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26fb3f4504
glibc/glibc-RHEL-2426-4.patch
Siddhesh Poyarekar 8549c41db6 CVE-2023-4806 glibc: potential use-after-free in getaddrinfo 
Resolves: RHEL-2426
2023-09-16 09:01:34 -04:00

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commit e05e5889b8a307fe4be55b03bcbd7a1c62fc2f2d
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Thu Feb 10 13:27:11 2022 +0530
gaih_inet: Simplify service resolution
Refactor the code to split out the service resolution code into a
separate function. Allocate the service tuples array just once to the
size of the typeproto array, thus avoiding the unnecessary pointer
chasing and stack allocations.
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: DJ Delorie <dj@redhat.com>
(cherry picked from commit 8d6cf99f2fb81a097f9334c125e5c23604af1a98)
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index ed70e6cb3944d219..8c78ef9570fe0f58 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -100,14 +100,12 @@ struct gaih_service
struct gaih_servtuple
{
- struct gaih_servtuple *next;
int socktype;
int protocol;
int port;
+ bool set;
};
-static const struct gaih_servtuple nullserv;
-
struct gaih_typeproto
{
@@ -180,11 +178,11 @@ gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
}
while (r);
- st->next = NULL;
st->socktype = tp->socktype;
st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
? req->ai_protocol : tp->protocol);
st->port = s->s_port;
+ st->set = true;
return 0;
}
@@ -375,20 +373,11 @@ process_canonname (const struct addrinfo *req, const char *orig_name,
}
static int
-gaih_inet (const char *name, const struct gaih_service *service,
- const struct addrinfo *req, struct addrinfo **pai,
- unsigned int *naddrs, struct scratch_buffer *tmpbuf)
+get_servtuples (const struct gaih_service *service, const struct addrinfo *req,
+ struct gaih_servtuple *st, struct scratch_buffer *tmpbuf)
{
+ int i;
const struct gaih_typeproto *tp = gaih_inet_typeproto;
- struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv;
- struct gaih_addrtuple *at = NULL;
- bool got_ipv6 = false;
- char *canon = NULL;
- const char *orig_name = name;
-
- /* Reserve stack memory for the scratch buffer in the getaddrinfo
- function. */
- size_t alloca_used = sizeof (struct scratch_buffer);
if (req->ai_protocol || req->ai_socktype)
{
@@ -410,98 +399,88 @@ gaih_inet (const char *name, const struct gaih_service *service,
}
}
- int port = 0;
- if (service != NULL)
+ if (service != NULL && (tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
+ return -EAI_SERVICE;
+
+ if (service == NULL || service->num >= 0)
{
- if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
- return -EAI_SERVICE;
+ int port = service != NULL ? htons (service->num) : 0;
- if (service->num < 0)
+ if (req->ai_socktype || req->ai_protocol)
{
- if (tp->name[0])
- {
- st = (struct gaih_servtuple *)
- alloca_account (sizeof (struct gaih_servtuple), alloca_used);
-
- int rc = gaih_inet_serv (service->name, tp, req, st, tmpbuf);
- if (__glibc_unlikely (rc != 0))
- return rc;
- }
- else
- {
- struct gaih_servtuple **pst = &st;
- for (tp++; tp->name[0]; tp++)
- {
- struct gaih_servtuple *newp;
+ st[0].socktype = tp->socktype;
+ st[0].protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
+ ? req->ai_protocol : tp->protocol);
+ st[0].port = port;
+ st[0].set = true;
- if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
- continue;
+ return 0;
+ }
- if (req->ai_socktype != 0
- && req->ai_socktype != tp->socktype)
- continue;
- if (req->ai_protocol != 0
- && !(tp->protoflag & GAI_PROTO_PROTOANY)
- && req->ai_protocol != tp->protocol)
- continue;
+ /* Neither socket type nor protocol is set. Return all socket types
+ we know about. */
+ for (i = 0, ++tp; tp->name[0]; ++tp)
+ if (tp->defaultflag)
+ {
+ st[i].socktype = tp->socktype;
+ st[i].protocol = tp->protocol;
+ st[i].port = port;
+ st[i++].set = true;
+ }
- newp = (struct gaih_servtuple *)
- alloca_account (sizeof (struct gaih_servtuple),
- alloca_used);
+ return 0;
+ }
- if (gaih_inet_serv (service->name,
- tp, req, newp, tmpbuf) != 0)
- continue;
+ if (tp->name[0])
+ return gaih_inet_serv (service->name, tp, req, st, tmpbuf);
- *pst = newp;
- pst = &(newp->next);
- }
- if (st == (struct gaih_servtuple *) &nullserv)
- return -EAI_SERVICE;
- }
- }
- else
- {
- port = htons (service->num);
- goto got_port;
- }
- }
- else
+ for (i = 0, tp++; tp->name[0]; tp++)
{
- got_port:
+ if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
+ continue;
- if (req->ai_socktype || req->ai_protocol)
- {
- st = alloca_account (sizeof (struct gaih_servtuple), alloca_used);
- st->next = NULL;
- st->socktype = tp->socktype;
- st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
- ? req->ai_protocol : tp->protocol);
- st->port = port;
- }
- else
- {
- /* Neither socket type nor protocol is set. Return all socket types
- we know about. */
- struct gaih_servtuple **lastp = &st;
- for (++tp; tp->name[0]; ++tp)
- if (tp->defaultflag)
- {
- struct gaih_servtuple *newp;
+ if (req->ai_socktype != 0
+ && req->ai_socktype != tp->socktype)
+ continue;
+ if (req->ai_protocol != 0
+ && !(tp->protoflag & GAI_PROTO_PROTOANY)
+ && req->ai_protocol != tp->protocol)
+ continue;
- newp = alloca_account (sizeof (struct gaih_servtuple),
- alloca_used);
- newp->next = NULL;
- newp->socktype = tp->socktype;
- newp->protocol = tp->protocol;
- newp->port = port;
+ if (gaih_inet_serv (service->name,
+ tp, req, &st[i], tmpbuf) != 0)
+ continue;
- *lastp = newp;
- lastp = &newp->next;
- }
- }
+ i++;
}
+ if (!st[0].set)
+ return -EAI_SERVICE;
+
+ return 0;
+}
+
+static int
+gaih_inet (const char *name, const struct gaih_service *service,
+ const struct addrinfo *req, struct addrinfo **pai,
+ unsigned int *naddrs, struct scratch_buffer *tmpbuf)
+{
+ struct gaih_servtuple st[sizeof (gaih_inet_typeproto)
+ / sizeof (struct gaih_typeproto)] = {0};
+
+ struct gaih_addrtuple *at = NULL;
+ bool got_ipv6 = false;
+ char *canon = NULL;
+ const char *orig_name = name;
+
+ /* Reserve stack memory for the scratch buffer in the getaddrinfo
+ function. */
+ size_t alloca_used = sizeof (struct scratch_buffer);
+
+ int rc;
+ if ((rc = get_servtuples (service, req, st, tmpbuf)) != 0)
+ return rc;
+
bool malloc_name = false;
struct gaih_addrtuple *addrmem = NULL;
int result = 0;
@@ -1083,7 +1062,6 @@ gaih_inet (const char *name, const struct gaih_service *service,
if ((result = process_canonname (req, orig_name, &canon)) != 0)
goto free_and_return;
- struct gaih_servtuple *st2;
struct gaih_addrtuple *at2 = at;
size_t socklen;
sa_family_t family;
@@ -1109,7 +1087,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
else
socklen = sizeof (struct sockaddr_in);
- for (st2 = st; st2 != NULL; st2 = st2->next)
+ for (int i = 0; st[i].set; i++)
{
struct addrinfo *ai;
ai = *pai = malloc (sizeof (struct addrinfo) + socklen);
@@ -1121,8 +1099,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
ai->ai_flags = req->ai_flags;
ai->ai_family = family;
- ai->ai_socktype = st2->socktype;
- ai->ai_protocol = st2->protocol;
+ ai->ai_socktype = st[i].socktype;
+ ai->ai_protocol = st[i].protocol;
ai->ai_addrlen = socklen;
ai->ai_addr = (void *) (ai + 1);
@@ -1144,7 +1122,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
struct sockaddr_in6 *sin6p =
(struct sockaddr_in6 *) ai->ai_addr;
- sin6p->sin6_port = st2->port;
+ sin6p->sin6_port = st[i].port;
sin6p->sin6_flowinfo = 0;
memcpy (&sin6p->sin6_addr,
at2->addr, sizeof (struct in6_addr));
@@ -1154,7 +1132,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
{
struct sockaddr_in *sinp =
(struct sockaddr_in *) ai->ai_addr;
- sinp->sin_port = st2->port;
+ sinp->sin_port = st[i].port;
memcpy (&sinp->sin_addr,
at2->addr, sizeof (struct in_addr));
memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero));
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