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selinux: enable genfscon labeling for securityfs 

Add support for genfscon per-file labeling of securityfs files.
This allows for separate labels and thereby access control for
different files. For example a genfscon statement

    genfscon securityfs /integrity/ima/policy \
	system_u:object_r:ima_policy_t:s0

will set a private label to the IMA policy file and thus allow to
control the ability to set the IMA policy. Setting labels directly
with setxattr(2), e.g. by chcon(1) or setfiles(8), is still not
supported.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: line width fixes in the commit description]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Christian Göttsche 2021-09-28 17:39:31 +02:00 committed by Paul Moore
parent d9d8c93938
commit 8a764ef1bd
1 changed files with 2 additions and 1 deletions
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3
security/selinux/hooks.c
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@ -760,7 +760,8 @@ static int selinux_set_mnt_opts(struct super_block *sb,
!strcmp(sb->s_type->name, "tracefs") ||
!strcmp(sb->s_type->name, "binder") ||
!strcmp(sb->s_type->name, "bpf") ||
!strcmp(sb->s_type->name, "pstore"))
!strcmp(sb->s_type->name, "pstore") ||
!strcmp(sb->s_type->name, "securityfs"))
sbsec->flags |= SE_SBGENFS;
if (!strcmp(sb->s_type->name, "sysfs") ||