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authorLinus Torvalds <torvalds@linux-foundation.org>2011-10-14 16:54:56 +1200
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-14 16:54:56 +1200
commit2ad53110d654c7c9a80dcea341f4117246c1b6f9 (patch)
tree90dac284bd4e08d408a0730fc507389779677b10
parent153b19a3b9fd8b9478495b9ee1f93f6a77c564f9 (diff)
parent2b666859ec323403ac9a3a441d16eab30945404b (diff)
downloadlinux-linaro-stable-2ad53110d654c7c9a80dcea341f4117246c1b6f9.tar.gz
Merge branch 'x86-urgent-for-linus' of git://tesla.tglx.de/git/linux-2.6-tip
* 'x86-urgent-for-linus' of git://tesla.tglx.de/git/linux-2.6-tip: x86: Default to vsyscall=native for now
-rw-r--r--Documentation/kernel-parameters.txt7
-rw-r--r--arch/x86/kernel/vsyscall_64.c2
2 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 854ed5ca7e3f..d6e6724446c8 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2706,10 +2706,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
functions are at fixed addresses, they make nice
targets for exploits that can control RIP.
- emulate [default] Vsyscalls turn into traps and are
- emulated reasonably safely.
+ emulate Vsyscalls turn into traps and are emulated
+ reasonably safely.
- native Vsyscalls are native syscall instructions.
+ native [default] Vsyscalls are native syscall
+ instructions.
This is a little bit faster than trapping
and makes a few dynamic recompilers work
better than they would in emulation mode.
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index 18ae83dd1cd7..b56c65de384d 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -56,7 +56,7 @@ DEFINE_VVAR(struct vsyscall_gtod_data, vsyscall_gtod_data) =
.lock = __SEQLOCK_UNLOCKED(__vsyscall_gtod_data.lock),
};
-static enum { EMULATE, NATIVE, NONE } vsyscall_mode = EMULATE;
+static enum { EMULATE, NATIVE, NONE } vsyscall_mode = NATIVE;
static int __init vsyscall_setup(char *str)
{