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Date: Thu, 20 Jan 2022 16:49:48 -0500
From: Scott Mayhew <smayhew@...hat.com>
To: selinux@...r.kernel.org, linux-nfs@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH RFC v2 2/2] selinux: try to use preparsed sid before calling parse_sid()
Avoid unnecessary parsing of sids that have already been parsed via
selinux_sb_eat_lsm_opts().
Signed-off-by: Scott Mayhew <smayhew@...hat.com>
---
security/selinux/hooks.c | 85 ++++++++++++++++++++++++++++------------
1 file changed, 61 insertions(+), 24 deletions(-)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index f27ca9e870c0..28ba5c8529fa 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -677,36 +677,52 @@ static int selinux_set_mnt_opts(struct super_block *sb,
*/
if (opts) {
if (opts->fscontext) {
- rc = parse_sid(sb, opts->fscontext, &fscontext_sid);
- if (rc)
- goto out;
+ if (opts->preparsed & FSCONTEXT_MNT)
+ fscontext_sid = opts->fscontext_sid;
+ else {
+ rc = parse_sid(sb, opts->fscontext, &fscontext_sid);
+ if (rc)
+ goto out;
+ }
if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
fscontext_sid))
goto out_double_mount;
sbsec->flags |= FSCONTEXT_MNT;
}
if (opts->context) {
- rc = parse_sid(sb, opts->context, &context_sid);
- if (rc)
- goto out;
+ if (opts->preparsed & CONTEXT_MNT)
+ context_sid = opts->context_sid;
+ else {
+ rc = parse_sid(sb, opts->context, &context_sid);
+ if (rc)
+ goto out;
+ }
if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
context_sid))
goto out_double_mount;
sbsec->flags |= CONTEXT_MNT;
}
if (opts->rootcontext) {
- rc = parse_sid(sb, opts->rootcontext, &rootcontext_sid);
- if (rc)
- goto out;
+ if (opts->preparsed & ROOTCONTEXT_MNT)
+ rootcontext_sid = opts->rootcontext_sid;
+ else {
+ rc = parse_sid(sb, opts->rootcontext, &rootcontext_sid);
+ if (rc)
+ goto out;
+ }
if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
rootcontext_sid))
goto out_double_mount;
sbsec->flags |= ROOTCONTEXT_MNT;
}
if (opts->defcontext) {
- rc = parse_sid(sb, opts->defcontext, &defcontext_sid);
- if (rc)
- goto out;
+ if (opts->preparsed & DEFCONTEXT_MNT)
+ defcontext_sid = opts->defcontext_sid;
+ else {
+ rc = parse_sid(sb, opts->defcontext, &defcontext_sid);
+ if (rc)
+ goto out;
+ }
if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
defcontext_sid))
goto out_double_mount;
@@ -2753,32 +2769,48 @@ static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
return 0;
if (opts->fscontext) {
- rc = parse_sid(sb, opts->fscontext, &sid);
- if (rc)
- return rc;
+ if (opts->preparsed & FSCONTEXT_MNT)
+ sid = opts->fscontext_sid;
+ else {
+ rc = parse_sid(sb, opts->fscontext, &sid);
+ if (rc)
+ return rc;
+ }
if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
goto out_bad_option;
}
if (opts->context) {
- rc = parse_sid(sb, opts->context, &sid);
- if (rc)
- return rc;
+ if (opts->preparsed & CONTEXT_MNT)
+ sid = opts->context_sid;
+ else {
+ rc = parse_sid(sb, opts->context, &sid);
+ if (rc)
+ return rc;
+ }
if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
goto out_bad_option;
}
if (opts->rootcontext) {
struct inode_security_struct *root_isec;
root_isec = backing_inode_security(sb->s_root);
- rc = parse_sid(sb, opts->rootcontext, &sid);
- if (rc)
- return rc;
+ if (opts->preparsed & ROOTCONTEXT_MNT)
+ sid = opts->rootcontext_sid;
+ else {
+ rc = parse_sid(sb, opts->rootcontext, &sid);
+ if (rc)
+ return rc;
+ }
if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
goto out_bad_option;
}
if (opts->defcontext) {
- rc = parse_sid(sb, opts->defcontext, &sid);
- if (rc)
- return rc;
+ if (opts->preparsed & DEFCONTEXT_MNT)
+ sid = opts->defcontext_sid;
+ else {
+ rc = parse_sid(sb, opts->defcontext, &sid);
+ if (rc)
+ return rc;
+ }
if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
goto out_bad_option;
}
@@ -2877,6 +2909,11 @@ static int selinux_fs_context_dup(struct fs_context *fc,
if (!opts->defcontext)
return -ENOMEM;
}
+ opts->fscontext_sid = src->fscontext_sid;
+ opts->context_sid = src->context_sid;
+ opts->rootcontext_sid = src->rootcontext_sid;
+ opts->defcontext_sid = src->defcontext_sid;
+ opts->preparsed = src->preparsed;
return 0;
}
--
2.31.1
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