[POWERPC] Implement logging of unhandled signals
Implement show_unhandled_signals sysctl + support to print when a process
is killed due to unhandled signals just as i386 and x86_64 does.
Default to having it off, unlike x86 that defaults on.
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 590057e..6126bca 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -705,11 +705,13 @@
{
struct rt_sigframe __user *rt_sf;
struct mcontext __user *frame;
+ void __user *addr;
unsigned long newsp = 0;
/* Set up Signal Frame */
/* Put a Real Time Context onto stack */
rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf));
+ addr = rt_sf;
if (unlikely(rt_sf == NULL))
goto badframe;
@@ -728,6 +730,7 @@
/* Save user registers on the stack */
frame = &rt_sf->uc.uc_mcontext;
+ addr = frame;
if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
if (save_user_regs(regs, frame, 0))
goto badframe;
@@ -742,6 +745,7 @@
/* create a stack frame for the caller of the handler */
newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
+ addr = (void __user *)regs->gpr[1];
if (put_user(regs->gpr[1], (u32 __user *)newsp))
goto badframe;
@@ -762,6 +766,12 @@
printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
regs, frame, newsp);
#endif
+ if (show_unhandled_signals && printk_ratelimit())
+ printk(KERN_INFO "%s[%d]: bad frame in handle_rt_signal32: "
+ "%p nip %08lx lr %08lx\n",
+ current->comm, current->pid,
+ addr, regs->nip, regs->link);
+
force_sigsegv(sig, current);
return 0;
}
@@ -886,6 +896,12 @@
return 0;
bad:
+ if (show_unhandled_signals && printk_ratelimit())
+ printk(KERN_INFO "%s[%d]: bad frame in sys_rt_sigreturn: "
+ "%p nip %08lx lr %08lx\n",
+ current->comm, current->pid,
+ rt_sf, regs->nip, regs->link);
+
force_sig(SIGSEGV, current);
return 0;
}
@@ -967,6 +983,13 @@
* We kill the task with a SIGSEGV in this situation.
*/
if (do_setcontext(ctx, regs, 1)) {
+ if (show_unhandled_signals && printk_ratelimit())
+ printk(KERN_INFO "%s[%d]: bad frame in "
+ "sys_debug_setcontext: %p nip %08lx "
+ "lr %08lx\n",
+ current->comm, current->pid,
+ ctx, regs->nip, regs->link);
+
force_sig(SIGSEGV, current);
goto out;
}
@@ -1048,6 +1071,12 @@
printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
regs, frame, newsp);
#endif
+ if (show_unhandled_signals && printk_ratelimit())
+ printk(KERN_INFO "%s[%d]: bad frame in handle_signal32: "
+ "%p nip %08lx lr %08lx\n",
+ current->comm, current->pid,
+ frame, regs->nip, regs->link);
+
force_sigsegv(sig, current);
return 0;
}
@@ -1061,12 +1090,14 @@
struct sigcontext __user *sc;
struct sigcontext sigctx;
struct mcontext __user *sr;
+ void __user *addr;
sigset_t set;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
+ addr = sc;
if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
goto badframe;
@@ -1083,6 +1114,7 @@
restore_sigmask(&set);
sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
+ addr = sr;
if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
|| restore_user_regs(regs, sr, 1))
goto badframe;
@@ -1091,6 +1123,12 @@
return 0;
badframe:
+ if (show_unhandled_signals && printk_ratelimit())
+ printk(KERN_INFO "%s[%d]: bad frame in sys_sigreturn: "
+ "%p nip %08lx lr %08lx\n",
+ current->comm, current->pid,
+ addr, regs->nip, regs->link);
+
force_sig(SIGSEGV, current);
return 0;
}