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[PATCH] uml: fix strace -f

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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>
This commit is contained in:
Jeff Dike 2005-06-08 15:48:13 -07:00 committed by Linus Torvalds
parent da00d9a546
commit 501cb02b43
1 changed files with 6 additions and 1 deletions
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7
arch/um/kernel/skas/process_kern.c
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@ -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);
}