 +574,6 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
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goto out;
|
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|
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/* Now read in all of the header information */
|
||||
|
||||
if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
|
||||
goto out;
|
||||
if (loc->elf_ex.e_phnum < 1 ||
|
||||
|
|
@ -576,18 +581,19 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
goto out;
|
||||
size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr);
|
||||
retval = -ENOMEM;
|
||||
elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL);
|
||||
elf_phdata = kmalloc(size, GFP_KERNEL);
|
||||
if (!elf_phdata)
|
||||
goto out;
|
||||
|
||||
retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, (char *) elf_phdata, size);
|
||||
retval = kernel_read(bprm->file, loc->elf_ex.e_phoff,
|
||||
(char *)elf_phdata, size);
|
||||
if (retval != size) {
|
||||
if (retval >= 0)
|
||||
retval = -EIO;
|
||||
goto out_free_ph;
|
||||
}
|
||||
|
||||
files = current->files; /* Refcounted so ok */
|
||||
files = current->files; /* Refcounted so ok */
|
||||
retval = unshare_files();
|
||||
if (retval < 0)
|
||||
goto out_free_ph;
|
||||
|
|
@ -598,7 +604,6 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
|
||||
/* exec will make our files private anyway, but for the a.out
|
||||
loader stuff we need to do it earlier */
|
||||
|
||||
retval = get_unused_fd();
|
||||
if (retval < 0)
|
||||
goto out_free_fh;
|
||||
|
|
@ -620,7 +625,6 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
* shared libraries - for now assume that this
|
||||
* is an a.out format binary
|
||||
*/
|
||||
|
||||
retval = -ENOEXEC;
|
||||
if (elf_ppnt->p_filesz > PATH_MAX ||
|
||||
elf_ppnt->p_filesz < 2)
|
||||
|
|
@ -628,13 +632,13 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
|
||||
retval = -ENOMEM;
|
||||
elf_interpreter = kmalloc(elf_ppnt->p_filesz,
|
||||
GFP_KERNEL);
|
||||
GFP_KERNEL);
|
||||
if (!elf_interpreter)
|
||||
goto out_free_file;
|
||||
|
||||
retval = kernel_read(bprm->file, elf_ppnt->p_offset,
|
||||
elf_interpreter,
|
||||
elf_ppnt->p_filesz);
|
||||
elf_interpreter,
|
||||
elf_ppnt->p_filesz);
|
||||
if (retval != elf_ppnt->p_filesz) {
|
||||
if (retval >= 0)
|
||||
retval = -EIO;
|
||||
|
|
@ -678,7 +682,8 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
retval = PTR_ERR(interpreter);
|
||||
if (IS_ERR(interpreter))
|
||||
goto out_free_interp;
|
||||
retval = kernel_read(interpreter, 0, bprm->buf, BINPRM_BUF_SIZE);
|
||||
retval = kernel_read(interpreter, 0, bprm->buf,
|
||||
BINPRM_BUF_SIZE);
|
||||
if (retval != BINPRM_BUF_SIZE) {
|
||||
if (retval >= 0)
|
||||
retval = -EIO;
|
||||
|
|
@ -686,8 +691,8 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
}
|
||||
|
||||
/* Get the exec headers */
|
||||
loc->interp_ex = *((struct exec *) bprm->buf);
|
||||
loc->interp_elf_ex = *((struct elfhdr *) bprm->buf);
|
||||
loc->interp_ex = *((struct exec *)bprm->buf);
|
||||
loc->interp_elf_ex = *((struct elfhdr *)bprm->buf);
|
||||
break;
|
||||
}
|
||||
elf_ppnt++;
|
||||
|
|
@ -739,7 +744,6 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
|
||||
/* OK, we are done with that, now set up the arg stuff,
|
||||
and then start this sucker up */
|
||||
|
||||
if ((!bprm->sh_bang) && (interpreter_type == INTERPRETER_AOUT)) {
|
||||
char *passed_p = passed_fileno;
|
||||
sprintf(passed_fileno, "%d", elf_exec_fileno);
|
||||
|
|
@ -777,7 +781,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
if (elf_read_implies_exec(loc->elf_ex, executable_stack))
|
||||
current->personality |= READ_IMPLIES_EXEC;
|
||||
|
||||
if ( !(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
|
||||
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
|
||||
current->flags |= PF_RANDOMIZE;
|
||||
arch_pick_mmap_layout(current->mm);
|
||||
|
||||
|
|
@ -798,8 +802,8 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
the correct location in memory. At this point, we assume that
|
||||
the image should be loaded at fixed address, not at a variable
|
||||
address. */
|
||||
|
||||
for(i = 0, elf_ppnt = elf_phdata; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
|
||||
for(i = 0, elf_ppnt = elf_phdata;
|
||||
i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
|
||||
int elf_prot = 0, elf_flags;
|
||||
unsigned long k, vaddr;
|
||||
|
||||
|
|
@ -827,30 +831,35 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
load_bias, nbyte)) {
|
||||
/*
|
||||
* This bss-zeroing can fail if the ELF
|
||||
* file specifies odd protections. So
|
||||
* file specifies odd protections. So
|
||||
* we don't check the return value
|
||||
*/
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
|
||||
if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
|
||||
if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
|
||||
if (elf_ppnt->p_flags & PF_R)
|
||||
elf_prot |= PROT_READ;
|
||||
if (elf_ppnt->p_flags & PF_W)
|
||||
elf_prot |= PROT_WRITE;
|
||||
if (elf_ppnt->p_flags & PF_X)
|
||||
elf_prot |= PROT_EXEC;
|
||||
|
||||
elf_flags = MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
|
||||
elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
|
||||
|
||||
vaddr = elf_ppnt->p_vaddr;
|
||||
if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
|
||||
elf_flags |= MAP_FIXED;
|
||||
} else if (loc->elf_ex.e_type == ET_DYN) {
|
||||
/* Try and get dynamic programs out of the way of the default mmap
|
||||
base, as well as whatever program they might try to exec. This
|
||||
is because the brk will follow the loader, and is not movable. */
|
||||
/* Try and get dynamic programs out of the way of the
|
||||
* default mmap base, as well as whatever program they
|
||||
* might try to exec. This is because the brk will
|
||||
* follow the loader, and is not movable. */
|
||||
load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
|
||||
}
|
||||
|
||||
error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, elf_prot, elf_flags);
|
||||
error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
|
||||
elf_prot, elf_flags);
|
||||
if (BAD_ADDR(error)) {
|
||||
send_sig(SIGKILL, current, 0);
|
||||
goto out_free_dentry;
|
||||
|
|
@ -867,8 +876,10 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
}
|
||||
}
|
||||
k = elf_ppnt->p_vaddr;
|
||||
if (k < start_code) start_code = k;
|
||||
if (start_data < k) start_data = k;
|
||||
if (k < start_code)
|
||||
start_code = k;
|
||||
if (start_data < k)
|
||||
start_data = k;
|
||||
|
||||
/*
|
||||
* Check to see if the section's size will overflow the
|
||||
|
|
@ -878,7 +889,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
if (k > TASK_SIZE || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
|
||||
elf_ppnt->p_memsz > TASK_SIZE ||
|
||||
TASK_SIZE - elf_ppnt->p_memsz < k) {
|
||||
/* set_brk can never work. Avoid overflows. */
|
||||
/* set_brk can never work. Avoid overflows. */
|
||||
send_sig(SIGKILL, current, 0);
|
||||
goto out_free_dentry;
|
||||
}
|
||||
|
|
@ -966,8 +977,9 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
|
||||
compute_creds(bprm);
|
||||
current->flags &= ~PF_FORKNOEXEC;
|
||||
create_elf_tables(bprm, &loc->elf_ex, (interpreter_type == INTERPRETER_AOUT),
|
||||
load_addr, interp_load_addr);
|
||||
create_elf_tables(bprm, &loc->elf_ex,
|
||||
(interpreter_type == INTERPRETER_AOUT),
|
||||
load_addr, interp_load_addr);
|
||||
/* N.B. passed_fileno might not be initialized? */
|
||||
if (interpreter_type == INTERPRETER_AOUT)
|
||||
current->mm->arg_start += strlen(passed_fileno) + 1;
|
||||
|
|
@ -981,7 +993,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|||
/* Why this, you ask??? Well SVr4 maps page 0 as read-only,
|
||||
and some applications "depend" upon this behavior.
|
||||
Since we do not have the power to recompile these, we
|
||||
emulate the SVr4 behavior. Sigh. */
|
||||
emulate the SVr4 behavior. Sigh. */
|
||||
down_write(¤t->mm->mmap_sem);
|
||||
error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
|
||||
MAP_FIXED | MAP_PRIVATE, 0);
|
||||
|
|
@ -1036,7 +1048,6 @@ out_free_ph:
|
|||
|
||||
/* This is really simpleminded and specialized - we are loading an
|
||||
a.out library that is given an ELF header. */
|
||||
|
||||
static int load_elf_library(struct file *file)
|
||||
{
|
||||
struct elf_phdr *elf_phdata;
|
||||
|
|
@ -1046,7 +1057,7 @@ static int load_elf_library(struct file *file)
|
|||
struct elfhdr elf_ex;
|
||||
|
||||
error = -ENOEXEC;
|
||||
retval = kernel_read(file, 0, (char *) &elf_ex, sizeof(elf_ex));
|
||||
retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
|
||||
if (retval != sizeof(elf_ex))
|
||||
goto out;
|
||||
|
||||
|
|
@ -1055,7 +1066,7 @@ static int load_elf_library(struct file *file)
|
|||
|
||||
/* First of all, some simple consistency checks */
|
||||
if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
|
||||
!elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
|
||||
!elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
|
||||
goto out;
|
||||
|
||||
/* Now read in all of the header information */
|
||||
|
|
@ -1103,7 +1114,8 @@ static int load_elf_library(struct file *file)
|
|||
goto out_free_ph;
|
||||
}
|
||||
|
||||
len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + ELF_MIN_ALIGN - 1);
|
||||
len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
|
||||
ELF_MIN_ALIGN - 1);
|
||||
bss = eppnt->p_memsz + eppnt->p_vaddr;
|
||||
if (bss > len) {
|
||||
down_write(¤t->mm->mmap_sem);
|
||||
|
|
@ -1162,7 +1174,7 @@ static int maydump(struct vm_area_struct *vma)
|
|||
if (vma->vm_flags & (VM_IO | VM_RESERVED))
|
||||
return 0;
|
||||
|
||||
/* Dump shared memory only if mapped from an anonymous file. */
|
||||
/* Dump shared memory only if mapped from an anonymous file. */
|
||||
if (vma->vm_flags & VM_SHARED)
|
||||
return vma->vm_file->f_dentry->d_inode->i_nlink == 0;
|
||||
|
||||
|
|
@ -1173,7 +1185,7 @@ static int maydump(struct vm_area_struct *vma)
|
|||
return 1;
|
||||
}
|
||||
|
||||
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
|
||||
#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
|
||||
|
||||
/* An ELF note in memory */
|
||||
struct memelfnote
|
||||
|
|
@ -1276,11 +1288,11 @@ static void fill_note(struct memelfnote *note, const char *name, int type,
|
|||
}
|
||||
|
||||
/*
|
||||
* fill up all the fields in prstatus from the given task struct, except registers
|
||||
* which need to be filled up separately.
|
||||
* fill up all the fields in prstatus from the given task struct, except
|
||||
* registers which need to be filled up separately.
|
||||
*/
|
||||
static void fill_prstatus(struct elf_prstatus *prstatus,
|
||||
struct task_struct *p, long signr)
|
||||
struct task_struct *p, long signr)
|
||||
{
|
||||
prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
|
||||
prstatus->pr_sigpend = p->pending.signal.sig[0];
|
||||
|
|
@ -1365,8 +1377,8 @@ struct elf_thread_status
|
|||
|
||||
/*
|
||||
* In order to add the specific thread information for the elf file format,
|
||||
* we need to keep a linked list of every threads pr_status and then
|
||||
* create a single section for them in the final core file.
|
||||
* we need to keep a linked list of every threads pr_status and then create
|
||||
* a single section for them in the final core file.
|
||||
*/
|
||||
static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
|
||||
{
|
||||
|
|
@ -1377,19 +1389,23 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
|
|||
fill_prstatus(&t->prstatus, p, signr);
|
||||
elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
|
||||
|
||||
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), &(t->prstatus));
|
||||
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
|
||||
&(t->prstatus));
|
||||
t->num_notes++;
|
||||
sz += notesize(&t->notes[0]);
|
||||
|
||||
if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu))) {
|
||||
fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), &(t->fpu));
|
||||
if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
|
||||
&t->fpu))) {
|
||||
fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
|
||||
&(t->fpu));
|
||||
t->num_notes++;
|
||||
sz += notesize(&t->notes[1]);
|
||||
}
|
||||
|
||||
#ifdef ELF_CORE_COPY_XFPREGS
|
||||
if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
|
||||
fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu), &t->xfpu);
|
||||
fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
|
||||
&t->xfpu);
|
||||
t->num_notes++;
|
||||
sz += notesize(&t->notes[2]);
|
||||
}
|
||||
|
|
@ -1404,7 +1420,7 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
|
|||
* and then they are actually written out. If we run out of core limit
|
||||
* we just truncate.
|
||||
*/
|
||||
static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file)
|
||||
static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file)
|
||||
{
|
||||
#define NUM_NOTES 6
|
||||
int has_dumped = 0;
|
||||
|
|
@ -1433,12 +1449,12 @@ static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file)
|
|||
/*
|
||||
* We no longer stop all VM operations.
|
||||
*
|
||||
* This is because those proceses that could possibly change map_count or
|
||||
* the mmap / vma pages are now blocked in do_exit on current finishing
|
||||
* this core dump.
|
||||
* This is because those proceses that could possibly change map_count
|
||||
* or the mmap / vma pages are now blocked in do_exit on current
|
||||
* finishing this core dump.
|
||||
*
|
||||
* Only ptrace can touch these memory addresses, but it doesn't change
|
||||
* the map_count or the pages allocated. So no possibility of crashing
|
||||
* the map_count or the pages allocated. So no possibility of crashing
|
||||
* exists while dumping the mm->vm_next areas to the core file.
|
||||
*/
|
||||
|
||||
|
|
@ -1500,7 +1516,7 @@ static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file)
|
|||
#endif
|
||||
|
||||
/* Set up header */
|
||||
fill_elf_header(elf, segs+1); /* including notes section */
|
||||
fill_elf_header(elf, segs + 1); /* including notes section */
|
||||
|
||||
has_dumped = 1;
|
||||
current->flags |= PF_DUMPCORE;
|
||||
|
|
@ -1510,24 +1526,24 @@ static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file)
|
|||
* with info from their /proc.
|
||||
*/
|
||||
|
||||
fill_note(notes +0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
|
||||
|
||||
fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
|
||||
fill_psinfo(psinfo, current->group_leader, current->mm);
|
||||
fill_note(notes +1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
|
||||
fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
|
||||
|
||||
numnote = 2;
|
||||
|
||||
auxv = (elf_addr_t *) current->mm->saved_auxv;
|
||||
auxv = (elf_addr_t *)current->mm->saved_auxv;
|
||||
|
||||
i = 0;
|
||||
do
|
||||
i += 2;
|
||||
while (auxv[i - 2] != AT_NULL);
|
||||
fill_note(¬es[numnote++], "CORE", NT_AUXV,
|
||||
i * sizeof (elf_addr_t), auxv);
|
||||
i * sizeof(elf_addr_t), auxv);
|
||||
|
||||
/* Try to dump the FPU. */
|
||||
if ((prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, fpu)))
|
||||
if ((prstatus->pr_fpvalid =
|
||||
elf_core_copy_task_fpregs(current, regs, fpu)))
|
||||
fill_note(notes + numnote++,
|
||||
"CORE", NT_PRFPREG, sizeof(*fpu), fpu);
|
||||
#ifdef ELF_CORE_COPY_XFPREGS
|
||||
|
|
@ -1576,8 +1592,10 @@ static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file)
|
|||
phdr.p_memsz = sz;
|
||||
offset += phdr.p_filesz;
|
||||
phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
|
||||
if (vma->vm_flags & VM_WRITE) phdr.p_flags |= PF_W;
|
||||
if (vma->vm_flags & VM_EXEC) phdr.p_flags |= PF_X;
|
||||
if (vma->vm_flags & VM_WRITE)
|
||||
phdr.p_flags |= PF_W;
|
||||
if (vma->vm_flags & VM_EXEC)
|
||||
phdr.p_flags |= PF_X;
|
||||
phdr.p_align = ELF_EXEC_PAGESIZE;
|
||||
|
||||
DUMP_WRITE(&phdr, sizeof(phdr));
|
||||
|
|
@ -1594,7 +1612,9 @@ static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file)
|
|||
|
||||
/* write out the thread status notes section */
|
||||
list_for_each(t, &thread_list) {
|
||||
struct elf_thread_status *tmp = list_entry(t, struct elf_thread_status, list);
|
||||
struct elf_thread_status *tmp =
|
||||
list_entry(t, struct elf_thread_status, list);
|
||||
|
||||
for (i = 0; i < tmp->num_notes; i++)
|
||||
if (!writenote(&tmp->notes[i], file))
|
||||
goto end_coredump;
|
||||
|
|
@ -1611,18 +1631,19 @@ static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file)
|
|||
for (addr = vma->vm_start;
|
||||
addr < vma->vm_end;
|
||||
addr += PAGE_SIZE) {
|
||||
struct page* page;
|
||||
struct page *page;
|
||||
struct vm_area_struct *vma;
|
||||
|
||||
if (get_user_pages(current, current->mm, addr, 1, 0, 1,
|
||||
&page, &vma) <= 0) {
|
||||
DUMP_SEEK (file->f_pos + PAGE_SIZE);
|
||||
DUMP_SEEK(file->f_pos + PAGE_SIZE);
|
||||
} else {
|
||||
if (page == ZERO_PAGE(addr)) {
|
||||
DUMP_SEEK (file->f_pos + PAGE_SIZE);
|
||||
DUMP_SEEK(file->f_pos + PAGE_SIZE);
|
||||
} else {
|
||||
void *kaddr;
|
||||
flush_cache_page(vma, addr, page_to_pfn(page));
|
||||
flush_cache_page(vma, addr,
|
||||
page_to_pfn(page));
|
||||
kaddr = kmap(page);
|
||||
if ((size += PAGE_SIZE) > limit ||
|
||||
!dump_write(file, kaddr,
|
||||
|
|
@ -1644,7 +1665,8 @@ static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file)
|
|||
|
||||
if ((off_t)file->f_pos != offset) {
|
||||
/* Sanity check */
|
||||
printk(KERN_WARNING "elf_core_dump: file->f_pos (%ld) != offset (%ld)\n",
|
||||
printk(KERN_WARNING
|
||||
"elf_core_dump: file->f_pos (%ld) != offset (%ld)\n",
|
||||
(off_t)file->f_pos, offset);
|
||||
}
|
||||
|
||||
|
|
|
|||
Reference in New Issue