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kernel: make kcov_common_handle consider the current context 

kcov_common_handle is a method that is used to obtain a "default" KCOV
remote handle of the current process. The handle can later be passed
to kcov_remote_start in order to collect coverage for the processing
that is initiated by one process, but done in another. For details see
Documentation/dev-tools/kcov.rst and comments in kernel/kcov.c.

Presently, if kcov_common_handle is called in an IRQ context, it will
return a handle for the interrupted process. This may lead to
unreliable and incorrect coverage collection.

Adjust the behavior of kcov_common_handle in the following way. If it
is called in a task context, return the common handle for the
currently running task. Otherwise, return 0.

Signed-off-by: Aleksandr Nogikh <nogikh@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
zero-sugar-mainline-defconfig
Aleksandr Nogikh 2020-10-29 17:36:18 +00:00 committed by Jakub Kicinski
parent 0e8c266c59
commit b08e84da20
1 changed files with 2 additions and 0 deletions
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kernel/kcov.c
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@ -1023,6 +1023,8 @@ EXPORT_SYMBOL(kcov_remote_stop);
/* See the comment before kcov_remote_start() for usage details. */
u64 kcov_common_handle(void)
{
if (!in_task())
return 0;
return current->kcov_handle;
}
EXPORT_SYMBOL(kcov_common_handle);