From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Anton Blanchard , Eric Paris Subject: [ 031/102] audit: Syscall rules are not applied to existing processes on non-x86 Date: Fri, 17 May 2013 14:35:46 -0700 Message-Id: <20130517213247.606470798@linuxfoundation.org> In-Reply-To: <20130517213244.277411019@linuxfoundation.org> References: <20130517213244.277411019@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Anton Blanchard commit cdee3904b4ce7c03d1013ed6dd704b43ae7fc2e9 upstream. Commit b05d8447e782 (audit: inline audit_syscall_entry to reduce burden on archs) changed audit_syscall_entry to check for a dummy context before calling __audit_syscall_entry. Unfortunately the dummy context state is maintained in __audit_syscall_entry so once set it never gets cleared, even if the audit rules change. As a result, if there are no auditing rules when a process starts then it will never be subject to any rules added later. x86 doesn't see this because it has an assembly fast path that calls directly into __audit_syscall_entry. I noticed this issue when working on audit performance optimisations. I wrote a set of simple test cases available at: http://ozlabs.org/~anton/junkcode/audit_tests.tar.gz 02_new_rule.py fails without the patch and passes with it. The test case clears all rules, starts a process, adds a rule then verifies the process produces a syscall audit record. Signed-off-by: Anton Blanchard Signed-off-by: Eric Paris Signed-off-by: Greg Kroah-Hartman --- include/linux/audit.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -120,7 +120,7 @@ static inline void audit_syscall_entry(i unsigned long a1, unsigned long a2, unsigned long a3) { - if (unlikely(!audit_dummy_context())) + if (unlikely(current->audit_context)) __audit_syscall_entry(arch, major, a0, a1, a2, a3); } static inline void audit_syscall_exit(void *pt_regs)