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authorAl Viro <viro@zeniv.linux.org.uk>2010-10-03 01:15:49 -0400
committerGeert Uytterhoeven <geert@linux-m68k.org>2011-01-07 14:01:34 +0100
commitf85741eb5fb2653fd9138b4bef68396615c720f7 (patch)
treecf57bfb2816c43ab7bc832ce1535b92000b20af0 /arch/m68k
parent9e4930dbf17c1eba72631cd52a0c621da3d1a816 (diff)
downloadop-kernel-dev-f85741eb5fb2653fd9138b4bef68396615c720f7.zip
op-kernel-dev-f85741eb5fb2653fd9138b4bef68396615c720f7.tar.gz
m68k: Don't lose state if sigframe setup fails
If we'd failed in setup_frame(), we've no place to store the original sigmask. It's not an unrecoverable situation - we raise SIGSEGV, but that SIGSEGV might be successfully handled (e.g. on altstack). In that case we really don't want sa_mask of original signal permanently slapped on the set of blocked signals. Standard solution: have setup_frame()/setup_rt_frame() report failure and don't mess with the signal-related state if that has happened... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k')
-rw-r--r--arch/m68k/kernel/signal.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index a18b251..a6dd614 100644
--- a/arch/m68k/kernel/signal.c
+++ b/arch/m68k/kernel/signal.c
@@ -743,7 +743,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
return (void __user *)((usp - frame_size) & -8UL);
}
-static void setup_frame (int sig, struct k_sigaction *ka,
+static int setup_frame (int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs *regs)
{
struct sigframe __user *frame;
@@ -813,14 +813,14 @@ adjust_stack:
tregs->pc = regs->pc;
tregs->sr = regs->sr;
}
- return;
+ return err;
give_sigsegv:
force_sigsegv(sig, current);
goto adjust_stack;
}
-static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
+static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
@@ -901,7 +901,7 @@ adjust_stack:
tregs->pc = regs->pc;
tregs->sr = regs->sr;
}
- return;
+ return err;
give_sigsegv:
force_sigsegv(sig, current);
@@ -963,6 +963,7 @@ static void
handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs)
{
+ int err;
/* are we from a system call? */
if (regs->orig_d0 >= 0)
/* If so, check system call restarting.. */
@@ -970,9 +971,12 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
/* set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
- setup_rt_frame(sig, ka, info, oldset, regs);
+ err = setup_rt_frame(sig, ka, info, oldset, regs);
else
- setup_frame(sig, ka, oldset, regs);
+ err = setup_frame(sig, ka, oldset, regs);
+
+ if (err)
+ return;
sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NODEFER))
@@ -983,6 +987,8 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
regs->sr &= ~0x8000;
send_sig(SIGTRAP, current, 1);
}
+
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
}
/*
@@ -1008,7 +1014,6 @@ asmlinkage void do_signal(struct pt_regs *regs)
if (signr > 0) {
/* Whee! Actually deliver the signal. */
handle_signal(signr, &ka, &info, oldset, regs);
- clear_thread_flag(TIF_RESTORE_SIGMASK);
return;
}
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