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glibc/glibc-rh168253-builtin_expect.patch

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Rebase DNS stub resolver to the glibc 2.26 version - Support an arbitrary number of search domains (#168253) - Detect and apply /etc/resolv.conf changes in libresolv (#1374239) - CVE-2015-5180: DNS stub resolver crash with crafted record type (#1251403)
2017-10-11 12:41:27 +00:00
commit bee05c9d58a34ec5886faf3b56ecaa56355d94bf
Author: Florian Weimer <fweimer@redhat.com>
Date: Wed Apr 19 14:29:11 2017 +0200
resolv: Replace __builtin_expect with __glibc_unlikely/__glibc_likely
diff --git a/resolv/gai_suspend.c b/resolv/gai_suspend.c
index 3ee6a08b4fd9f2fb..a86bd4360d6b03e8 100644
--- a/resolv/gai_suspend.c
+++ b/resolv/gai_suspend.c
@@ -141,7 +141,7 @@ gai_suspend (const struct gaicb *const list[], int ent,
/* An error occurred. Possibly it's EINTR. We have to translate
the timeout error report of `pthread_cond_timedwait' to the
form expected from `gai_suspend'. */
- if (__builtin_expect (result, ETIMEDOUT) == ETIMEDOUT)
+ if (__glibc_likely (result == ETIMEDOUT))
result = EAI_AGAIN;
else if (result == EINTR)
result = EAI_INTR;
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
index 705b3c9c078c41bf..7099d093f357e16c 100644
--- a/resolv/nss_dns/dns-host.c
+++ b/resolv/nss_dns/dns-host.c
@@ -619,7 +619,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
ancount = ntohs (hp->ancount);
qdcount = ntohs (hp->qdcount);
cp = answer->buf + HFIXEDSZ;
- if (__builtin_expect (qdcount, 1) != 1)
+ if (__glibc_unlikely (qdcount != 1))
{
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
@@ -633,7 +633,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
packtmp, sizeof packtmp);
if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
{
- if (__builtin_expect (errno, 0) == EMSGSIZE)
+ if (__glibc_unlikely (errno) == EMSGSIZE)
goto too_small;
n = -1;
@@ -642,13 +642,19 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
if (n > 0 && bp[0] == '.')
bp[0] = '\0';
- if (__builtin_expect (n < 0 || ((*name_ok) (bp) == 0 && (errno = EBADMSG)),
- 0))
+ if (__glibc_unlikely (n < 0))
{
*errnop = errno;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
+ if (__glibc_unlikely (name_ok (bp) == 0))
+ {
+ errno = EBADMSG;
+ *errnop = EBADMSG;
+ *h_errnop = NO_RECOVERY;
+ return NSS_STATUS_UNAVAIL;
+ }
cp += n + QFIXEDSZ;
if (qtype == T_A || qtype == T_AAAA)
@@ -690,7 +696,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
packtmp, sizeof packtmp);
if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
{
- if (__builtin_expect (errno, 0) == EMSGSIZE)
+ if (__glibc_unlikely (errno == EMSGSIZE))
goto too_small;
n = -1;
@@ -750,7 +756,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
/* Store alias. */
*ap++ = bp;
n = strlen (bp) + 1; /* For the \0. */
- if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
+ if (__glibc_unlikely (n >= MAXHOSTNAMELEN))
{
++had_error;
continue;
@@ -761,7 +767,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
n = strlen (tbuf) + 1; /* For the \0. */
if (__glibc_unlikely (n > linebuflen))
goto too_small;
- if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
+ if (__glibc_unlikely (n >= MAXHOSTNAMELEN))
{
++had_error;
continue;
@@ -789,7 +795,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
n = strlen (tbuf) + 1; /* For the \0. */
if (__glibc_unlikely (n > linebuflen))
goto too_small;
- if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
+ if (__glibc_unlikely (n >= MAXHOSTNAMELEN))
{
++had_error;
continue;
@@ -821,7 +827,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
packtmp, sizeof packtmp);
if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
{
- if (__builtin_expect (errno, 0) == EMSGSIZE)
+ if (__glibc_unlikely (errno == EMSGSIZE))
goto too_small;
n = -1;
@@ -854,7 +860,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
return NSS_STATUS_SUCCESS;
case T_A:
case T_AAAA:
- if (__builtin_expect (strcasecmp (result->h_name, bp), 0) != 0)
+ if (__glibc_unlikely (strcasecmp (result->h_name, bp) != 0))
{
cp += n;
continue; /* XXX - had_error++ ? */
@@ -975,7 +981,7 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
it later. */
if (n != -1 && __ns_name_ntop (packtmp, buffer, buflen) == -1)
{
- if (__builtin_expect (errno, 0) == EMSGSIZE)
+ if (__glibc_unlikely (errno == EMSGSIZE))
{
too_small:
*errnop = ERANGE;
@@ -986,13 +992,19 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
n = -1;
}
- if (__builtin_expect (n < 0 || (res_hnok (buffer) == 0
- && (errno = EBADMSG)), 0))
+ if (__glibc_unlikely (n < 0))
{
*errnop = errno;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
+ if (__glibc_unlikely (res_hnok (buffer) == 0))
+ {
+ errno = EBADMSG;
+ *errnop = EBADMSG;
+ *h_errnop = NO_RECOVERY;
+ return NSS_STATUS_UNAVAIL;
+ }
cp += n + QFIXEDSZ;
int haveanswer = 0;
@@ -1014,7 +1026,7 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
if (n != -1 &&
(h_namelen = __ns_name_ntop (packtmp, buffer, buflen)) == -1)
{
- if (__builtin_expect (errno, 0) == EMSGSIZE)
+ if (__glibc_unlikely (errno == EMSGSIZE))
goto too_small;
n = -1;
@@ -1128,8 +1140,7 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
buffer += pad;
buflen = buflen > pad ? buflen - pad : 0;
- if (__builtin_expect (buflen < sizeof (struct gaih_addrtuple),
- 0))
+ if (__glibc_unlikely (buflen < sizeof (struct gaih_addrtuple)))
goto too_small;
*pat = (struct gaih_addrtuple *) buffer;
diff --git a/resolv/res_init.c b/resolv/res_init.c
index 923724f86d6a0edc..23676e994dd58be7 100644
--- a/resolv/res_init.c
+++ b/resolv/res_init.c
@@ -356,7 +356,7 @@ __res_vinit(res_state statp, int preinit) {
statp->nsort = nsort;
(void) fclose(fp);
}
- if (__builtin_expect(statp->nscount == 0, 0)) {
+ if (__glibc_unlikely (statp->nscount == 0)) {
statp->nsaddr.sin_addr = __inet_makeaddr(IN_LOOPBACKNET, 1);
statp->nsaddr.sin_family = AF_INET;
statp->nsaddr.sin_port = htons(NAMESERVER_PORT);
diff --git a/resolv/res_query.c b/resolv/res_query.c
index ec65bab04153c2ff..0ca3a650282ec7f0 100644
--- a/resolv/res_query.c
+++ b/resolv/res_query.c
@@ -199,7 +199,7 @@ __libc_res_nquery(res_state statp,
nquery1 = n;
}
- if (__builtin_expect (n <= 0, 0) && !use_malloc) {
+ if (__glibc_unlikely (n <= 0) && !use_malloc) {
/* Retry just in case res_nmkquery failed because of too
short buffer. Shouldn't happen. */
bufsize = (type == T_QUERY_A_AND_AAAA ? 2 : 1) * MAXPACKET;
diff --git a/resolv/res_send.c b/resolv/res_send.c
index 440da90a0b381b84..1835ec7ee507d215 100644
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -424,7 +424,7 @@ __libc_res_nsend(res_state statp, const u_char *buf, int buflen,
* Some resolvers want to even out the load on their nameservers.
* Note that RES_BLAST overrides RES_ROTATE.
*/
- if (__builtin_expect ((statp->options & RES_ROTATE) != 0, 0)) {
+ if (__glibc_unlikely ((statp->options & RES_ROTATE) != 0)) {
struct sockaddr_in ina;
struct sockaddr_in6 *inp;
int lastns = statp->nscount - 1;
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