| From | Greg Kroah-Hartman <> | Subject | [ 20/56] PARISC: fix user-triggerable panic on parisc | Date | Fri, 30 Nov 2012 10:55:12 -0800 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Al Viro <viro@ZenIV.linux.org.uk>
commit 441a179dafc0f99fc8b3a8268eef66958621082e upstream.
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> Signed-off-by: James Bottomley <JBottomley@Parallels.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/parisc/kernel/signal32.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/arch/parisc/kernel/signal32.c +++ b/arch/parisc/kernel/signal32.c @@ -67,7 +67,8 @@ put_sigset32(compat_sigset_t __user *up, { 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); @@ -79,7 +80,8 @@ get_sigset32(compat_sigset_t __user *up, 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);
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