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SELinux: use a helper function to determine seclabel

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Use a helper to determine if a superblock should have the seclabel flag
rather than doing it in the function.  I'm going to use this in the
security server as well.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2012-10-10 14:27:35 -04:00
parent a64c54cf08
commit b43e725d8d
1 changed files with 24 additions and 14 deletions
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38
security/selinux/hooks.c
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@ -354,6 +354,29 @@ static int may_context_mount_inode_relabel(u32 sid,
return rc;
}
static int selinux_is_sblabel_mnt(struct super_block *sb)
{
struct superblock_security_struct *sbsec = sb->s_security;
if (sbsec->behavior == SECURITY_FS_USE_XATTR ||
sbsec->behavior == SECURITY_FS_USE_TRANS ||
sbsec->behavior == SECURITY_FS_USE_TASK)
return 1;
/* Special handling for sysfs. Is genfs but also has setxattr handler*/
if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
return 1;
/*
* Special handling for rootfs. Is genfs but supports
* setting SELinux context on in-core inodes.
*/
if (strncmp(sb->s_type->name, "rootfs", sizeof("rootfs")) == 0)
return 1;
return 0;
}
static int sb_finish_set_opts(struct super_block *sb)
{
struct superblock_security_struct *sbsec = sb->s_security;
@ -396,20 +419,7 @@ static int sb_finish_set_opts(struct super_block *sb)
labeling_behaviors[sbsec->behavior-1]);
sbsec->flags |= SE_SBINITIALIZED;
if (sbsec->behavior == SECURITY_FS_USE_XATTR ||
sbsec->behavior == SECURITY_FS_USE_TRANS ||
sbsec->behavior == SECURITY_FS_USE_TASK)
sbsec->flags |= SBLABEL_MNT;
/* Special handling for sysfs. Is genfs but also has setxattr handler*/
if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
sbsec->flags |= SBLABEL_MNT;
/*
* Special handling for rootfs. Is genfs but supports
* setting SELinux context on in-core inodes.
*/
if (strncmp(sb->s_type->name, "rootfs", sizeof("rootfs")) == 0)
if (selinux_is_sblabel_mnt(sb))
sbsec->flags |= SBLABEL_MNT;
/* Initialize the root inode. */