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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2016-01-05 23:12:33 +0100 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2016-01-08 16:24:27 -0500 |
| commit | b197367ed1ba81b0d26f7e7f76f61731ac6e5842 (patch) | |
| tree | efc5fa3e91a36fd1e4de2aecdc37a697e7867a4d /security | |
| parent | 76319946f321e30872dd72af7de867cb26e7a373 (diff) | |
| download | linux-stable-b197367ed1ba81b0d26f7e7f76f61731ac6e5842.tar.gz linux-stable-b197367ed1ba81b0d26f7e7f76f61731ac6e5842.tar.bz2 linux-stable-b197367ed1ba81b0d26f7e7f76f61731ac6e5842.zip | |
selinux: Inode label revalidation performance fix
Commit 5d226df4 has introduced a performance regression of about
10% in the UnixBench pipe benchmark. It turns out that the call
to inode_security in selinux_file_permission can be moved below
the zero-mask test and that inode_security_revalidate can be
removed entirely, which brings us back to roughly the original
performance.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/hooks.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 40e071af7783..f8110cfd80ff 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -273,11 +273,6 @@ static int __inode_security_revalidate(struct inode *inode, return 0; } -static void inode_security_revalidate(struct inode *inode) -{ - __inode_security_revalidate(inode, NULL, true); -} - static struct inode_security_struct *inode_security_novalidate(struct inode *inode) { return inode->i_security; @@ -3277,19 +3272,19 @@ static int selinux_file_permission(struct file *file, int mask) { struct inode *inode = file_inode(file); struct file_security_struct *fsec = file->f_security; - struct inode_security_struct *isec = inode_security(inode); + struct inode_security_struct *isec; u32 sid = current_sid(); if (!mask) /* No permission to check. Existence test. */ return 0; + isec = inode_security(inode); if (sid == fsec->sid && fsec->isid == isec->sid && fsec->pseqno == avc_policy_seqno()) /* No change since file_open check. */ return 0; - inode_security_revalidate(inode); return selinux_revalidate_file_permission(file, mask); } @@ -3595,7 +3590,6 @@ static int selinux_file_open(struct file *file, const struct cred *cred) * new inode label or new policy. * This check is not redundant - do not remove. */ - inode_security_revalidate(file_inode(file)); return file_path_has_perm(cred, file, open_file_to_av(file)); } |