Do the LE conversions before doing the Infiniband-related range checks. The incorrect checks are otherwise causing a failure to load any policy with an ibendportcon rule on BE systems. This can be reproduced by running (on e.g. ppc64):
cat >my_module.cil <<EOF (type test_ibendport_t) (roletype object_r test_ibendport_t) (ibendportcon mlx4_0 1 (system_u object_r test_ibendport_t ((s0) (s0)))) EOF semodule -i my_module.cil
Also, fix loading/storing the 64-bit subnet prefix for OCON_IBPKEY to use a correctly aligned buffer.
Finally, do not use the 'nodebuf' (u32) buffer where 'buf' (__le32) should be used instead.
Tested internally on a ppc64 machine with a RHEL 7 kernel with this patch applied.
Cc: Daniel Jurgens danielj@mellanox.com Cc: Eli Cohen eli@mellanox.com Cc: James Morris jmorris@namei.org Cc: Doug Ledford dledford@redhat.com Cc: stable@vger.kernel.org # 4.13+ Fixes: a806f7a1616f ("selinux: Create policydb version for Infiniband support") Signed-off-by: Ondrej Mosnacek omosnace@redhat.com --- security/selinux/ss/policydb.c | 51 ++++++++++++++++++++++++---------- 1 file changed, 36 insertions(+), 15 deletions(-)
Changes in v6: - use U8_MAX as the limit for ibendport.port value to emphasize that it is an 8-bit value
Changes in v5: - defer also assignment to 8-bit ibendport.port
Changes in v4: - defer assignment to 16-bit struct fields to after the range check
Changes in v3: - use separate buffer for the 64-bit subnet_prefix - add comments on the byte ordering of subnet_prefix - deduplicate the le32_to_cpu() calls from checks
Changes in v2: - add reproducer to commit message - update e-mail address of James Morris - better Cc also the old SELinux ML
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index f4eadd3f7350..b63ef865ce1e 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -2108,6 +2108,7 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, { int i, j, rc; u32 nel, len; + __be64 prefixbuf[1]; __le32 buf[3]; struct ocontext *l, *c; u32 nodebuf[8]; @@ -2217,21 +2218,30 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, goto out; break; } - case OCON_IBPKEY: - rc = next_entry(nodebuf, fp, sizeof(u32) * 4); + case OCON_IBPKEY: { + u32 pkey_lo, pkey_hi; + + rc = next_entry(prefixbuf, fp, sizeof(u64)); + if (rc) + goto out; + + /* we need to have subnet_prefix in CPU order */ + c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]); + + rc = next_entry(buf, fp, sizeof(u32) * 2); if (rc) goto out;
- c->u.ibpkey.subnet_prefix = be64_to_cpu(*((__be64 *)nodebuf)); + pkey_lo = le32_to_cpu(buf[0]); + pkey_hi = le32_to_cpu(buf[1]);
- if (nodebuf[2] > 0xffff || - nodebuf[3] > 0xffff) { + if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) { rc = -EINVAL; goto out; }
- c->u.ibpkey.low_pkey = le32_to_cpu(nodebuf[2]); - c->u.ibpkey.high_pkey = le32_to_cpu(nodebuf[3]); + c->u.ibpkey.low_pkey = pkey_lo; + c->u.ibpkey.high_pkey = pkey_hi;
rc = context_read_and_validate(&c->context[0], p, @@ -2239,7 +2249,10 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, if (rc) goto out; break; - case OCON_IBENDPORT: + } + case OCON_IBENDPORT: { + u32 port; + rc = next_entry(buf, fp, sizeof(u32) * 2); if (rc) goto out; @@ -2249,12 +2262,13 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, if (rc) goto out;
- if (buf[1] > 0xff || buf[1] == 0) { + port = le32_to_cpu(buf[1]); + if (port > U8_MAX || port == 0) { rc = -EINVAL; goto out; }
- c->u.ibendport.port = le32_to_cpu(buf[1]); + c->u.ibendport.port = port;
rc = context_read_and_validate(&c->context[0], p, @@ -2262,7 +2276,8 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, if (rc) goto out; break; - } + } /* end case */ + } /* end switch */ } } rc = 0; @@ -3105,6 +3120,7 @@ static int ocontext_write(struct policydb *p, struct policydb_compat_info *info, { unsigned int i, j, rc; size_t nel, len; + __be64 prefixbuf[1]; __le32 buf[3]; u32 nodebuf[8]; struct ocontext *c; @@ -3192,12 +3208,17 @@ static int ocontext_write(struct policydb *p, struct policydb_compat_info *info, return rc; break; case OCON_IBPKEY: - *((__be64 *)nodebuf) = cpu_to_be64(c->u.ibpkey.subnet_prefix); + /* subnet_prefix is in CPU order */ + prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
- nodebuf[2] = cpu_to_le32(c->u.ibpkey.low_pkey); - nodebuf[3] = cpu_to_le32(c->u.ibpkey.high_pkey); + rc = put_entry(prefixbuf, sizeof(u64), 1, fp); + if (rc) + return rc; + + buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey); + buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
- rc = put_entry(nodebuf, sizeof(u32), 4, fp); + rc = put_entry(buf, sizeof(u32), 2, fp); if (rc) return rc; rc = context_write(p, &c->context[0], fp);