From: Casey Schaufler <casey@schaufler-ca.com> To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov, linux-audit@redhat.com Subject: [PATCH v17 16/23] LSM: Use lsmcontext in security_inode_getsecctx Date: Thu, 14 May 2020 15:11:35 -0700 [thread overview] Message-ID: <20200514221142.11857-17-casey@schaufler-ca.com> (raw) In-Reply-To: <20200514221142.11857-1-casey@schaufler-ca.com> Change the security_inode_getsecctx() interface to fill a lsmcontext structure instead of data and length pointers. This provides the information about which LSM created the context so that security_release_secctx() can use the correct hook. Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> --- fs/nfsd/nfs4xdr.c | 23 +++++++++-------------- include/linux/security.h | 5 +++-- security/security.c | 13 +++++++++++-- 3 files changed, 23 insertions(+), 18 deletions(-) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 61d6b8a0e8f0..6673221d5606 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -2379,11 +2379,11 @@ nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types) #ifdef CONFIG_NFSD_V4_SECURITY_LABEL static inline __be32 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, - void *context, int len) + struct lsmcontext *context) { __be32 *p; - p = xdr_reserve_space(xdr, len + 4 + 4 + 4); + p = xdr_reserve_space(xdr, context->len + 4 + 4 + 4); if (!p) return nfserr_resource; @@ -2393,13 +2393,13 @@ nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, */ *p++ = cpu_to_be32(0); /* lfs */ *p++ = cpu_to_be32(0); /* pi */ - p = xdr_encode_opaque(p, context, len); + p = xdr_encode_opaque(p, context->context, context->len); return 0; } #else static inline __be32 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, - void *context, int len) + struct lsmcontext *context) { return 0; } #endif @@ -2496,9 +2496,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, int err; struct nfs4_acl *acl = NULL; #ifdef CONFIG_NFSD_V4_SECURITY_LABEL - struct lsmcontext scaff; /* scaffolding */ - void *context = NULL; - int contextlen; + struct lsmcontext context = { }; #endif bool contextsupport = false; struct nfsd4_compoundres *resp = rqstp->rq_resp; @@ -2556,7 +2554,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { if (exp->ex_flags & NFSEXP_SECURITY_LABEL) err = security_inode_getsecctx(d_inode(dentry), - &context, &contextlen); + &context); else err = -EOPNOTSUPP; contextsupport = (err == 0); @@ -2986,8 +2984,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, #ifdef CONFIG_NFSD_V4_SECURITY_LABEL if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { - status = nfsd4_encode_security_label(xdr, rqstp, context, - contextlen); + status = nfsd4_encode_security_label(xdr, rqstp, &context); if (status) goto out; } @@ -2999,10 +2996,8 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, out: #ifdef CONFIG_NFSD_V4_SECURITY_LABEL - if (context) { - lsmcontext_init(&scaff, context, contextlen, 0); /*scaffolding*/ - security_release_secctx(&scaff); - } + if (context.context) + security_release_secctx(&context); #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ kfree(acl); if (tempfh) { diff --git a/include/linux/security.h b/include/linux/security.h index c625b69b729e..3f53098ee89f 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -555,7 +555,7 @@ void security_release_secctx(struct lsmcontext *cp); void security_inode_invalidate_secctx(struct inode *inode); int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen); int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen); -int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen); +int security_inode_getsecctx(struct inode *inode, struct lsmcontext *cp); int security_locked_down(enum lockdown_reason what); #else /* CONFIG_SECURITY */ @@ -1381,7 +1381,8 @@ static inline int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 { return -EOPNOTSUPP; } -static inline int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) +static inline int security_inode_getsecctx(struct inode *inode, + struct lsmcontext *cp) { return -EOPNOTSUPP; } diff --git a/security/security.c b/security/security.c index a22c019d397c..d082ef0673d0 100644 --- a/security/security.c +++ b/security/security.c @@ -2230,9 +2230,18 @@ int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) } EXPORT_SYMBOL(security_inode_setsecctx); -int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) +int security_inode_getsecctx(struct inode *inode, struct lsmcontext *cp) { - return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen); + struct security_hook_list *hp; + + memset(cp, 0, sizeof(*cp)); + + hlist_for_each_entry(hp, &security_hook_heads.inode_getsecctx, list) { + cp->slot = hp->lsmid->slot; + return hp->hook.inode_getsecctx(inode, (void **)&cp->context, + &cp->len); + } + return -EOPNOTSUPP; } EXPORT_SYMBOL(security_inode_getsecctx); -- 2.24.1
WARNING: multiple messages have this Message-ID (diff)
From: Casey Schaufler <casey@schaufler-ca.com> To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: john.johansen@canonical.com, linux-audit@redhat.com, sds@tycho.nsa.gov Subject: [PATCH v17 16/23] LSM: Use lsmcontext in security_inode_getsecctx Date: Thu, 14 May 2020 15:11:35 -0700 [thread overview] Message-ID: <20200514221142.11857-17-casey@schaufler-ca.com> (raw) In-Reply-To: <20200514221142.11857-1-casey@schaufler-ca.com> Change the security_inode_getsecctx() interface to fill a lsmcontext structure instead of data and length pointers. This provides the information about which LSM created the context so that security_release_secctx() can use the correct hook. Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> --- fs/nfsd/nfs4xdr.c | 23 +++++++++-------------- include/linux/security.h | 5 +++-- security/security.c | 13 +++++++++++-- 3 files changed, 23 insertions(+), 18 deletions(-) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 61d6b8a0e8f0..6673221d5606 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -2379,11 +2379,11 @@ nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types) #ifdef CONFIG_NFSD_V4_SECURITY_LABEL static inline __be32 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, - void *context, int len) + struct lsmcontext *context) { __be32 *p; - p = xdr_reserve_space(xdr, len + 4 + 4 + 4); + p = xdr_reserve_space(xdr, context->len + 4 + 4 + 4); if (!p) return nfserr_resource; @@ -2393,13 +2393,13 @@ nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, */ *p++ = cpu_to_be32(0); /* lfs */ *p++ = cpu_to_be32(0); /* pi */ - p = xdr_encode_opaque(p, context, len); + p = xdr_encode_opaque(p, context->context, context->len); return 0; } #else static inline __be32 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, - void *context, int len) + struct lsmcontext *context) { return 0; } #endif @@ -2496,9 +2496,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, int err; struct nfs4_acl *acl = NULL; #ifdef CONFIG_NFSD_V4_SECURITY_LABEL - struct lsmcontext scaff; /* scaffolding */ - void *context = NULL; - int contextlen; + struct lsmcontext context = { }; #endif bool contextsupport = false; struct nfsd4_compoundres *resp = rqstp->rq_resp; @@ -2556,7 +2554,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { if (exp->ex_flags & NFSEXP_SECURITY_LABEL) err = security_inode_getsecctx(d_inode(dentry), - &context, &contextlen); + &context); else err = -EOPNOTSUPP; contextsupport = (err == 0); @@ -2986,8 +2984,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, #ifdef CONFIG_NFSD_V4_SECURITY_LABEL if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { - status = nfsd4_encode_security_label(xdr, rqstp, context, - contextlen); + status = nfsd4_encode_security_label(xdr, rqstp, &context); if (status) goto out; } @@ -2999,10 +2996,8 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, out: #ifdef CONFIG_NFSD_V4_SECURITY_LABEL - if (context) { - lsmcontext_init(&scaff, context, contextlen, 0); /*scaffolding*/ - security_release_secctx(&scaff); - } + if (context.context) + security_release_secctx(&context); #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ kfree(acl); if (tempfh) { diff --git a/include/linux/security.h b/include/linux/security.h index c625b69b729e..3f53098ee89f 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -555,7 +555,7 @@ void security_release_secctx(struct lsmcontext *cp); void security_inode_invalidate_secctx(struct inode *inode); int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen); int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen); -int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen); +int security_inode_getsecctx(struct inode *inode, struct lsmcontext *cp); int security_locked_down(enum lockdown_reason what); #else /* CONFIG_SECURITY */ @@ -1381,7 +1381,8 @@ static inline int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 { return -EOPNOTSUPP; } -static inline int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) +static inline int security_inode_getsecctx(struct inode *inode, + struct lsmcontext *cp) { return -EOPNOTSUPP; } diff --git a/security/security.c b/security/security.c index a22c019d397c..d082ef0673d0 100644 --- a/security/security.c +++ b/security/security.c @@ -2230,9 +2230,18 @@ int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) } EXPORT_SYMBOL(security_inode_setsecctx); -int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) +int security_inode_getsecctx(struct inode *inode, struct lsmcontext *cp) { - return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen); + struct security_hook_list *hp; + + memset(cp, 0, sizeof(*cp)); + + hlist_for_each_entry(hp, &security_hook_heads.inode_getsecctx, list) { + cp->slot = hp->lsmid->slot; + return hp->hook.inode_getsecctx(inode, (void **)&cp->context, + &cp->len); + } + return -EOPNOTSUPP; } EXPORT_SYMBOL(security_inode_getsecctx); -- 2.24.1 -- Linux-audit mailing list Linux-audit@redhat.com https://www.redhat.com/mailman/listinfo/linux-audit
next prev parent reply other threads:[~2020-05-14 22:29 UTC|newest] Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20200514221142.11857-1-casey.ref@schaufler-ca.com> 2020-05-14 22:11 ` [PATCH v17 00/23] LSM: Module stacking for AppArmor Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 01/23] LSM: Infrastructure management of the sock security Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 02/23] LSM: Create and manage the lsmblob data structure Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 03/23] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 04/23] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 05/23] net: Prepare UDS for security module stacking Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-18 17:02 ` Stephen Smalley 2020-05-18 17:02 ` Stephen Smalley 2020-05-14 22:11 ` [PATCH v17 06/23] Use lsmblob in security_secctx_to_secid Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 07/23] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 08/23] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 09/23] LSM: Use lsmblob in security_task_getsecid Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 10/23] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 11/23] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 12/23] IMA: Change internal interfaces to use lsmblobs Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 13/23] LSM: Specify which LSM to display Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 14/23] LSM: Ensure the correct LSM context releaser Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 15/23] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler [this message] 2020-05-14 22:11 ` [PATCH v17 16/23] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 17/23] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 18/23] NET: Store LSM netlabel data in a lsmblob Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 19/23] LSM: Verify LSM display sanity in binder Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 20/23] Audit: Add a new record for multiple subject LSM attributes Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-18 18:02 ` Stephen Smalley 2020-05-18 18:02 ` Stephen Smalley 2020-05-18 20:42 ` Casey Schaufler 2020-05-18 20:42 ` Casey Schaufler 2020-05-18 22:21 ` Paul Moore 2020-05-18 22:21 ` Paul Moore 2020-05-19 0:16 ` Casey Schaufler 2020-05-19 0:16 ` Casey Schaufler 2020-05-19 0:58 ` Casey Schaufler 2020-05-19 0:58 ` Casey Schaufler 2020-05-19 15:48 ` Paul Moore 2020-05-19 15:48 ` Paul Moore 2020-05-14 22:11 ` [PATCH v17 21/23] Audit: Add a new record for multiple object " Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 22/23] LSM: Add /proc attr entry for full LSM context Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler 2020-05-14 22:11 ` [PATCH v17 23/23] AppArmor: Remove the exclusive flag Casey Schaufler 2020-05-14 22:11 ` Casey Schaufler
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