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c5f69fde26
The asm audit optimizations are ugly and obfuscate the code too much. Remove them. This will regress performance if syscall auditing is enabled on 32-bit kernels and SYSENTER is in use. If this becomes a problem, interested parties are encouraged to implement the equivalent of the 64-bit opportunistic SYSRET optimization. Alternatively, a case could be made that, on 32-bit kernels, a less messy asm audit optimization could be done. 32-bit kernels don't have the complicated partial register saving tricks that 64-bit kernels have, so the SYSENTER post-syscall path could just call the audit hooks directly. Any reimplementation of this ought to demonstrate that it only calls the audit hook once per syscall, though, which does not currently appear to be true. Someone would have to make the case that doing so would be better than implementing opportunistic SYSEXIT, though. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eric Paris <eparis@parisplace.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/212be39dd8c90b44c4b7bbc678128d6b88bdb9912.1438378274.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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