diff options
| author | Adrian Bunk <bunk@stusta.de> | 2011-10-05 17:40:47 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-10-11 02:23:34 -0400 |
| commit | 2b666859ec323403ac9a3a441d16eab30945404b (patch) | |
| tree | a2db4a7fc4cc386deda62584379713fa5a5d6bbb /Documentation | |
| parent | 65112dccf8a113737684366349d7f9ec373ddc47 (diff) | |
x86: Default to vsyscall=native for now
This UML breakage:
linux-2.6.30.1[3800] vsyscall fault (exploit attempt?) ip:ffffffffff600000 cs:33 sp:7fbfb9c498 ax:ffffffffff600000 si:0 di:606790
linux-2.6.30.1[3856] vsyscall fault (exploit attempt?) ip:ffffffffff600000 cs:33 sp:7fbfb13168 ax:ffffffffff600000 si:0 di:606790
Is caused by commit 3ae36655 ("x86-64: Rework vsyscall emulation and add
vsyscall= parameter") - the vsyscall emulation code is not fully cooked
yet as UML relies on some rather fragile SIGSEGV semantics.
Linus suggested in https://lkml.org/lkml/2011/8/9/376 to default
to vsyscall=native for now, this patch implements that.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Andrew Lutomirski <luto@mit.edu>
Cc: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/20111005214047.GE14406@localhost.pp.htv.fi
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 7 |
1 files changed, 4 insertions, 3 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. | |||
| 2706 | functions are at fixed addresses, they make nice | 2706 | functions are at fixed addresses, they make nice |
| 2707 | targets for exploits that can control RIP. | 2707 | targets for exploits that can control RIP. |
| 2708 | 2708 | ||
| 2709 | emulate [default] Vsyscalls turn into traps and are | 2709 | emulate Vsyscalls turn into traps and are emulated |
| 2710 | emulated reasonably safely. | 2710 | reasonably safely. |
| 2711 | 2711 | ||
| 2712 | native Vsyscalls are native syscall instructions. | 2712 | native [default] Vsyscalls are native syscall |
| 2713 | instructions. | ||
| 2713 | This is a little bit faster than trapping | 2714 | This is a little bit faster than trapping |
| 2714 | and makes a few dynamic recompilers work | 2715 | and makes a few dynamic recompilers work |
| 2715 | better than they would in emulation mode. | 2716 | better than they would in emulation mode. |