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x86: Default to vsyscall=native for now

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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 <[email protected]>
Acked-by: Andrew Lutomirski <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Adrian Bunk 2011-10-06 00:40:47 +03:00 • committed by Ingo Molnar
commit 2b666859ec
2 changed files with 5 additions and 4 deletions
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7
Documentation/kernel-parameters.txt
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@ -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.