From: Bodo Stroesser Date: Sat, 3 Sep 2005 22:57:21 +0000 (-0700) Subject: [PATCH] SYSEMU: fix sysaudit / singlestep interaction X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ab1c23c24471c760c573f4fb0dd78e166ddfd844;p=openwrt%2Fstaging%2Fblogic.git [PATCH] SYSEMU: fix sysaudit / singlestep interaction Paolo 'Blaisorblade' Giarrusso This is simply an adjustment for "Ptrace - i386: fix Syscall Audit interaction with singlestep" to work on top of SYSEMU patches, too. On this patch, I have some doubts: I wonder why we need to alter that way ptrace_disable(). I left the patch this way because it has been extensively tested, but I don't understand the reason. The current PTRACE_DETACH handling simply clears child->ptrace; actually this is not enough because entry.S just looks at the thread_flags; actually, do_syscall_trace checks current->ptrace but I don't think depending on that is good, at least for performance, so I think the clearing is done elsewhere. For instance, on PTRACE_CONT it's done, but doing PTRACE_DETACH without PTRACE_CONT is possible (and happens when gdb crashes and one kills it manually). Signed-off-by: Paolo 'Blaisorblade' Giarrusso CC: Roland McGrath Cc: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/i386/kernel/ptrace.c b/arch/i386/kernel/ptrace.c index 3196ba50fcd5..340980203b09 100644 --- a/arch/i386/kernel/ptrace.c +++ b/arch/i386/kernel/ptrace.c @@ -271,6 +271,8 @@ static void clear_singlestep(struct task_struct *child) void ptrace_disable(struct task_struct *child) { clear_singlestep(child); + clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); + clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); } /* @@ -693,14 +695,29 @@ __attribute__((regparm(3))) int do_syscall_trace(struct pt_regs *regs, int entryexit) { int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU), ret = 0; - /* With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP */ + /* With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall + * interception. */ int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP); /* do the secure computing check first */ secure_computing(regs->orig_eax); - if (unlikely(current->audit_context) && entryexit) - audit_syscall_exit(current, AUDITSC_RESULT(regs->eax), regs->eax); + if (unlikely(current->audit_context)) { + if (entryexit) + audit_syscall_exit(current, AUDITSC_RESULT(regs->eax), regs->eax); + /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only + * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is + * not used, entry.S will call us only on syscall exit, not + * entry; so when TIF_SYSCALL_AUDIT is used we must avoid + * calling send_sigtrap() on syscall entry. + * + * Note that when PTRACE_SYSEMU_SINGLESTEP is used, + * is_singlestep is false, despite his name, so we will still do + * the correct thing. + */ + else if (is_singlestep) + goto out; + } if (!(current->ptrace & PT_PTRACED)) goto out;