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17 May 2024, 09:02:56 UTC
Revision 7ca0758cdb7c241cb4e0490a8d95f0eb5b861daf authored by H. Peter Anvin on 22 August 2011, 20:27:06 UTC, committed by H. Peter Anvin on 23 August 2011, 23:20:10 UTC 
x86-32, vdso: On system call restart after SYSENTER, use int $0x80
 
When we enter a 32-bit system call via SYSENTER or SYSCALL, we shuffle
the arguments to match the int $0x80 calling convention.  This was
probably a design mistake, but it's what it is now.  This causes
errors if the system call as to be restarted.

For SYSENTER, we have to invoke the instruction from the vdso as the
return address is hardcoded.  Accordingly, we can simply replace the
jump in the vdso with an int $0x80 instruction and use the slower
entry point for a post-restart.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/CA%2B55aFztZ=r5wa0x26KJQxvZOaQq8s2v3u50wCyJcA-Sc4g8gQ@mail.gmail.com
Cc: <stable@kernel.org>
1 parent 05e33fc
History
Tip revision: 7ca0758cdb7c241cb4e0490a8d95f0eb5b861daf authored by H. Peter Anvin on 22 August 2011, 20:27:06 UTC
x86-32, vdso: On system call restart after SYSENTER, use int $0x80
Tip revision: 7ca0758
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