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Code Issues Releases Activity

Zero out the file directory entry metadata to reduce disk

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scavenging disclosure.

Submitted by: David G. Lawrence <dg@dglawrence.com>
MFC after:    1 week
This commit is contained in:
Kirk McKusick 2019-05-04 18:00:57 +00:00
parent 83dc49beaf
commit 44b193b09e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=347130
1 changed files with 11 additions and 6 deletions
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17
sys/ufs/ufs/ufs_lookup.c
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@ -1218,16 +1218,21 @@ ufs_dirremove(dvp, ip, flags, isrmdir)
if (ip && rep->d_ino != ip->i_number)
panic("ufs_dirremove: ip %ju does not match dirent ino %ju\n",
(uintmax_t)ip->i_number, (uintmax_t)rep->d_ino);
if (dp->i_count == 0) {
/*
* First entry in block: set d_ino to zero.
*/
ep->d_ino = 0;
} else {
/*
* Zero out the file directory entry metadata to reduce disk
* scavenging disclosure.
*/
bzero(&rep->d_name[0], rep->d_namlen);
rep->d_namlen = 0;
rep->d_type = 0;
rep->d_ino = 0;
if (dp->i_count != 0) {
/*
* Collapse new free space into previous entry.
*/
ep->d_reclen += rep->d_reclen;
rep->d_reclen = 0;
}
#ifdef UFS_DIRHASH
if (dp->i_dirhash != NULL)