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authorAndy Lutomirski <luto@amacapital.net>2011-11-07 16:33:41 -0800
committerIngo Molnar <mingo@elte.hu>2011-12-05 12:17:29 +0100
commit2e57ae0515124af45dd889bfbd4840fd40fcc07d (patch)
tree9c11c35755f8c09555faaa92399b6bf4096bcbdd /Documentation/kernel-parameters.txt
parent4fc3490114bb159bd4fff1b3c96f4320fe6fb08f (diff)
x86: Default to vsyscall=emulate
This essentially reverts: 2b666859ec32: x86: Default to vsyscall=native for now The ABI breakage should now be fixed by: commit 48c4206f5b02f28c4c78a1f5b491d3772fb64fb9 Author: Andy Lutomirski <luto@mit.edu> Date: Thu Oct 20 08:48:19 2011 -0700 x86-64: Set siginfo and context on vsyscall emulation faults Signed-off-by: Andy Lutomirski <luto@amacapital.net> Cc: richard -rw- weinberger <richard.weinberger@gmail.com> Cc: Adrian Bunk <bunk@stusta.de> Cc: H. Peter Anvin <hpa@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/93154af3b2b6d208906ae02d80d92cf60c6fa94f.1320712291.git.luto@amacapital.net Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt7
1 files changed, 3 insertions, 4 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index a0c5c5f4fce..ce7fc8b3e2c 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2750,11 +2750,10 @@ 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 Vsyscalls turn into traps and are emulated
- reasonably safely.
+ emulate [default] Vsyscalls turn into traps and are
+ emulated reasonably safely.
- native [default] Vsyscalls are native syscall
- instructions.
+ native 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.