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| author | Andy Lutomirski <luto@kernel.org> | 2016-03-23 00:24:46 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-23 01:36:02 +0300 |
| commit | 069923d87e97a26d5f4ee2d53829f2d3cd05294b (patch) | |
| tree | d39d5bf65d75410821be53897d9f2d643df5defa /arch | |
| parent | 5180e3e24fd3e8e7ea46fbe21e10f5ea3fb1edaa (diff) | |
| download | linux-069923d87e97a26d5f4ee2d53829f2d3cd05294b.tar.xz | |
sparc/compat: provide an accurate in_compat_syscall implementation
On sparc64 compat-enabled kernels, any task can make 32-bit and 64-bit
syscalls. is_compat_task returns true in 32-bit tasks, which does not
necessarily imply that the current syscall is 32-bit.
Provide an in_compat_syscall implementation that checks whether the
current syscall is compat.
As far as I know, sparc is the only architecture on which is_compat_task
checks the compat status of the task and on which the compat status of a
syscall can differ from the compat status of the task. On x86,
is_compat_task checks the syscall type, not the task type.
[akpm@linux-foundation.org: add comment, per Sam]
[akpm@linux-foundation.org: update comment, per Andy]
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/include/asm/compat.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h index 830502fe62b4..6f251c4d613e 100644 --- a/arch/sparc/include/asm/compat.h +++ b/arch/sparc/include/asm/compat.h @@ -307,4 +307,11 @@ static inline int is_compat_task(void) return test_thread_flag(TIF_32BIT); } +static inline bool in_compat_syscall(void) +{ + /* Vector 0x110 is LINUX_32BIT_SYSCALL_TRAP */ + return pt_regs_trap_type(current_pt_regs()) == 0x110; +} +#define in_compat_syscall in_compat_syscall + #endif /* _ASM_SPARC64_COMPAT_H */ |