From 3896625d0badd53dbc34d584861a36ba7eb4613f Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Tue, 30 Jan 2007 14:36:17 -0800 Subject: [PATCH] uml: fix signal frame alignment Use the same signal frame alignment calculations as the underlying architecture. x86_64 appeared to do this, but the "- 8" was really subtracting 8 * sizeof(struct rt_sigframe) rather than 8 bytes. UML/i386 might have been OK, but I changed the calculation to match i386 just to be sure. Signed-off-by: Jeff Dike Cc: Cc: Adrian Bunk Cc: Paolo 'Blaisorblade' Giarrusso Acked-by: Antoine Martin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/sys-i386/signal.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/um/sys-i386') diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c index 0709fc6670c2..3f6acd667717 100644 --- a/arch/um/sys-i386/signal.c +++ b/arch/um/sys-i386/signal.c @@ -219,7 +219,8 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig, unsigned long save_sp = PT_REGS_SP(regs); int err = 0; - stack_top &= -8UL; + /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */ + stack_top = ((stack_top + 4) & -16UL) - 4; frame = (struct sigframe __user *) stack_top - 1; if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) return 1; -- cgit v1.2.3