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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-09-20 16:38:34 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-11-28 21:46:11 -0500 |
| commit | 9dc87c7b5b0a2db407e086f45cf08ca78208cc16 (patch) | |
| tree | ae445ffb58167e7d83d79c17107dfaa98040fead /arch/sh | |
| parent | d26654e5f9cd27815ab5bc8148c826f3b960396c (diff) | |
| download | linux-9dc87c7b5b0a2db407e086f45cf08ca78208cc16.tar.bz2 | |
sh64: fix altstack switching on sigreturn
incidentally, declaring a local variable as __user (!) to make
sparse STFU is really sick. Especially since sparse had been
100% right - it *is* a bug.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/sh')
| -rw-r--r-- | arch/sh/kernel/signal_64.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c index 23853814bd17..d867cd95a622 100644 --- a/arch/sh/kernel/signal_64.c +++ b/arch/sh/kernel/signal_64.c @@ -347,7 +347,6 @@ asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3, { struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP; sigset_t set; - stack_t __user st; long long ret; /* Always make any pending restarted system calls return -EINTR */ @@ -365,11 +364,10 @@ asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3, goto badframe; regs->pc -= 4; - if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) - goto badframe; /* It is more difficult to avoid calling this function than to call it and ignore errors. */ - do_sigaltstack(&st, NULL, REF_REG_SP); + if (do_sigaltstack(&frame->uc.uc_stack, NULL, REF_REG_SP) == -EFAULT) + goto badframe; return (int) ret; |