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selinux: allow changing labels for cgroupfs

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This patch allows changing labels for cgroup mounts. Previously, running
chcon on cgroupfs would throw an "Operation not supported". This patch
specifically whitelist cgroupfs.

The patch could also allow containers to write only to the systemd cgroup
for instance, while the other cgroups are kept with cgroup_t label.

Signed-off-by: Antonio Murdaca <runcom@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Antonio Murdaca 2017-02-02 16:22:57 +01:00 committed by Paul Moore
parent 3a2f5a59a6
commit 1ea0ce4069
1 changed files with 2 additions and 0 deletions
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2
security/selinux/hooks.c
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@ -480,6 +480,8 @@ static int selinux_is_sblabel_mnt(struct super_block *sb)
sbsec->behavior == SECURITY_FS_USE_NATIVE || sbsec->behavior == SECURITY_FS_USE_NATIVE ||
/* Special handling. Genfs but also in-core setxattr handler */ /* Special handling. Genfs but also in-core setxattr handler */
!strcmp(sb->s_type->name, "sysfs") || !strcmp(sb->s_type->name, "sysfs") ||
!strcmp(sb->s_type->name, "cgroup") ||
!strcmp(sb->s_type->name, "cgroup2") ||
!strcmp(sb->s_type->name, "pstore") || !strcmp(sb->s_type->name, "pstore") ||
!strcmp(sb->s_type->name, "debugfs") || !strcmp(sb->s_type->name, "debugfs") ||
!strcmp(sb->s_type->name, "tracefs") || !strcmp(sb->s_type->name, "tracefs") ||