From: Xia Fukun <xiafukun@huawei.com> stable inclusion from stable-v5.10.165 commit 9f8e45720e0e7edb661d0082422f662ed243d8d8 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I6Z6SU?from=project-issue CVE: CVE-2023-0458 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=l... -------------------------------- [ Upstream commit 739790605705ddcf18f21782b9c99ad7d53a8c11 ] do_prlimit() adds the user-controlled resource value to a pointer that will subsequently be dereferenced. In order to help prevent this codepath from being used as a spectre "gadget" a barrier needs to be added after checking the range. Reported-by: Jordy Zomer <jordyzomer@google.com> Tested-by: Jordy Zomer <jordyzomer@google.com> Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Xia Fukun <xiafukun@huawei.com> Reviewed-by: Zhang Qiao <zhangqiao22@huawei.com> Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com> Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> --- kernel/sys.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sys.c b/kernel/sys.c index 10c5a6d2acdc..402940b89336 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1548,6 +1548,8 @@ int do_prlimit(struct task_struct *tsk, unsigned int resource, if (resource >= RLIM_NLIMITS) return -EINVAL; + resource = array_index_nospec(resource, RLIM_NLIMITS); + if (new_rlim) { if (new_rlim->rlim_cur > new_rlim->rlim_max) return -EINVAL; -- 2.25.1