[PATCHv3] ARM64:Fix MINSIGSTKSZ and SIGSTKSZ

Manjeet Pawar
2015-10-09T10:30:19Z

MINSIGSTKSZ and SIGSTKSZ for ARM64 are not correctly set in latest kernel.
This patch fixes this issue.

This issue is reported in LTP (testcase: sigaltstack02.c).
Testcase failed when sigaltstack() called with stack size "MINSIGSTKSZ - 1"
Since in Glibc-2.22, MINSIGSTKSZ is set to 5120 but in kernel
it is set to 2048 so testcase gets failed.

Testcase Output:
sigaltstack02 1 TPASS : stgaltstack() fails, Invalid Flag value,errno:22
sigaltstack02 2 TFAIL : sigaltstack() returned 0, expected -1,errno:12

Reported Issue in Glibc Bugzilla:
Bugfix in Glibc-2.22: [Bug 16850]
https://sourceware.org/bugzilla/show_bug.cgi?id=16850

Signed-off-by: Akhilesh Kumar <akhilesh.k@samsung.com>
Signed-off-by: Manjeet Pawar <manjeet.p@samsung.com>
Signed-off-by: Rohit Thapliyal <r.thapliyal@samsung.com>
---
v1 -> Changes in uapi overall header
v2 -> Changes done in arm64 headers
v3 -> Changes done in both uapi & arm64 headers

arch/arm64/include/uapi/asm/signal.h | 3 +++
include/uapi/asm-generic/signal.h | 2 ++
2 files changed, 5 insertions(+)

diff --git a/arch/arm64/include/uapi/asm/signal.h b/arch/arm64/include/uapi/asm/signal.h
index 8d1e723..991bf5d 100644
--- a/arch/arm64/include/uapi/asm/signal.h
+++ b/arch/arm64/include/uapi/asm/signal.h
@@ -19,6 +19,9 @@
/* Required for AArch32 compatibility. */
#define SA_RESTORER 0x04000000

+#define MINSIGSTKSZ 5120
+#define SIGSTKSZ 16384
+
#include <asm-generic/signal.h>

#endif
diff --git a/include/uapi/asm-generic/signal.h b/include/uapi/asm-generic/signal.h
index 9df61f1..b98b67b 100644
--- a/include/uapi/asm-generic/signal.h
+++ b/include/uapi/asm-generic/signal.h
@@ -80,8 +80,10 @@
* SA_RESTORER 0x04000000
*/

+#if !defined MINSIGSTKSZ || !defined SIGSTKSZ
#define MINSIGSTKSZ 2048
#define SIGSTKSZ 8192
+#endif

#ifndef __ASSEMBLY__
typedef struct {
--
1.7.9.5