[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 <jdike@addtoit.com>
Cc: <stable@kernel.org>
Cc: Adrian Bunk <bunk@stusta.de>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Antoine Martin <antoine@nagafix.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c
index 0709fc6..3f6acd6 100644 (file)
--- 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;

diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c
index 9edf114..af2f017 100644 (file)
--- a/arch/um/sys-x86_64/signal.c
+++ b/arch/um/sys-x86_64/signal.c
@@ -191,8 +191,9 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
        struct task_struct *me = current;
 
        frame = (struct rt_sigframe __user *)
-               round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8;
-        frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128);
+               round_down(stack_top - sizeof(struct rt_sigframe), 16);
+       /* Subtract 128 for a red zone and 8 for proper alignment */
+        frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
 
        if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate)))
                goto out;