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selinux: policydb - fix byte order and alignment issues

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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: a806f7a161 ("selinux: Create policydb version for Infiniband support")
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Ondrej Mosnacek 2018-10-23 09:02:17 +02:00 committed by Paul Moore
parent 651022382c
commit 5df275cd4c
1 changed files with 36 additions and 15 deletions
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51
security/selinux/ss/policydb.c
View file

@ -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;
c->u.ibpkey.subnet_prefix = be64_to_cpu(*((__be64 *)nodebuf));
/* we need to have subnet_prefix in CPU order */
c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
if (nodebuf[2] > 0xffff ||
nodebuf[3] > 0xffff) {
rc = next_entry(buf, fp, sizeof(u32) * 2);
if (rc)
goto out;
pkey_lo = le32_to_cpu(buf[0]);
pkey_hi = le32_to_cpu(buf[1]);
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;
rc = put_entry(nodebuf, sizeof(u32), 4, fp);
buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
rc = put_entry(buf, sizeof(u32), 2, fp);
if (rc)
return rc;
rc = context_write(p, &c->context[0], fp);