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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-05-03 01:45:12 (GMT) |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-10-01 13:58:10 (GMT) |
| commit | bfc83647bbbb2aaf748a582ed7d45fb1408d4671 (patch) | |
| tree | b4685834725a134f0826d7ec6f3234e7964b4aaa | |
| parent | cf880248c56495a5e616cde226d7c85972a3218c (diff) | |
| download | linux-bfc83647bbbb2aaf748a582ed7d45fb1408d4671.tar.xz | |
mips: prevent hitting do_notify_resume() with !user_mode(regs)
too late to do anything there...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | arch/mips/kernel/entry.S | 3 | ||||
| -rw-r--r-- | arch/mips/kernel/signal.c | 8 |
2 files changed, 3 insertions, 8 deletions
diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S index 37acfa0..4b0937f 100644 --- a/arch/mips/kernel/entry.S +++ b/arch/mips/kernel/entry.S @@ -167,6 +167,9 @@ work_notifysig: # deal with pending signals and FEXPORT(syscall_exit_work_partial) SAVE_STATIC syscall_exit_work: + LONG_L t0, PT_STATUS(sp) # returning to kernel mode? + andi t0, t0, KU_USER + beqz t0, resume_kernel li t0, _TIF_WORK_SYSCALL_EXIT and t0, a2 # a2 is preloaded with TI_FLAGS beqz t0, work_pending # trace bit set? diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index f2c09cf..0e1a5b8 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -560,14 +560,6 @@ static void do_signal(struct pt_regs *regs) siginfo_t info; int signr; - /* - * We want the common case to go fast, which is why we may in certain - * cases get here from kernel mode. Just return without doing anything - * if so. - */ - if (!user_mode(regs)) - return; - signr = get_signal_to_deliver(&info, &ka, regs, NULL); if (signr > 0) { /* Whee! Actually deliver the signal. */ |