From: Alexei Starovoitov Date: Wed, 28 Dec 2022 22:11:48 +0000 (-0800) Subject: Merge branch 'bpf: fix the crash caused by task iterators over vma' X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=f90dd663c492124b53bb28db6ff85b50c80ccc32;p=users%2Fjedix%2Flinux-maple.git Merge branch 'bpf: fix the crash caused by task iterators over vma' Kui-Feng Lee says: ==================== This issue is related to task iterators over vma. A system crash can occur when a task iterator travels through vma of tasks as the death of a task will clear the pointer to its mm, even though the task_struct is still held. As a result, an unexpected crash happens due to a null pointer. To address this problem, a reference to mm is kept on the iterator to make sure that the pointer is always valid. This patch set provides a solution for this crash by properly referencing mm on task iterators over vma. The major changes from v1 are: - Fix commit logs of the test case. - Use reverse Christmas tree coding style. - Remove unnecessary error handling for time(). v1: https://lore.kernel.org/bpf/20221216015912.991616-1-kuifeng@meta.com/ ==================== Signed-off-by: Alexei Starovoitov --- f90dd663c492124b53bb28db6ff85b50c80ccc32