From: Andrey Ryabinin <a.ryabinin@samsung.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Sasha Levin <sasha.levin@oracle.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Guilherme Cox <cox@computer.org>, Tony Luck <tony.luck@gmail.com>,
Xie XiuQi <xiexiuqi@huawei.com>
Subject: Re: [PATCH 07/18 v3] tracing: Add TRACE_DEFINE_ENUM() macro to map enums to their values
Date: Fri, 17 Apr 2015 17:14:58 +0300 [thread overview]
Message-ID: <55311562.6050102@samsung.com> (raw)
In-Reply-To: <20150417095153.54953f33@gandalf.local.home>
On 04/17/2015 04:51 PM, Steven Rostedt wrote:
> On Fri, 17 Apr 2015 09:29:02 -0400
> Steven Rostedt <rostedt@goodmis.org> wrote:
>
>> On Fri, 17 Apr 2015 10:44:42 +0300
>> Andrey Ryabinin <a.ryabinin@samsung.com> wrote:
>>
>>
>>> And kasan is not needed to debug this further.
>>> Just stick WARN_ON(ptr > call->print_fmt + strlen(call->print_fmt)) into the 'for' loop in update_event_printk().
>>
>> Thanks, although I think I found the bug with just inspection. I put in
>> WARN_ON(*ptr) at various locations to see if it triggers.
>
> Yep, that's the issue.
>
> Can you guys test this patch please:
>
Tested-by: Andrey Ryabinin <a.ryabinin@samsung.com>
> -- Steve
>
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index 39bcfc3f071d..97d454a4dbfb 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -1753,6 +1753,8 @@ static void update_event_printk(struct ftrace_event_call *call,
> ptr++;
> /* Check for alpha chars like ULL */
> } while (isalnum(*ptr));
> + if (!*ptr)
> + break;
> /*
> * A number must have some kind of delimiter after
> * it, and we can ignore that too.
> @@ -1779,12 +1781,16 @@ static void update_event_printk(struct ftrace_event_call *call,
> do {
> ptr++;
> } while (isalnum(*ptr) || *ptr == '_');
> + if (!*ptr)
> + break;
> /*
> * If what comes after this variable is a '.' or
> * '->' then we can continue to ignore that string.
> */
> if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) {
> ptr += *ptr == '.' ? 1 : 2;
> + if (!*ptr)
> + break;
> goto skip_more;
> }
> /*
>
next prev parent reply other threads:[~2015-04-17 14:15 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-03 1:38 [PATCH 00/18 v3] tracing: Use TRACE_DEFINE_ENUM() to show enum values Steven Rostedt
2015-04-03 1:38 ` [PATCH 02/18 v3] tracing: Add TRACE_SYSTEM_VAR to intel-sst Steven Rostedt
2015-04-03 1:38 ` [PATCH 03/18 v3] tracing: Add TRACE_SYSTEM_VAR to kvm-s390 Steven Rostedt
2015-04-03 1:38 ` [PATCH 04/18 v3] tracing: Add TRACE_SYSTEM_VAR to xhci-hcd Steven Rostedt
2015-04-03 1:38 ` [PATCH 05/18 v3] tracing: Give system name a pointer Steven Rostedt
2015-04-03 1:38 ` [PATCH 06/18 v3] tracing: Update trace-event-sample with TRACE_SYSTEM_VAR documentation Steven Rostedt
2015-04-03 1:38 ` [PATCH 07/18 v3] tracing: Add TRACE_DEFINE_ENUM() macro to map enums to their values Steven Rostedt
2015-04-06 4:54 ` Namhyung Kim
2015-04-06 11:52 ` Steven Rostedt
2015-04-07 14:16 ` Namhyung Kim
2015-04-07 14:22 ` Steven Rostedt
2015-04-15 13:22 ` Sasha Levin
2015-04-15 14:05 ` Steven Rostedt
2015-04-16 0:58 ` Sasha Levin
2015-04-17 3:21 ` Steven Rostedt
2015-04-17 3:59 ` Sasha Levin
2015-04-17 4:44 ` [PATCH] kasan: Show gcc version requirements in Kconfig and Documentation Joe Perches
2015-04-17 7:54 ` Andrey Ryabinin
2015-04-17 9:37 ` Joe Perches
2015-04-17 16:10 ` [PATCH v2] " Andrey Ryabinin
2015-05-07 15:51 ` Jonathan Corbet
2015-05-07 19:00 ` Andrey Ryabinin
2015-04-17 7:44 ` [PATCH 07/18 v3] tracing: Add TRACE_DEFINE_ENUM() macro to map enums to their values Andrey Ryabinin
2015-04-17 13:29 ` Steven Rostedt
2015-04-17 13:51 ` Steven Rostedt
2015-04-17 14:14 ` Andrey Ryabinin [this message]
2015-04-03 1:38 ` [PATCH 08/18 v3] tracing: Allow for modules to convert their enums to values Steven Rostedt
2015-04-03 1:38 ` [PATCH 09/18 v3] tracing/samples: Update the trace-event-sample.h with TRACE_DEFINE_ENUM() Steven Rostedt
2015-04-03 1:38 ` [PATCH 10/18 v3] x86/tlb/trace: Export enums in used by tlb_flush tracepoint Steven Rostedt
2015-04-03 1:38 ` [PATCH 11/18 v3] net/9p/tracing: Export enums in tracepoints to userspace Steven Rostedt
2015-04-03 1:38 ` [PATCH 12/18 v3] f2fs: Export the enums in the " Steven Rostedt
2015-04-03 1:38 ` [PATCH 13/18 v3] irq/tracing: Export enums in tracepoints to user space Steven Rostedt
2015-04-03 1:38 ` [PATCH 14/18 v3] mm: tracing: " Steven Rostedt
2015-04-03 1:38 ` [PATCH 15/18 v3] SUNRPC: " Steven Rostedt
2015-04-07 16:40 ` Steven Rostedt
2015-04-07 16:58 ` Trond Myklebust
2015-04-03 1:38 ` [PATCH 16/18 v3] v4l: Export enums used by " Steven Rostedt
2015-04-03 1:38 ` [PATCH 17/18 v3] writeback: Export enums used by tracepoint " Steven Rostedt
2015-04-03 1:38 ` [PATCH 18/18 v3] tracing: Add enum_map file to show enums that have been mapped Steven Rostedt
[not found] ` <20150403014123.069113130@goodmis.org>
2015-04-07 0:47 ` [PATCH 01/18 v3] tracing/drm: Remove unused TRACE_SYSTEM_STRING define Masami Hiramatsu
2015-04-07 11:26 ` [PATCH 00/18 v3] tracing: Use TRACE_DEFINE_ENUM() to show enum values Masami Hiramatsu
2015-04-07 12:52 ` Steven Rostedt
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