From patchwork Mon Aug 13 13:18:28 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [RESEND] powerpc: fix personality handling in ppc64_personality() From: Jiri Kosina X-Patchwork-Id: 176938 Message-Id: To: Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Andreas Schwab Date: Mon, 13 Aug 2012 15:18:28 +0200 (CEST) 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 --- 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