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| author | pkelsey <pkelsey@FreeBSD.org> | 2015-05-28 05:38:07 +0000 |
|---|---|---|
| committer | pkelsey <pkelsey@FreeBSD.org> | 2015-05-28 05:38:07 +0000 |
| commit | e78dd9d8ebd584a44a515ae0711bca71f63243a6 (patch) | |
| tree | a4a429decdd2db2ce047b274e2e567b2a835c9d1 /sbin/dhclient/dhclient.c | |
| parent | e347653ba08b12386f2285d9827172ad6eaeefea (diff) | |
| download | FreeBSD-src-e78dd9d8ebd584a44a515ae0711bca71f63243a6.zip FreeBSD-src-e78dd9d8ebd584a44a515ae0711bca71f63243a6.tar.gz | |
Add CAP_FCNTL to the lease file capsicum rights, and limit to
CAP_FCNTL_GETFL. Without CAP_FCNTL_GETFL, the lease file truncation
in rewrite_client_leases() will fail to trim old data when rewriting
the file with a lesser amount of data.
Reviewed by: pjd, rwatson
Approved by: jmallett (mentor)
MFC after: 1 week
Diffstat (limited to 'sbin/dhclient/dhclient.c')
| -rw-r--r-- | sbin/dhclient/dhclient.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sbin/dhclient/dhclient.c b/sbin/dhclient/dhclient.c index 22b21f1..7905813 100644 --- a/sbin/dhclient/dhclient.c +++ b/sbin/dhclient/dhclient.c @@ -1845,12 +1845,16 @@ rewrite_client_leases(void) leaseFile = fopen(path_dhclient_db, "w"); if (!leaseFile) error("can't create %s: %m", path_dhclient_db); - cap_rights_init(&rights, CAP_FSTAT, CAP_FSYNC, CAP_FTRUNCATE, - CAP_SEEK, CAP_WRITE); + cap_rights_init(&rights, CAP_FCNTL, CAP_FSTAT, CAP_FSYNC, + CAP_FTRUNCATE, CAP_SEEK, CAP_WRITE); if (cap_rights_limit(fileno(leaseFile), &rights) < 0 && errno != ENOSYS) { error("can't limit lease descriptor: %m"); } + if (cap_fcntls_limit(fileno(leaseFile), CAP_FCNTL_GETFL) < 0 && + errno != ENOSYS) { + error("can't limit lease descriptor fcntls: %m"); + } } else { fflush(leaseFile); rewind(leaseFile); |
