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.

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>

1 files changed, 5 insertions, 1 deletions

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index c86e6d4f67fb..87b6db4ccbc5 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -258,6 +258,10 @@ 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)) {
+                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;
 }