| Message ID | 20191216223621.5127-18-casey@schaufler-ca.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v12,01/25] LSM: Infrastructure management of the sock security | expand |
On 12/16/19 5:36 PM, Casey Schaufler wrote: > 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. > > Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> > --- > 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 e20011281915..98d20178e60f 100644 > --- a/fs/nfsd/nfs4xdr.c > +++ b/fs/nfsd/nfs4xdr.c > @@ -2304,11 +2304,11 @@ 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; > > @@ -2318,13 +2318,13 @@ 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 > > @@ -2421,9 +2421,7 @@ 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; > @@ -2481,7 +2479,7 @@ 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); > @@ -2911,8 +2909,7 @@ 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; > } > @@ -2924,10 +2921,8 @@ 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 a5eba06a9382..d0fab9f5dddf 100644 > --- a/include/linux/security.h > +++ b/include/linux/security.h > @@ -537,7 +537,7 @@ 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 */ > > @@ -1362,7 +1362,8 @@ 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 8aa107b57af9..963641acf9dc 100644 > --- a/security/security.c > +++ b/security/security.c > @@ -2207,9 +2207,18 @@ 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); > >
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index e20011281915..98d20178e60f 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -2304,11 +2304,11 @@ 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; @@ -2318,13 +2318,13 @@ 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 @@ -2421,9 +2421,7 @@ 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; @@ -2481,7 +2479,7 @@ 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); @@ -2911,8 +2909,7 @@ 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; } @@ -2924,10 +2921,8 @@ 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 a5eba06a9382..d0fab9f5dddf 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -537,7 +537,7 @@ 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 */ @@ -1362,7 +1362,8 @@ 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 8aa107b57af9..963641acf9dc 100644 --- a/security/security.c +++ b/security/security.c @@ -2207,9 +2207,18 @@ 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);
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. 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(-)