This is a note to let you know that I've just added the patch titled
selftests/x86: Do not rely on "int $0x80" in test_mremap_vdso.c
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2cbc0d66de0480449c75636f55697c7ff3af61fc Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
Date: Sun, 11 Feb 2018 12:10:11 +0100
Subject: selftests/x86: Do not rely on "int $0x80" in test_mremap_vdso.c
From: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
commit 2cbc0d66de0480449c75636f55697c7ff3af61fc upstream.
On 64-bit builds, we should not rely on "int $0x80" working (it only does if
CONFIG_IA32_EMULATION=y is enabled).
Without this patch, the move test may succeed, but the "int $0x80" causes
a segfault, resulting in a false negative output of this self-test.
Signed-off-by: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Dmitry Safonov <dsafonov@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Cc: shuah@xxxxxxxxxx
Link: http://lkml.kernel.org/r/20180211111013.16888-4-linux@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/x86/test_mremap_vdso.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/tools/testing/selftests/x86/test_mremap_vdso.c
+++ b/tools/testing/selftests/x86/test_mremap_vdso.c
@@ -90,8 +90,12 @@ int main(int argc, char **argv, char **e
vdso_size += PAGE_SIZE;
}
+#ifdef __i386__
/* Glibc is likely to explode now - exit with raw syscall */
asm volatile ("int $0x80" : : "a" (__NR_exit), "b" (!!ret));
+#else /* __x86_64__ */
+ syscall(SYS_exit, ret);
+#endif
} else {
int status;
Patches currently in stable-queue which might be from linux@xxxxxxxxxxxxxxxxxxxx are
queue-4.9/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.9/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch