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13 August 2024, 17:29:01 UTC
Revision 8fb2dfb228df785bbeb4d055a74402ef4b07fc25 authored by Alexander Popov on 06 December 2018, 15:13:07 UTC, committed by Kees Cook on 06 December 2018, 17:10:23 UTC 
stackleak: Register the 'stackleak_cleanup' pass before the '*free_cfg' pass
 
Currently the 'stackleak_cleanup' pass deleting a CALL insn is executed
after the 'reload' pass. That allows gcc to do some weird optimization in
function prologues and epilogues, which are generated later [1].

Let's avoid that by registering the 'stackleak_cleanup' pass before
the '*free_cfg' pass. It's the moment when the stack frame size is
already final, function prologues and epilogues are generated, and the
machine-dependent code transformations are not done.

[1] https://www.openwall.com/lists/kernel-hardening/2018/11/23/2

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Alexander Popov <alex.popov@linux.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
1 parent e9c7d65
History
Tip revision: 8fb2dfb228df785bbeb4d055a74402ef4b07fc25 authored by Alexander Popov on 06 December 2018, 15:13:07 UTC
stackleak: Register the 'stackleak_cleanup' pass before the '*free_cfg' pass
Tip revision: 8fb2dfb
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