Commit 501cb02b authored Jun 08, 2005 by Jeff Dike Committed by Linus Torvalds Jun 08, 2005

[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>

parent da00d9a5

arch/um/kernel/skas/process_kern.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -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);
		}