* Jovi Zhang <bookj...@gmail.com> [2012-07-18 19:38:27]:
> On Wed, Jul 18, 2012 at 7:07 PM, Srikar Dronamraju
> <sri...@linux.vnet.ibm.com> wrote:
> > The patch looks good,
> >
> > Can you modify the description a bit. However you are free to ignore
> > these comments. After knowing your response, I will ack the patch.
> >
> > I would probably put this as:
> >
> > The subject could be
> > tracing: Verify target file before registering a uprobe event
> >
> > Description:
> > Without this patch, we can register a uprobe event for a directory.
> > Enabling such a uprobe event would anyway fail.
> >
> > Example:
> >
> > $ echo 'p /bin:0x4245c0' > /sys/kernel/debug/tracing/uprobe_events
> >
> > However directories cannot be valid targets for uprobe.
> > Hence verify if the target is a regular file during the probe
> > registration.
>
> Thanks srikar, your description is more clear than mine.
>
>
> From fd5077196038cc271e2116e1fca359a0011e1669 Mon Sep 17 00:00:00 2001
> From: Jovi Zhang <bookj...@gmail.com>
> Date: Wed, 18 Jul 2012 18:16:44 +0800
> Subject: [PATCH] tracing: Verify target file before registering a uprobe
> event
>
> Without this patch, we can register a uprobe event for a directory.
> Enabling such a uprobe event would anyway fail.
>
> 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 <bookj...@gmail.com>
> Reviewed-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
> ---
> 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 85158fa..3b5f646 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -259,6 +259,10 @@ 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)) {
> + ret = -EINVAL;
> + goto fail_address_parse;
> + }
>
> argc -= 2;
> argv += 2;
> @@ -358,7 +362,7 @@ 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;
> }
Looks good.
Acked-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
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