diff options
| author | Will Deacon <will.deacon@arm.com> | 2019-01-03 20:45:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-09 19:38:49 +0300 |
| commit | 920735c63d8a44c664f0967721a0081f60d37fb0 (patch) | |
| tree | 4abe1ca102223c4bdc9e1d55a38fca062b0561ef /arch/arm64/include/asm | |
| parent | 1817b2ccbd11cbbe64a3d38972ef924d9334d912 (diff) | |
| download | linux-920735c63d8a44c664f0967721a0081f60d37fb0.tar.xz | |
arm64: compat: Avoid sending SIGILL for unallocated syscall numbers
commit 169113ece0f29ebe884a6cfcf57c1ace04d8a36a upstream.
The ARM Linux kernel handles the EABI syscall numbers as follows:
0 - NR_SYSCALLS-1 : Invoke syscall via syscall table
NR_SYSCALLS - 0xeffff : -ENOSYS (to be allocated in future)
0xf0000 - 0xf07ff : Private syscall or -ENOSYS if not allocated
> 0xf07ff : SIGILL
Our compat code gets this wrong and ends up sending SIGILL in response
to all syscalls greater than NR_SYSCALLS which have a value greater
than 0x7ff in the bottom 16 bits.
Fix this by defining the end of the ARM private syscall region and
checking the syscall number against that directly. Update the comment
while we're at it.
Cc: <stable@vger.kernel.org>
Cc: Dave Martin <Dave.Martin@arm.com>
Reported-by: Pi-Hsun Shih <pihsun@chromium.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64/include/asm')
| -rw-r--r-- | arch/arm64/include/asm/unistd.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h index e0d0f5b856e7..d52051879ffe 100644 --- a/arch/arm64/include/asm/unistd.h +++ b/arch/arm64/include/asm/unistd.h @@ -40,8 +40,9 @@ * The following SVCs are ARM private. */ #define __ARM_NR_COMPAT_BASE 0x0f0000 -#define __ARM_NR_compat_cacheflush (__ARM_NR_COMPAT_BASE+2) -#define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE+5) +#define __ARM_NR_compat_cacheflush (__ARM_NR_COMPAT_BASE + 2) +#define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE + 5) +#define __ARM_NR_COMPAT_END (__ARM_NR_COMPAT_BASE + 0x800) #define __NR_compat_syscalls 399 #endif |