diff options
author | Josh Poimboeuf <[email protected]> | 2016-03-09 00:06:51 -0600 |
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committer | Ingo Molnar <[email protected]> | 2016-03-09 10:48:07 +0100 |
commit | 81bfafca1332869160e9da789252276e2f34a14e (patch) | |
tree | cc0b22ee496b790abefdb6fd9b12d6df3311ed42 /tools/perf/scripts/python/syscall-counts-by-pid.py | |
parent | 3b27a0c85d7068130ed8e3977a2e977ade986841 (diff) |
objtool: Prevent infinite recursion in noreturn detection
Ingo reported an infinite loop in objtool with a certain randconfig [1].
With the given config, two functions in crypto/ablkcipher.o contained
sibling calls to each other, which threw the recursive call in
dead_end_function() for a loop (literally!).
Split the noreturn detection into two passes. In the first pass, check
for return instructions. In the second pass, do the potentially
recursive sibling call check. In most cases, the first pass will be
good enough. In the rare case where a second pass is needed, recursion
should hopefully no longer be possible.
[1] https://lkml.kernel.org/r/[email protected]
Reported-by: Ingo Molnar <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Bernd Petrovitsch <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Chris J Arges <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Michal Marek <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Pedro Alves <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/16afb602640ef43b7782087d6cca17bf6fc13603.1457502970.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts-by-pid.py')
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