linux-kernel - [PATCH] [RESEND] powerpc: fix personality handling in ppc64

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <alpine.LNX.2.00.1208131515550.29827@pobox.suse.cz>
Date:	Mon, 13 Aug 2012 15:18:28 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Andreas Schwab <schwab@...ux-m68k.org>
Subject: [PATCH] [RESEND] powerpc: fix personality handling in
 ppc64_personality()

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

Use personality() macro to compare only PER_MASK bytes and make sure that 
we are setting only the bits that should be set, instead of overwriting 
the whole value.

Signed-off-by: Jiri Kosina <jkosina@...e.cz>
---

Resned of patch sent on Thu, 2 Aug 2012 09:10:03 +0200 (CEST)

 arch/powerpc/kernel/syscalls.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
index f2496f2..dc1558e 100644
--- a/arch/powerpc/kernel/syscalls.c
+++ b/arch/powerpc/kernel/syscalls.c
@@ -107,11 +107,11 @@ long ppc64_personality(unsigned long personality)
 	long ret;
 
 	if (personality(current->personality) == PER_LINUX32
-	    && personality == PER_LINUX)
-		personality = PER_LINUX32;
+	    && personality(personality) == PER_LINUX)
+		personality = (personality & ~PER_MASK) | PER_LINUX32;
 	ret = sys_personality(personality);
-	if (ret == PER_LINUX32)
-		ret = PER_LINUX;
+	if (personality(ret) == PER_LINUX32)
+		ret = (ret & ~PER_MASK) | PER_LINUX;
 	return ret;
 }
 #endif

-- 
Jiri Kosina
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/