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selinux: never allow relabeling on context mounts
commita83d6ddaeb
upstream. In the SECURITY_FS_USE_MNTPOINT case we never want to allow relabeling files/directories, so we should never set the SBLABEL_MNT flag. The 'special handling' in selinux_is_sblabel_mnt() is only intended for when the behavior is set to SECURITY_FS_USE_GENFS. While there, make the logic in selinux_is_sblabel_mnt() more explicit and add a BUILD_BUG_ON() to make sure that introducing a new SECURITY_FS_USE_* forces a review of the logic. Fixes:d5f3a5f6e7
("selinux: add security in-core xattr support for pstore and debugfs") Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com> Reviewed-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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6b13ae52ac
commit
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1 changed files with 31 additions and 9 deletions
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@ -497,16 +497,10 @@ static int may_context_mount_inode_relabel(u32 sid,
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return rc;
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}
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static int selinux_is_sblabel_mnt(struct super_block *sb)
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static int selinux_is_genfs_special_handling(struct super_block *sb)
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{
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struct superblock_security_struct *sbsec = sb->s_security;
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return sbsec->behavior == SECURITY_FS_USE_XATTR ||
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sbsec->behavior == SECURITY_FS_USE_TRANS ||
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sbsec->behavior == SECURITY_FS_USE_TASK ||
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sbsec->behavior == SECURITY_FS_USE_NATIVE ||
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/* Special handling. Genfs but also in-core setxattr handler */
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!strcmp(sb->s_type->name, "sysfs") ||
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/* Special handling. Genfs but also in-core setxattr handler */
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return !strcmp(sb->s_type->name, "sysfs") ||
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!strcmp(sb->s_type->name, "pstore") ||
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!strcmp(sb->s_type->name, "debugfs") ||
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!strcmp(sb->s_type->name, "tracefs") ||
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@ -516,6 +510,34 @@ static int selinux_is_sblabel_mnt(struct super_block *sb)
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!strcmp(sb->s_type->name, "cgroup2")));
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}
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static int selinux_is_sblabel_mnt(struct super_block *sb)
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{
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struct superblock_security_struct *sbsec = sb->s_security;
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/*
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* IMPORTANT: Double-check logic in this function when adding a new
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* SECURITY_FS_USE_* definition!
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*/
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BUILD_BUG_ON(SECURITY_FS_USE_MAX != 7);
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switch (sbsec->behavior) {
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case SECURITY_FS_USE_XATTR:
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case SECURITY_FS_USE_TRANS:
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case SECURITY_FS_USE_TASK:
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case SECURITY_FS_USE_NATIVE:
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return 1;
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case SECURITY_FS_USE_GENFS:
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return selinux_is_genfs_special_handling(sb);
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/* Never allow relabeling on context mounts */
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case SECURITY_FS_USE_MNTPOINT:
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case SECURITY_FS_USE_NONE:
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default:
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return 0;
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}
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}
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static int sb_finish_set_opts(struct super_block *sb)
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{
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struct superblock_security_struct *sbsec = sb->s_security;
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