diff options
| author | Christopher M. Riedl <cmr@codefail.de> | 2021-02-26 19:12:59 -0600 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 12:52:24 +1100 |
| commit | d3ccc9781560af051554017c702631560bdc0811 (patch) | |
| tree | 3b6184e4a3457313d93a968f4b27474294143349 /arch/powerpc/kernel/signal.h | |
| parent | 0f92433b8f9f76608528101e7a81cd3bfd00e236 (diff) | |
powerpc/signal: Use __get_user() to copy sigset_t
Usually sigset_t is exactly 8B which is a "trivial" size and does not
warrant using __copy_from_user(). Use __get_user() directly in
anticipation of future work to remove the trivial size optimizations
from __copy_from_user().
The ppc32 implementation of get_sigset_t() previously called
copy_from_user() which, unlike __copy_from_user(), calls access_ok().
Replacing this w/ __get_user() (no access_ok()) is fine here since both
callsites in signal_32.c are preceded by an earlier access_ok().
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210227011259.11992-11-cmr@codefail.de
Diffstat (limited to 'arch/powerpc/kernel/signal.h')
| -rw-r--r-- | arch/powerpc/kernel/signal.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h index d8dd76b1dc94..1393876f3814 100644 --- a/arch/powerpc/kernel/signal.h +++ b/arch/powerpc/kernel/signal.h @@ -19,6 +19,13 @@ extern int handle_signal32(struct ksignal *ksig, sigset_t *oldset, extern int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset, struct task_struct *tsk); +static inline int __get_user_sigset(sigset_t *dst, const sigset_t __user *src) +{ + BUILD_BUG_ON(sizeof(sigset_t) != sizeof(u64)); + + return __get_user(dst->sig[0], (u64 __user *)&src->sig[0]); +} + #ifdef CONFIG_VSX extern unsigned long copy_vsx_to_user(void __user *to, struct task_struct *task); |