Jeff Dike 508a92741a uml: fix irqstack crash ... This patch fixes a crash caused by an interrupt coming in when an IRQ stack is being torn down. When this happens, handle_signal will loop, setting up the IRQ stack again because the tearing down had finished, and handling whatever signals had come in. However, to_irq_stack returns a mask of pending signals to be handled, plus bit zero is set if the IRQ stack was already active, and thus shouldn't be torn down. This causes a problem because when handle_signal goes around the loop, sig will be zero, and to_irq_stack will duly set bit zero in the returned mask, faking handle_signal into believing that it shouldn't tear down the IRQ stack and return thread_info pointers back to their original values. This will eventually cause a crash, as the IRQ stack thread_info will continue pointing to the original task_struct and an interrupt will look into it after it has been freed. The fix is to stop passing a signal number into to_irq_stack. Rather, the pending signals mask is initialized beforehand with the bit for sig already set. References to sig in to_irq_stack can be replaced with references to the mask. [akpm@linux-foundation.org: use UL] Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2007-09-19 11:24:18 -07:00
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skas
tt
asm-offsets.c
config.c.in
dyn.lds.S
exec.c
exitcode.c
gmon_syms.c
gprof_syms.c
init_task.c
initrd.c
irq.c
ksyms.c
Makefile
mem.c
physmem.c
process.c
ptrace.c
reboot.c
sigio.c
signal.c
smp.c
syscall.c
sysrq.c
time.c
tlb.c
trap.c
uaccess.c
um_arch.c
umid.c
uml.lds.S
vmlinux.lds.S