luck/tmp_suning_uos_patched
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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>
This commit is contained in:
Jesper Juhl 2010-12-24 21:28:56 +01:00 committed by Michal Marek
parent 731ece41fb
commit 96aebafa63
1 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
usr/gen_init_cpio.c
View File

@ -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");