[v1,03/22] SELinux: Abstract use of cred security blob

Message ID	fe1718b2-cb0a-46b1-2698-3230ddcd3935@schaufler-ca.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-security-module-owner@kernel.org> Subject: [PATCH v1 03/22] SELinux: Abstract use of cred security blob To: LSM <linux-security-module@vger.kernel.org>, LKLM <linux-kernel@vger.kernel.org>, Paul Moore <paul@paul-moore.com>, Stephen Smalley <sds@tycho.nsa.gov>, SE Linux <selinux@tycho.nsa.gov>, "SMACK-discuss@lists.01.org" <SMACK-discuss@lists.01.org>, John Johansen <john.johansen@canonical.com>, Kees Cook <keescook@chromium.org>, Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>, James Morris <jmorris@namei.org> Cc: "Schaufler, Casey" <casey.schaufler@intel.com>, Casey Schaufler <casey@schaufler-ca.com> References: <8a325db8-e7eb-9581-2b77-fc987a165df7@schaufler-ca.com> From: Casey Schaufler <casey@schaufler-ca.com> Message-ID: <fe1718b2-cb0a-46b1-2698-3230ddcd3935@schaufler-ca.com> Date: Mon, 16 Jul 2018 11:22:28 -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-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 2b5ee5fbd652..4479c835c592 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -228,7 +228,7 @@ static inline u32 cred_sid(const struct cred *cred) { const struct task_security_struct *tsec; - tsec = cred->security; + tsec = selinux_cred(cred); return tsec->sid; } @@ -464,7 +464,7 @@ static int may_context_mount_sb_relabel(u32 sid, struct superblock_security_struct *sbsec, const struct cred *cred) { - const struct task_security_struct *tsec = cred->security; + const struct task_security_struct *tsec = selinux_cred(cred); int rc; rc = avc_has_perm(&selinux_state, @@ -483,7 +483,7 @@ static int may_context_mount_inode_relabel(u32 sid, struct superblock_security_struct *sbsec, const struct cred *cred) { - const struct task_security_struct *tsec = cred->security; + const struct task_security_struct *tsec = selinux_cred(cred); int rc; rc = avc_has_perm(&selinux_state, tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, @@ -1951,7 +1951,7 @@ static int may_create(struct inode *dir, struct dentry *dentry, u16 tclass) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct inode_security_struct *dsec; struct superblock_security_struct *sbsec; u32 sid, newsid; @@ -1973,7 +1973,7 @@ static int may_create(struct inode *dir, if (rc) return rc; - rc = selinux_determine_inode_label(current_security(), dir, + rc = selinux_determine_inode_label(selinux_cred(current_cred()), dir, &dentry->d_name, tclass, &newsid); if (rc) return rc; @@ -2480,8 +2480,8 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm) if (bprm->called_set_creds) return 0; - old_tsec = current_security(); - new_tsec = bprm->cred->security; + old_tsec = selinux_cred(current_cred()); + new_tsec = selinux_cred(bprm->cred); isec = inode_security(inode); /* Default to the current task SID. */ @@ -2645,7 +2645,7 @@ static void selinux_bprm_committing_creds(struct linux_binprm *bprm) struct rlimit *rlim, *initrlim; int rc, i; - new_tsec = bprm->cred->security; + new_tsec = selinux_cred(bprm->cred); if (new_tsec->sid == new_tsec->osid) return; @@ -2688,7 +2688,7 @@ static void selinux_bprm_committing_creds(struct linux_binprm *bprm) */ static void selinux_bprm_committed_creds(struct linux_binprm *bprm) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct itimerval itimer; u32 osid, sid; int rc, i; @@ -2991,7 +2991,7 @@ static int selinux_dentry_init_security(struct dentry *dentry, int mode, u32 newsid; int rc; - rc = selinux_determine_inode_label(current_security(), + rc = selinux_determine_inode_label(selinux_cred(current_cred()), d_inode(dentry->d_parent), name, inode_mode_to_security_class(mode), &newsid); @@ -3011,14 +3011,14 @@ static int selinux_dentry_create_files_as(struct dentry *dentry, int mode, int rc; struct task_security_struct *tsec; - rc = selinux_determine_inode_label(old->security, + rc = selinux_determine_inode_label(selinux_cred(old), d_inode(dentry->d_parent), name, inode_mode_to_security_class(mode), &newsid); if (rc) return rc; - tsec = new->security; + tsec = selinux_cred(new); tsec->create_sid = newsid; return 0; } @@ -3028,7 +3028,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, const char **name, void **value, size_t *len) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct superblock_security_struct *sbsec; u32 newsid, clen; int rc; @@ -3038,7 +3038,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, newsid = tsec->create_sid; - rc = selinux_determine_inode_label(current_security(), + rc = selinux_determine_inode_label(selinux_cred(current_cred()), dir, qstr, inode_mode_to_security_class(inode->i_mode), &newsid); @@ -3500,7 +3500,7 @@ static int selinux_inode_copy_up(struct dentry *src, struct cred **new) return -ENOMEM; } - tsec = new_creds->security; + tsec = selinux_cred(new_creds); /* Get label from overlay inode and set it in create_sid */ selinux_inode_getsecid(d_inode(src), &sid); tsec->create_sid = sid; @@ -3920,7 +3920,7 @@ static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp) */ static void selinux_cred_free(struct cred *cred) { - struct task_security_struct *tsec = cred->security; + struct task_security_struct *tsec = selinux_cred(cred); /* * cred->security == NULL if security_cred_alloc_blank() or @@ -3940,7 +3940,7 @@ static int selinux_cred_prepare(struct cred *new, const struct cred *old, const struct task_security_struct *old_tsec; struct task_security_struct *tsec; - old_tsec = old->security; + old_tsec = selinux_cred(old); tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp); if (!tsec) @@ -3955,8 +3955,8 @@ static int selinux_cred_prepare(struct cred *new, const struct cred *old, */ static void selinux_cred_transfer(struct cred *new, const struct cred *old) { - const struct task_security_struct *old_tsec = old->security; - struct task_security_struct *tsec = new->security; + const struct task_security_struct *old_tsec = selinux_cred(old); + struct task_security_struct *tsec = selinux_cred(new); *tsec = *old_tsec; } @@ -3972,7 +3972,7 @@ static void selinux_cred_getsecid(const struct cred *c, u32 *secid) */ static int selinux_kernel_act_as(struct cred *new, u32 secid) { - struct task_security_struct *tsec = new->security; + struct task_security_struct *tsec = selinux_cred(new); u32 sid = current_sid(); int ret; @@ -3997,7 +3997,7 @@ static int selinux_kernel_act_as(struct cred *new, u32 secid) static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode) { struct inode_security_struct *isec = inode_security(inode); - struct task_security_struct *tsec = new->security; + struct task_security_struct *tsec = selinux_cred(new); u32 sid = current_sid(); int ret; @@ -4532,7 +4532,7 @@ static int sock_has_perm(struct sock *sk, u32 perms) static int selinux_socket_create(int family, int type, int protocol, int kern) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); u32 newsid; u16 secclass; int rc; @@ -4552,7 +4552,7 @@ static int selinux_socket_create(int family, int type, static int selinux_socket_post_create(struct socket *sock, int family, int type, int protocol, int kern) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct inode_security_struct *isec = inode_security_novalidate(SOCK_INODE(sock)); struct sk_security_struct *sksec; u16 sclass = socket_type_to_security_class(family, type, protocol); @@ -5430,7 +5430,7 @@ static int selinux_secmark_relabel_packet(u32 sid) const struct task_security_struct *__tsec; u32 tsid; - __tsec = current_security(); + __tsec = selinux_cred(current_cred()); tsid = __tsec->sid; return avc_has_perm(&selinux_state, @@ -6367,7 +6367,7 @@ static int selinux_getprocattr(struct task_struct *p, unsigned len; rcu_read_lock(); - __tsec = __task_cred(p)->security; + __tsec = selinux_cred(__task_cred(p)); if (current != p) { error = avc_has_perm(&selinux_state, @@ -6490,7 +6490,7 @@ static int selinux_setprocattr(const char *name, void *value, size_t size) operation. See selinux_bprm_set_creds for the execve checks and may_create for the file creation checks. The operation will then fail if the context is not permitted. */ - tsec = new->security; + tsec = selinux_cred(new); if (!strcmp(name, "exec")) { tsec->exec_sid = sid; } else if (!strcmp(name, "fscreate")) { @@ -6619,7 +6619,7 @@ static int selinux_key_alloc(struct key *k, const struct cred *cred, if (!ksec) return -ENOMEM; - tsec = cred->security; + tsec = selinux_cred(cred); if (tsec->keycreate_sid) ksec->sid = tsec->keycreate_sid; else diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h index cc5e26b0161b..734b6833bdff 100644 --- a/security/selinux/include/objsec.h +++ b/security/selinux/include/objsec.h @@ -158,4 +158,9 @@ struct bpf_security_struct { u32 sid; /*SID of bpf obj creater*/ }; +static inline struct task_security_struct *selinux_cred(const struct cred *cred) +{ + return cred->security; +} + #endif /* _SELINUX_OBJSEC_H_ */ diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c index 91dc3783ed94..8ffe7e1053c4 100644 --- a/security/selinux/xfrm.c +++ b/security/selinux/xfrm.c @@ -79,7 +79,7 @@ static int selinux_xfrm_alloc_user(struct xfrm_sec_ctx **ctxp, gfp_t gfp) { int rc; - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct xfrm_sec_ctx *ctx = NULL; u32 str_len; @@ -138,7 +138,7 @@ static void selinux_xfrm_free(struct xfrm_sec_ctx *ctx) */ static int selinux_xfrm_delete(struct xfrm_sec_ctx *ctx) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); if (!ctx) return 0;

[v1,03/22] SELinux: Abstract use of cred security blob

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