Patchwork [3.5.y.z,extended,stable] Patch "sparc64: do not clobber personality flags in" has been added to staging queue

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Submitter Herton Ronaldo Krzesinski
Date Dec. 12, 2012, 5:09 a.m.
Message ID <1355288961-29464-1-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/205383/
State New
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Comments

Herton Ronaldo Krzesinski - Dec. 12, 2012, 5:09 a.m.
This is a note to let you know that I have just added a patch titled

    sparc64: do not clobber personality flags in

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

From ca02cf849bf8d056fff8c6a51635aa9c91b24465 Mon Sep 17 00:00:00 2001
From: Jiri Kosina <jkosina@suse.cz>
Date: Wed, 1 Aug 2012 21:10:51 +0200
Subject: [PATCH] sparc64: do not clobber personality flags in
 sys_sparc64_personality()

commit a27032eee8cb6e16516f13c8a9752e9d5d4cc430 upstream.

There are multiple errors in how sys_sparc64_personality() handles
personality flags stored in top three bytes.

- directly comparing current->personality against PER_LINUX32 doesn't work
  in cases when any of the personality flags stored in the top three bytes
  are used.
- directly forcefully setting personality to PER_LINUX32 or PER_LINUX
  discards any flags stored in the top three bytes

Fix the first one by properly using personality() macro to compare only
PER_MASK bytes.
Fix the second one by setting only the bits that should be set, instead of
overwriting the whole value.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 arch/sparc/kernel/sys_sparc_64.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--
1.7.9.5

Patch

diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index 275f74f..3c38914 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -519,12 +519,12 @@  SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 {
 	int ret;

-	if (current->personality == PER_LINUX32 &&
-	    personality == PER_LINUX)
-		personality = PER_LINUX32;
+	if (personality(current->personality) == PER_LINUX32 &&
+	    personality(personality) == PER_LINUX)
+		personality |= PER_LINUX32;
 	ret = sys_personality(personality);
-	if (ret == PER_LINUX32)
-		ret = PER_LINUX;
+	if (personality(ret) == PER_LINUX32)
+		ret &= ~PER_LINUX32;

 	return ret;
 }