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authorDavid Daney <ddaney@caviumnetworks.com>2010-11-01 17:43:07 -0700
committerRalf Baechle <ralf@linux-mips.org>2010-12-16 18:10:54 +0000
commit1c0d52b9b5e6ca277c13d6fece9c34ed3159423d (patch)
tree81ffb96ca45de9cdeff0bae2759c1b220d87f1be /arch/mips/include
parent1d210386f6ef9000b1cd723cf453c5eb0377e722 (diff)
MIPS: Don't clobber personality high bits.
The high bits of current->personality carry settings that we don't want to clobber on each exec. Only clobber them if the lower bits that indicate either PER_LINUX or PER_LINUX32 are invalid. The clobbering prevents us from using useful bits like ADDR_NO_RANDOMIZE. Reported-by: Camm Maguire <camm@maguirefamily.org> Signed-off-by: David Daney <ddaney@caviumnetworks.com> Cc: Camm Maguire <camm@maguirefamily.org> Patchwork: https://patchwork.linux-mips.org/patch/1750/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include')
-rw-r--r--arch/mips/include/asm/elf.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/mips/include/asm/elf.h b/arch/mips/include/asm/elf.h
index fd1d39eb743..455c0ac7d4e 100644
--- a/arch/mips/include/asm/elf.h
+++ b/arch/mips/include/asm/elf.h
@@ -249,7 +249,8 @@ extern struct mips_abi mips_abi_n32;
#define SET_PERSONALITY(ex) \
do { \
- set_personality(PER_LINUX); \
+ if (personality(current->personality) != PER_LINUX) \
+ set_personality(PER_LINUX); \
\
current->thread.abi = &mips_abi; \
} while (0)
@@ -296,6 +297,8 @@ do { \
#define SET_PERSONALITY(ex) \
do { \
+ unsigned int p; \
+ \
clear_thread_flag(TIF_32BIT_REGS); \
clear_thread_flag(TIF_32BIT_ADDR); \
\
@@ -304,7 +307,8 @@ do { \
else \
current->thread.abi = &mips_abi; \
\
- if (current->personality != PER_LINUX32) \
+ p = personality(current->personality); \
+ if (p != PER_LINUX32 && p != PER_LINUX) \
set_personality(PER_LINUX); \
} while (0)