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9a7449d3e9
Al Viro noted that CRIS fails to handle multiple signals.
This fixes the problem for CRISv32 by making it use a C work_pending
handling loop similar to the ARM implementation in 0a267fa6a15d41c
("ARM: 7472/1: pull all work_pending logics into C function").
This also happens to fixes the warnings which currently trigger on
CRISv32 due to do_signal() being called with interrupts disabled.
Test case (should die of the SIGSEGV which gets raised when setting up
the stack for SIGALRM, but instead reaches and executes the _exit(1)):
#include <unistd.h>
#include <signal.h>
#include <sys/time.h>
#include <err.h>
static void handler(int sig) { }
int main(int argc, char *argv[])
{
int ret;
struct itimerval t1 = { .it_value = {1} };
stack_t ss = {
.ss_sp = NULL,
.ss_size = SIGSTKSZ,
};
struct sigaction action = {
.sa_handler = handler,
.sa_flags = SA_ONSTACK,
};
ret = sigaltstack(&ss, NULL);
if (ret < 0)
err(1, "sigaltstack");
sigaction(SIGALRM, &action, NULL);
setitimer(ITIMER_REAL, &t1, NULL);
pause();
_exit(1);
return 0;
}
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Link: http://lkml.kernel.org/r/20121208074429.GC4939@ZenIV.linux.org.uk
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Jesper Nilsson <jespern@axis.com>
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/*
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* linux/arch/cris/kernel/ptrace.c
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*
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* Parts taken from the m68k port.
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*
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* Copyright (c) 2000, 2001, 2002 Axis Communications AB
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*
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* Authors: Bjorn Wesen
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*
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/tracehook.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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/* notification of userspace execution resumption
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* - triggered by current->work.notify_resume
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*/
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extern int do_signal(int canrestart, struct pt_regs *regs);
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void do_notify_resume(int canrestart, struct pt_regs *regs,
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__u32 thread_info_flags)
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{
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/* deal with pending signal delivery */
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if (thread_info_flags & _TIF_SIGPENDING)
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do_signal(canrestart,regs);
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if (thread_info_flags & _TIF_NOTIFY_RESUME) {
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clear_thread_flag(TIF_NOTIFY_RESUME);
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tracehook_notify_resume(regs);
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}
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}
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void do_work_pending(int syscall, struct pt_regs *regs,
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unsigned int thread_flags)
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{
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do {
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if (likely(thread_flags & _TIF_NEED_RESCHED)) {
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schedule();
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} else {
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if (unlikely(!user_mode(regs)))
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return;
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local_irq_enable();
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if (thread_flags & _TIF_SIGPENDING) {
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do_signal(syscall, regs);
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syscall = 0;
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} else {
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clear_thread_flag(TIF_NOTIFY_RESUME);
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tracehook_notify_resume(regs);
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}
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}
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local_irq_disable();
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thread_flags = current_thread_info()->flags;
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} while (thread_flags & _TIF_WORK_MASK);
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}
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