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authorJeff Dike <jdike@addtoit.com>2005-06-08 15:48:13 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-08 16:21:12 -0700
commit501cb02b431fb88c7f157c46c8b54de59d1dd463 (patch)
treee41592306301f7bbd727466ca1a4b4b0f93751cf /arch/um/kernel
parentda00d9a5466558ccd9e7b7d04b13d7cb9160c876 (diff)
[PATCH] uml: fix strace -f
It turns out that we need to check for pending signals when a newly forked process is run for the first time. With strace -f, strace needs to know about the forked process before it gets going. If it doesn't, then it ptraces some bogus values into its registers, and the process segfaults. So, I added calls to interrupt_end, which does that, plus checks for reschedules. There shouldn't be any of those, but x86 does the same thing, so I'm copying that behavior to be safe. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/kernel')
-rw-r--r--arch/um/kernel/skas/process_kern.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/um/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c
index ab5d3271da0..fc71ef29578 100644
--- a/arch/um/kernel/skas/process_kern.c
+++ b/arch/um/kernel/skas/process_kern.c
@@ -68,8 +68,11 @@ void new_thread_handler(int sig)
* 0 if it just exits
*/
n = run_kernel_thread(fn, arg, &current->thread.exec_buf);
- if(n == 1)
+ if(n == 1){
+ /* Handle any immediate reschedules or signals */
+ interrupt_end();
userspace(&current->thread.regs.regs);
+ }
else do_exit(0);
}
@@ -96,6 +99,8 @@ void fork_handler(int sig)
schedule_tail(current->thread.prev_sched);
current->thread.prev_sched = NULL;
+ /* Handle any immediate reschedules or signals */
+ interrupt_end();
userspace(&current->thread.regs.regs);
}