linux-kernel - [PATCH] ARM64:Fix MINSIGSTKSZ and SIGSTKSZ

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Date:	Mon, 05 Oct 2015 15:26:09 +0530
From:	Manjeet Pawar <manjeet.p@...sung.com>
To:	arnd@...db.de, linux-arch@...r.kernel.org,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	pankaj.m@...sung.com, Manjeet Pawar <manjeet.p@...sung.com>,
	Akhilesh Kumar <akhilesh.k@...sung.com>,
	Rohit Thapliyal <r.thapliyal@...sung.com>
Subject: [PATCH] ARM64:Fix MINSIGSTKSZ and SIGSTKSZ

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:
https://sourceware.org/bugzilla/show_bug.cgi?id=16850

Bugfix in Glibc-2.22:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=blob;f=sysdeps/unix/
sysv/linux/aarch64/bits/sigstack.h;h=8f2fb76e3e81734ef8a9cf9ae40daf4705
f31c35;hb=b763f6ae859ecea70a5dacb8ad45c71d5f667e2e

Signed-off-by: Akhilesh Kumar <akhilesh.k@...sung.com>
Signed-off-by: Manjeet Pawar <manjeet.p@...sung.com>
Signed-off-by: Rohit Thapliyal <r.thapliyal@...sung.com>
---
 include/uapi/asm-generic/signal.h |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/uapi/asm-generic/signal.h b/include/uapi/asm-generic/signal.h
index 9df61f1..2ffbe38 100644
--- a/include/uapi/asm-generic/signal.h
+++ b/include/uapi/asm-generic/signal.h
@@ -80,8 +80,13 @@
  *	SA_RESTORER	0x04000000
  */
 
-#define MINSIGSTKSZ	2048
-#define SIGSTKSZ	8192
+#ifdef CONFIG_ARM64
+#define MINSIGSTKSZ 5120
+#define SIGSTKSZ    16384
+#else
+#define MINSIGSTKSZ 2048
+#define SIGSTKSZ    8192
+#endif
 
 #ifndef __ASSEMBLY__
 typedef struct {
-- 
1.7.1

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