From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= Subject: [PATCH v1 1/3] um/ptrace: Fix the syscall_trace_leave call Date: Mon, 11 Jul 2016 23:57:00 +0200 Message-Id: <1468274222-31726-2-git-send-email-mic@digikod.net> In-Reply-To: <1468274222-31726-1-git-send-email-mic@digikod.net> References: <1468274222-31726-1-git-send-email-mic@digikod.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= , Kees Cook , Jeff Dike , Richard Weinberger , James Morris , Olof Johansson , user-mode-linux-devel@lists.sourceforge.net, linux-security-module@vger.kernel.org List-ID: Keep the same semantic as before the commit 26703c636c1f: deallocate audit context and fake a proper syscall exit. This fix a kernel panic triggered by the seccomp_bpf test: > [ RUN ] global.ERRNO_valid > BUG: failure at kernel/auditsc.c:1504/__audit_syscall_entry()! > Kernel panic - not syncing: BUG! Fixes: 26703c636c1f ("um/ptrace: run seccomp after ptrace") Signed-off-by: Mickaël Salaün Cc: Kees Cook Cc: Jeff Dike Cc: Richard Weinberger Cc: James Morris Cc: user-mode-linux-devel@lists.sourceforge.net --- arch/um/kernel/skas/syscall.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c index ef4b8f949b51..0728fee94398 100644 --- a/arch/um/kernel/skas/syscall.c +++ b/arch/um/kernel/skas/syscall.c @@ -21,11 +21,11 @@ void handle_syscall(struct uml_pt_regs *r) PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS); if (syscall_trace_enter(regs)) - return; + goto out; /* Do the seccomp check after ptrace; failures should be fast. */ if (secure_computing(NULL) == -1) - return; + goto out; /* Update the syscall number after orig_ax has potentially been updated * with ptrace. @@ -37,5 +37,6 @@ void handle_syscall(struct uml_pt_regs *r) PT_REGS_SET_SYSCALL_RETURN(regs, EXECUTE_SYSCALL(syscall, regs)); +out: syscall_trace_leave(regs); } -- 2.8.1