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([67.169.65.224]) by smtp410.mail.gq1.yahoo.com (Oath Hermes SMTP Server) with ESMTPA ID c6c1622c02b147bc46c9f4505c6f136e; Mon, 16 Jul 2018 18:23:10 +0000 (UTC) To: LSM , LKLM , Paul Moore , Stephen Smalley , SE Linux , "SMACK-discuss@lists.01.org" , John Johansen , Kees Cook , Tetsuo Handa , James Morris References: <8a325db8-e7eb-9581-2b77-fc987a165df7@schaufler-ca.com> X-EEMSG-check-009: 444-444 From: Casey Schaufler Message-ID: Date: Mon, 16 Jul 2018 11:23:07 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <8a325db8-e7eb-9581-2b77-fc987a165df7@schaufler-ca.com> Content-Language: en-US X-Mailman-Approved-At: Mon, 16 Jul 2018 14:38:37 -0400 Subject: PATCH v1 08/22] SELinux: Abstract use of inode security blob X-BeenThere: selinux@tycho.nsa.gov X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Security-Enhanced Linux \(SELinux\) mailing list" List-Post: List-Help: Cc: "Schaufler, Casey" Errors-To: selinux-bounces@tycho.nsa.gov Sender: "Selinux" X-Virus-Scanned: ClamAV using ClamSMTP SELinux: Abstract use of inode security blob Don't use the inode->i_security pointer directly. Provide a helper function that provides the security blob pointer. Signed-off-by: Casey Schaufler --- security/selinux/hooks.c | 26 +++++++++++++------------- security/selinux/include/objsec.h | 6 ++++++ security/selinux/selinuxfs.c | 4 ++-- 3 files changed, 21 insertions(+), 15 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index ea9557ad7b7a..aafd1506fe6b 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -276,7 +276,7 @@ static int __inode_security_revalidate(struct inode *inode, struct dentry *dentry, bool may_sleep) { - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); might_sleep_if(may_sleep); @@ -297,7 +297,7 @@ static int __inode_security_revalidate(struct inode *inode, static struct inode_security_struct *inode_security_novalidate(struct inode *inode) { - return inode->i_security; + return selinux_inode(inode); } static struct inode_security_struct *inode_security_rcu(struct inode *inode, bool rcu) @@ -307,7 +307,7 @@ static struct inode_security_struct *inode_security_rcu(struct inode *inode, boo error = __inode_security_revalidate(inode, NULL, !rcu); if (error) return ERR_PTR(error); - return inode->i_security; + return selinux_inode(inode); } /* @@ -316,14 +316,14 @@ static struct inode_security_struct *inode_security_rcu(struct inode *inode, boo static struct inode_security_struct *inode_security(struct inode *inode) { __inode_security_revalidate(inode, NULL, true); - return inode->i_security; + return selinux_inode(inode); } static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry) { struct inode *inode = d_backing_inode(dentry); - return inode->i_security; + return selinux_inode(inode); } /* @@ -334,7 +334,7 @@ static struct inode_security_struct *backing_inode_security(struct dentry *dentr struct inode *inode = d_backing_inode(dentry); __inode_security_revalidate(inode, dentry, true); - return inode->i_security; + return selinux_inode(inode); } static void inode_free_rcu(struct rcu_head *head) @@ -347,7 +347,7 @@ static void inode_free_rcu(struct rcu_head *head) static void inode_free_security(struct inode *inode) { - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); struct superblock_security_struct *sbsec = inode->i_sb->s_security; /* @@ -1502,7 +1502,7 @@ static int selinux_genfs_get_sid(struct dentry *dentry, static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) { struct superblock_security_struct *sbsec = NULL; - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); u32 task_sid, sid = 0; u16 sclass; struct dentry *dentry; @@ -1803,7 +1803,7 @@ static int inode_has_perm(const struct cred *cred, return 0; sid = cred_sid(cred); - isec = inode->i_security; + isec = selinux_inode(inode); return avc_has_perm(&selinux_state, sid, isec->sid, isec->sclass, perms, adp); @@ -3031,7 +3031,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, /* Possibly defer initialization to selinux_complete_init. */ if (sbsec->flags & SE_SBINITIALIZED) { - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = newsid; isec->initialized = LABEL_INITIALIZED; @@ -3131,7 +3131,7 @@ static noinline int audit_inode_permission(struct inode *inode, unsigned flags) { struct common_audit_data ad; - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); int rc; ad.type = LSM_AUDIT_DATA_INODE; @@ -4138,7 +4138,7 @@ static int selinux_task_kill(struct task_struct *p, struct siginfo *info, static void selinux_task_to_inode(struct task_struct *p, struct inode *inode) { - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); u32 sid = task_sid(p); spin_lock(&isec->lock); @@ -6517,7 +6517,7 @@ static void selinux_release_secctx(char *secdata, u32 seclen) static void selinux_inode_invalidate_secctx(struct inode *inode) { - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); spin_lock(&isec->lock); isec->initialized = LABEL_INVALID; diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h index 2586fbc7e38c..3304a1ee58a4 100644 --- a/security/selinux/include/objsec.h +++ b/security/selinux/include/objsec.h @@ -172,4 +172,10 @@ static inline struct file_security_struct *selinux_file(const struct file *file) return file->f_security; } +static inline struct inode_security_struct *selinux_inode( + const struct inode *inode) +{ + return inode->i_security; +} + #endif /* _SELINUX_OBJSEC_H_ */ diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index a0faf54c00b9..b1847b520772 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -1386,7 +1386,7 @@ static int sel_make_bools(struct selinux_fs_info *fsi) if (len >= PAGE_SIZE) goto out; - isec = (struct inode_security_struct *)inode->i_security; + isec = selinux_inode(inode); ret = security_genfs_sid(fsi->state, "selinuxfs", page, SECCLASS_FILE, &sid); if (ret) { @@ -1949,7 +1949,7 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) goto err; inode->i_ino = ++fsi->last_ino; - isec = (struct inode_security_struct *)inode->i_security; + isec = selinux_inode(inode); isec->sid = SECINITSID_DEVNULL; isec->sclass = SECCLASS_CHR_FILE; isec->initialized = LABEL_INITIALIZED;