From: Thiébaud Weksteen <tweek@google.com> stable inclusion from stable-v6.6.70 commit c1dbd28a079553de0023e1c938c713efeeee400f category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBJ6OD CVE: CVE-2024-57931 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 900f83cf376bdaf798b6f5dcb2eae0c822e908b6 upstream. When evaluating extended permissions, ignore unknown permissions instead of calling BUG(). This commit ensures that future permissions can be added without interfering with older kernels. Cc: stable@vger.kernel.org Fixes: fa1aa143ac4a ("selinux: extended permissions for ioctls") Signed-off-by: Thiébaud Weksteen <tweek@google.com> Signed-off-by: Paul Moore <paul@paul-moore.com> Acked-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: GONG Ruiqi <gongruiqi1@huawei.com> --- security/selinux/ss/services.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 379ac7b5c709..f5eead8af2e2 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -956,7 +956,10 @@ void services_compute_xperms_decision(struct extended_perms_decision *xpermd, xpermd->driver)) return; } else { - BUG(); + pr_warn_once( + "SELinux: unknown extended permission (%u) will be ignored\n", + node->datum.u.xperms->specified); + return; } if (node->key.specified == AVTAB_XPERMS_ALLOWED) { @@ -993,7 +996,8 @@ void services_compute_xperms_decision(struct extended_perms_decision *xpermd, node->datum.u.xperms->perms.p[i]; } } else { - BUG(); + pr_warn_once("SELinux: unknown specified key (%u)\n", + node->key.specified); } } -- 2.25.1