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| author | Oleg Nesterov <oleg@redhat.com> | 2016-05-23 16:24:02 -0700 |
|---|---|---|
| committer | Seung-Woo Kim <sw0312.kim@samsung.com> | 2016-12-14 13:51:07 +0900 |
| commit | 94d539b3d0615094f1a86160da82c50798528508 (patch) | |
| tree | 75163ee2377cac491df1865ecf699651bbeb0a91 /include | |
| parent | 72d2a974e0ed7b30480762551639f603f06b62b3 (diff) | |
| download | linux-exynos-94d539b3d0615094f1a86160da82c50798528508.tar.gz linux-exynos-94d539b3d0615094f1a86160da82c50798528508.tar.bz2 linux-exynos-94d539b3d0615094f1a86160da82c50798528508.zip | |
signal: move the "sig < SIGRTMIN" check into siginmask(sig)
All the users of siginmask() must ensure that sig < SIGRTMIN. sig_fatal()
doesn't and this is wrong:
UBSAN: Undefined behaviour in kernel/signal.c:911:6
shift exponent 32 is too large for 32-bit type 'long unsigned int'
the patch doesn't add the neccesary check to sig_fatal(), it moves the
check into siginmask() and updates other callers.
Link: http://lkml.kernel.org/r/20160517195052.GA15187@redhat.com
Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[Backport from mainline to remove UBSAN warning in sending signal]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: Icb12de70772b563ba112f5f6e490731e4db119d1
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/signal.h | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/include/linux/signal.h b/include/linux/signal.h index 883ceb1439fa..4f5bb3d2ce18 100644 --- a/include/linux/signal.h +++ b/include/linux/signal.h @@ -401,7 +401,9 @@ int unhandled_signal(struct task_struct *tsk, int sig); #else #define rt_sigmask(sig) sigmask(sig) #endif -#define siginmask(sig, mask) (rt_sigmask(sig) & (mask)) + +#define siginmask(sig, mask) \ + ((sig) < SIGRTMIN && (rt_sigmask(sig) & (mask))) #define SIG_KERNEL_ONLY_MASK (\ rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP)) @@ -422,14 +424,10 @@ int unhandled_signal(struct task_struct *tsk, int sig); rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \ rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) ) -#define sig_kernel_only(sig) \ - (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK)) -#define sig_kernel_coredump(sig) \ - (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK)) -#define sig_kernel_ignore(sig) \ - (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK)) -#define sig_kernel_stop(sig) \ - (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK)) +#define sig_kernel_only(sig) siginmask(sig, SIG_KERNEL_ONLY_MASK) +#define sig_kernel_coredump(sig) siginmask(sig, SIG_KERNEL_COREDUMP_MASK) +#define sig_kernel_ignore(sig) siginmask(sig, SIG_KERNEL_IGNORE_MASK) +#define sig_kernel_stop(sig) siginmask(sig, SIG_KERNEL_STOP_MASK) #define sig_user_defined(t, signr) \ (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \ |