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[PARISC] fix user-triggerable panic on parisc 

int sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, compat_sigset_t __user *oset,
                                    unsigned int sigsetsize)
{
        sigset_t old_set, new_set;
        int ret;

        if (set && get_sigset32(set, &new_set, sigsetsize))

...
static int
get_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz)
{
        compat_sigset_t s;
        int r;

        if (sz != sizeof *set) panic("put_sigset32()");

In other words, rt_sigprocmask(69, (void *)69, 69) done by 32bit process
will promptly panic the box.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Al Viro 2012-11-21 19:27:23 +00:00 committed by James Bottomley
parent 949a05d034
commit 441a179daf
1 changed files with 4 additions and 2 deletions
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6
arch/parisc/kernel/signal32.c
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@ -65,7 +65,8 @@ put_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz)
{
compat_sigset_t s;
if (sz != sizeof *set) panic("put_sigset32()");
if (sz != sizeof *set)
return -EINVAL;
sigset_64to32(&s, set);
return copy_to_user(up, &s, sizeof s);
@ -77,7 +78,8 @@ get_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz)
compat_sigset_t s;
int r;
if (sz != sizeof *set) panic("put_sigset32()");
if (sz != sizeof *set)
return -EINVAL;
if ((r = copy_from_user(&s, up, sz)) == 0) {
sigset_32to64(set, &s);