linux-kernel - [PATCH 2.6.21 review I] [24/25] x86_64: do not always end the stack trace with ULONG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 10 Feb 2007 12:50:37 +0100 (CET)
From:	Andi Kleen <ak@...e.de>
To:	Catalin Marinas <catalin.marinas@....com>, Andi Kleen <ak@...e.de>,
	Jan Beulich <jbeulich@...ell.com>, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2.6.21 review I] [24/25] x86_64: do not always end the stack trace with ULONG_MAX


From: Catalin Marinas <catalin.marinas@....com>

It makes more sense to end the stack trace with ULONG_MAX only if
nr_entries < max_entries.  Otherwise, we lose one entry in the long stack
traces and cannot know whether the trace was complete or not.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Andi Kleen <ak@...e.de>
Cc: Andi Kleen <ak@...e.de>
Cc: Jan Beulich <jbeulich@...ell.com>
Signed-off-by: Andrew Morton <akpm@...l.org>
---

 arch/x86_64/kernel/stacktrace.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: linux/arch/x86_64/kernel/stacktrace.c
===================================================================
--- linux.orig/arch/x86_64/kernel/stacktrace.c
+++ linux/arch/x86_64/kernel/stacktrace.c
@@ -32,7 +32,7 @@ static void save_stack_address(void *dat
 		trace->skip--;
 		return;
 	}
-	if (trace->nr_entries < trace->max_entries - 1)
+	if (trace->nr_entries < trace->max_entries)
 		trace->entries[trace->nr_entries++] = addr;
 }
 
@@ -49,7 +49,8 @@ static struct stacktrace_ops save_stack_
 void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
 {
 	dump_trace(task, NULL, NULL, &save_stack_ops, trace);
-	trace->entries[trace->nr_entries++] = ULONG_MAX;
+	if (trace->nr_entries < trace->max_entries)
+		trace->entries[trace->nr_entries++] = ULONG_MAX;
 }
 EXPORT_SYMBOL(save_stack_trace);
 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/