Author: cem
Date: Wed May 11 16:20:23 2016
New Revision: 299460
URL: https://svnweb.freebsd.org/changeset/base/299460
Log:
fsck_ffs: Don't overrun mount device buffer
Maybe this case is impossible. Either way, when attempting to "/dev/"-prefix
a
non-global device name, check that we do not overrun the f_mntfromname buffer.
In this case, truncating (with strlcpy or similar) would not be useful, since
the f_mntfromname result of getmntpt() is passed directly to open(2) later.
Reported by: Coverity
CID: 1006789
Sponsored by: EMC / Isilon Storage Division
Modified:
head/sbin/fsck_ffs/main.c
Modified: head/sbin/fsck_ffs/main.c
==============================================================================
--- head/sbin/fsck_ffs/main.c Wed May 11 16:05:32 2016 (r299459)
+++ head/sbin/fsck_ffs/main.c Wed May 11 16:20:23 2016 (r299460)
@@ -644,6 +644,9 @@ getmntpt(const char *name)
statfsp = &mntbuf[i];
ddevname = statfsp->f_mntfromname;
if (*ddevname != '/') {
+ if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
+ sizeof(statfsp->f_mntfromname))
+ continue;
strcpy(device, _PATH_DEV);
strcat(device, ddevname);
strcpy(statfsp->f_mntfromname, device);
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