From: Mickaël Salaün mic@digikod.net

mainline inclusion from mainline-v6.10-rc1 commit f8aa1b98ce40184521ed95ec26cc115a255183b2 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6SDW CVE: CVE-2024-38561

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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There is a race condition when a kthread finishes after the deadline and before the call to kthread_stop(), which may lead to use after free.

Cc: Brendan Higgins brendanhiggins@google.com Cc: Shuah Khan skhan@linuxfoundation.org Reviewed-by: Kees Cook keescook@chromium.org Fixes: adf505457032 ("kunit: fix UAF when run kfence test case test_gfpzero") Reviewed-by: David Gow davidgow@google.com Reviewed-by: Rae Moar rmoar@google.com Signed-off-by: Mickaël Salaün mic@digikod.net Link: https://lore.kernel.org/r/20240408074625.65017-3-mic@digikod.net Signed-off-by: Shuah Khan skhan@linuxfoundation.org

Conflicts: lib/kunit/try-catch.c [Context conflicts] Signed-off-by: ZhangPeng zhangpeng362@huawei.com --- lib/kunit/try-catch.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c index d7b3fe4d5f24..e82ca9d68ded 100644 --- a/lib/kunit/try-catch.c +++ b/lib/kunit/try-catch.c @@ -11,6 +11,7 @@ #include <linux/completion.h> #include <linux/kernel.h> #include <linux/kthread.h> +#include <linux/sched/task.h>

#include "try-catch-impl.h"

@@ -65,13 +66,14 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context) try_catch->context = context; try_catch->try_completion = &try_completion; try_catch->try_result = 0; - task_struct = kthread_run(kunit_generic_run_threadfn_adapter, - try_catch, - "kunit_try_catch_thread"); + task_struct = kthread_create(kunit_generic_run_threadfn_adapter, + try_catch, "kunit_try_catch_thread"); if (IS_ERR(task_struct)) { try_catch->catch(try_catch->context); return; } + get_task_struct(task_struct); + wake_up_process(task_struct);

time_remaining = wait_for_completion_timeout(&try_completion, kunit_test_timeout()); @@ -81,6 +83,7 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context) kthread_stop(task_struct); }

+ put_task_struct(task_struct); exit_code = try_catch->try_result;

if (!exit_code)