lkml.org 
[lkml]   [2013]   [Jan]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH 3/3] tracing: Verify target file before registering a uprobe event
Date
Hi, Steve.

On Wed, 02 Jan 2013 17:50:38 -0500, Steven Rostedt wrote:
> From: Jovi Zhang <bookjovi@gmail.com>
>
> Without this patch, we can register a uprobe event for a directory.
> Enabling such a uprobe event would fail anyway .
>
> Example:
> $ echo 'p /bin:0x4245c0' > /sys/kernel/debug/tracing/uprobe_events
>
> However dirctories cannot be valid targets for uprobe.
> Hence verify if the target is a regular file during the probe
> registration.
>
> Signed-off-by: Jovi Zhang <bookjovi@gmail.com>
> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
> ---
> kernel/trace/trace_uprobe.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 03003cd..0815f25 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -257,6 +257,10 @@ static int create_trace_uprobe(int argc, char **argv)
> goto fail_address_parse;
>
> inode = igrab(path.dentry->d_inode);
> + if (!S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) {

Doesn't !S_ISREG() include S_ISDIR() case too?

Anyway I can see an additional whitespace in front of the "if".

Thanks,
Namhyung


> + ret = -EINVAL;
> + goto fail_address_parse;
> + }
>
> argc -= 2;
> argv += 2;
> @@ -356,7 +360,7 @@ fail_address_parse:
> if (inode)
> iput(inode);
>
> - pr_info("Failed to parse address.\n");
> + pr_info("Failed to parse address or file.\n");
>
> return ret;
> }


\
 
 \ /
  Last update: 2013-01-04 06:01    [W:0.057 / U:0.132 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site