diff options
| author | Todd C. Miller <millert@cvs.openbsd.org> | 1997-06-22 23:57:24 +0000 |
|---|---|---|
| committer | Todd C. Miller <millert@cvs.openbsd.org> | 1997-06-22 23:57:24 +0000 |
| commit | f59b2daf2885b6bba8bbd41dd0cde389f07f1a96 (patch) | |
| tree | 76ced81b653181762f0ee6d521b68762a73f4a72 /lib/libutil/pw_lock.3 | |
| parent | 94ae4e2289dfc87ef067f8411c15861609600c11 (diff) | |
Use O_EXLOCK option of open(2) to open /etc/ptmp with an exclusive
lock. This fixes a DOS bug where a user could run passwd(1) and
send it a SIGKILL, thus leaving /etc/ptmp in place.
Diffstat (limited to 'lib/libutil/pw_lock.3')
| -rw-r--r-- | lib/libutil/pw_lock.3 | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/libutil/pw_lock.3 b/lib/libutil/pw_lock.3 index b5791af817c..f5fed6157d4 100644 --- a/lib/libutil/pw_lock.3 +++ b/lib/libutil/pw_lock.3 @@ -60,8 +60,10 @@ functions allow a program to update the system passwd database. The .Fn pw_lock function attempts to lock the passwd database by creating the file -.Pa /etc/ptmp , -and returns the file descriptor of that file. If +.Pa /etc/ptmp +with an exclusive lock (using +.Xr flock 2 +semantics) and returns the file descriptor of that file. If .Fa retries is greater than zero, .Fn pw_lock @@ -102,4 +104,5 @@ functions return -1 if they are unable to complete properly. .It Pa /etc/ptmp .El .Sh SEE ALSO +.Xr flock 2 , .Xr pw_init 3 |