From: Jiri Kosina Date: Wed, 1 Aug 2012 19:10:51 +0000 (+0200) Subject: sparc64: do not clobber personality flags in sys_sparc64_personality() X-Git-Tag: firefly_0821_release~7541^2~418 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6c2bbdc7f87008e15161cb5cbbb49c1292e906e2;p=firefly-linux-kernel-4.4.55.git sparc64: do not clobber personality flags in sys_sparc64_personality() [ Upstream commit a27032eee8cb6e16516f13c8a9752e9d5d4cc430 ] 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 Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c index 908b47a5ee24..10c9b369169c 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; }