gen_init_cpio: Avoid race between call to stat() and call to open()

In usr/gen_init_cpio.c::cpio_mkfile() a call to stat() is made based on
pathname, subsequently the file is open()'ed and then the value of the
initial stat() call is used to allocate a buffer. This is not safe since
the file may change between the call to stat() and the call to open().
Safer to just open() the file and then do fstat() using the filedescriptor
returned by open.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

diff --git a/usr/gen_init_cpio.c b/usr/gen_init_cpio.c
index 59df70d..f463caf 100644 (file)
--- a/usr/gen_init_cpio.c
+++ b/usr/gen_init_cpio.c
@@ -309,18 +309,18 @@ static int cpio_mkfile(const char *name, const char *location,
 
        mode |= S_IFREG;
 
-       retval = stat (location, &buf);
-       if (retval) {
-               fprintf (stderr, "File %s could not be located\n", location);
-               goto error;
-       }
-
        file = open (location, O_RDONLY);
        if (file < 0) {
                fprintf (stderr, "File %s could not be opened for reading\n", location);
                goto error;
        }
 
+       retval = fstat (file, &buf);
+       if (retval) {
+               fprintf (stderr, "File %s could not be stat()'ed\n", location);
+               goto error;
+       }
+
        filebuf = malloc(buf.st_size);
        if (!filebuf) {
                fprintf (stderr, "out of memory\n");