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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-14 16:54:56 +1200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-14 16:54:56 +1200 |
| commit | 2ad53110d654c7c9a80dcea341f4117246c1b6f9 (patch) | |
| tree | 90dac284bd4e08d408a0730fc507389779677b10 | |
| parent | 153b19a3b9fd8b9478495b9ee1f93f6a77c564f9 (diff) | |
| parent | 2b666859ec323403ac9a3a441d16eab30945404b (diff) | |
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.txt | 7 | ||||
| -rw-r--r-- | arch/x86/kernel/vsyscall_64.c | 2 |
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) { |