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Subject[PATCH v2 38/43] xtensa: Don't mask signals if we fail to setup signal stack
Date
From: Matt Fleming <matt.fleming@intel.com>

setup_frame() needs to return an indication of whether it succeeded or
failed in setting up the signal stack frame. If setup_frame() fails
then we must not modify current->blocked.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
arch/xtensa/kernel/signal.c | 11 +++++++----
1 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index 24655e3..17ceab8 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -336,8 +336,8 @@ gen_return_code(unsigned char *codemem)
}


-static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
+static int setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe *frame;
int err = 0;
@@ -422,10 +422,11 @@ static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
current->comm, current->pid, signal, frame, regs->pc);
#endif

- return;
+ return 0;

give_sigsegv:
force_sigsegv(sig, current);
+ return -EFAULT;
}

/*
@@ -534,7 +535,9 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)

/* Whee! Actually deliver the signal. */
/* Set up the stack frame */
- setup_frame(signr, &ka, &info, oldset, regs);
+ ret = setup_frame(signr, &ka, &info, oldset, regs);
+ if (ret)
+ return ret;

spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked, &current->blocked, &ka.sa.sa_mask);
--
1.7.4.4


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