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tracing: Verify target file before registering a uprobe event

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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.

Link: http://lkml.kernel.org/r/20130103004212.690763002@goodmis.org

Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Jovi Zhang <bookjovi@gmail.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
[ cleaned up whitespace and removed redundant IS_DIR() check ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jovi Zhang 2012-07-18 18:16:44 +08:00 committed by Steven Rostedt
parent d8a0349c0c
commit d24d7dbf3c
1 changed files with 5 additions and 1 deletions
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6
kernel/trace/trace_uprobe.c
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@ -258,6 +258,10 @@ static int create_trace_uprobe(int argc, char **argv)
goto fail_address_parse; goto fail_address_parse;
inode = igrab(path.dentry->d_inode); inode = igrab(path.dentry->d_inode);
if (!S_ISREG(inode->i_mode)) {
ret = -EINVAL;
goto fail_address_parse;
}
argc -= 2; argc -= 2;
argv += 2; argv += 2;
@ -356,7 +360,7 @@ static int create_trace_uprobe(int argc, char **argv)
if (inode) if (inode)
iput(inode); iput(inode);
pr_info("Failed to parse address.\n"); pr_info("Failed to parse address or file.\n");
return ret; return ret;
} }