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authorCongyu Liu <liu3101@purdue.edu>2022-05-23 05:35:31 +0000
committerakpm <akpm@linux-foundation.org>2022-05-25 13:05:42 -0700
commit3159d79b56c15068aeb7e4630cd5f6dacd20fda4 (patch)
treea95d34e119be4f89bf4211f546675382e5468483 /fs
parent863e0d81b6683c4cbc588ad831f560c90e494bef (diff)
kcov: update pos before writing pc in trace function
In __sanitizer_cov_trace_pc(), previously we write pc before updating pos. However, some early interrupt code could bypass check_kcov_mode() check and invoke __sanitizer_cov_trace_pc(). If such interrupt is raised between writing pc and updating pos, the pc could be overitten by the recursive __sanitizer_cov_trace_pc(). As suggested by Dmitry, we cold update pos before writing pc to avoid such interleaving. Apply the same change to write_comp_data(). Link: https://lkml.kernel.org/r/20220523053531.1572793-1-liu3101@purdue.edu Signed-off-by: Congyu Liu <liu3101@purdue.edu> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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