samba/cifs-utils: mount.cifs and umount.cifs fail to anticipate RLIMIT_FSIZE

smbfs in Samba 3.5.8 and earlier attempts to use 1 mount.cifs to append to the /etc/mtab file and 2 umount.cifs to append to the /etc/mtab.tmp file without first checking whether resource limits would interfere, which allows local users to trigger corruption of the /etc/mtab file via a process wi...

Samba mtab lock file race condition

Multiple race conditions in the 1 mount.cifs and 2 umount.cifs programs in Samba 3.6 allow local users to cause a denial of service mounting outage via a SIGKILL signal during a time window when the /etc/mtab file exists...