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Don't unconditionally use alloca in gaih_inet

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This commit is contained in:
Ulrich Drepper 2011-05-20 23:46:03 -04:00
parent 78e64fdcaa
commit 34a9094f49
4 changed files with 367 additions and 102 deletions
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5
ChangeLog
View File

@ -1,5 +1,10 @@
2011-05-20 Ulrich Drepper <drepper@gmail.com>
[BZ #11869]
* sysdeps/posix/getaddrinfo.c (gaih_inet): Don't unconditionally use
alloca.
* include/alloca.h (extend_alloca_account): Define.
[BZ #11857]
* posix/regex.h: Fix comments with documentation of user-accessible
fields after compilation and describe correct free'ing of pattern

12
NEWS
View File

@ -11,12 +11,12 @@ Version 2.14
386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11257, 11258,
11487, 11532, 11578, 11653, 11668, 11697, 11724, 11820, 11837, 11857,
11892, 11895, 11901, 11945, 11947, 11952, 11987, 12052, 12083, 12158,
12178, 12200, 12346, 12393, 12420, 12432, 12445, 12449, 12453, 12454,
12460, 12469, 12489, 12509, 12510, 12511, 12518, 12527, 12541, 12545,
12551, 12582, 12583, 12587, 12597, 12601, 12611, 12625, 12626, 12631,
12650, 12653, 12655, 12660, 12681, 12685, 12711, 12713, 12714, 12717,
12723, 12724, 12734, 12738, 12746, 12766, 12775
11869, 11892, 11895, 11901, 11945, 11947, 11952, 11987, 12052, 12083,
12158, 12178, 12200, 12346, 12393, 12420, 12432, 12445, 12449, 12453,
12454, 12460, 12469, 12489, 12509, 12510, 12511, 12518, 12527, 12541,
12545, 12551, 12582, 12583, 12587, 12597, 12601, 12611, 12625, 12626,
12631, 12650, 12653, 12655, 12660, 12681, 12685, 12711, 12713, 12714,
12717, 12723, 12724, 12734, 12738, 12746, 12766, 12775
* The RPC implementation in libc is obsoleted. Old programs keep working
but new programs cannot be linked with the routines in libc anymore.

19
include/alloca.h
View File

@ -49,15 +49,24 @@ libc_hidden_proto (__libc_alloca_cutoff)
#if defined stackinfo_get_sp && defined stackinfo_sub_sp
# define alloca_account(size, avar) \
({ void *old__ = stackinfo_get_sp (); \
void *m__ = __alloca (size); \
avar += stackinfo_sub_sp (old__); \
({ void *old__ = stackinfo_get_sp (); \
void *m__ = __alloca (size); \
avar += stackinfo_sub_sp (old__); \
m__; })
# define extend_alloca_account(buf, len, newlen, avar) \
({ void *old__ = stackinfo_get_sp (); \
void *m__ = extend_alloca (buf, len, newlen); \
avar += stackinfo_sub_sp (old__); \
m__; })
#else
# define alloca_account(size, avar) \
({ size_t s__ = (size); \
avar += s__; \
({ size_t s__ = (size); \
avar += s__; \
__alloca (s__); })
# define extend_alloca_account(buf, len, newlen, avar) \
({ size_t s__ = (newlen); \
avar += s__; \
extend_alloca (buf, len, s__); })
#endif
#endif

433
sysdeps/posix/getaddrinfo.c
View File

@ -278,6 +278,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
bool got_ipv6 = false;
const char *canon = NULL;
const char *orig_name = name;
size_t alloca_used = 0;
if (req->ai_protocol || req->ai_socktype)
{
@ -310,7 +311,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
if (tp->name[0])
{
st = (struct gaih_servtuple *)
__alloca (sizeof (struct gaih_servtuple));
alloca_account (sizeof (struct gaih_servtuple), alloca_used);
if ((rc = gaih_inet_serv (service->name, tp, req, st)))
return rc;
@ -334,7 +335,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
continue;
newp = (struct gaih_servtuple *)
__alloca (sizeof (struct gaih_servtuple));
alloca_account (sizeof (struct gaih_servtuple),
alloca_used);
if ((rc = gaih_inet_serv (service->name, tp, req, newp)))
{
@ -362,7 +364,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
if (req->ai_socktype || req->ai_protocol)
{
st = __alloca (sizeof (struct gaih_servtuple));
st = alloca_account (sizeof (struct gaih_servtuple), alloca_used);
st->next = NULL;
st->socktype = tp->socktype;
st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
@ -379,7 +381,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
{
struct gaih_servtuple *newp;
newp = __alloca (sizeof (struct gaih_servtuple));
newp = alloca_account (sizeof (struct gaih_servtuple),
alloca_used);
newp->next = NULL;
newp->socktype = tp->socktype;
newp->protocol = tp->protocol;
@ -391,10 +394,17 @@ gaih_inet (const char *name, const struct gaih_service *service,
}
}
bool malloc_name = false;
bool malloc_addrmem = false;
struct gaih_addrtuple *addrmem = NULL;
bool malloc_canonbuf = false;
char *canonbuf = NULL;
bool malloc_tmpbuf = false;
char *tmpbuf = NULL;
int result = 0;
if (name != NULL)
{
at = __alloca (sizeof (struct gaih_addrtuple));
at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used);
at->family = AF_UNSPEC;
at->scopeid = 0;
at->next = NULL;
@ -412,6 +422,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
rc = __idna_to_ascii_lz (name, &p, idn_flags);
if (rc != IDNA_SUCCESS)
{
/* No need to jump to free_and_return here. */
if (rc == IDNA_MALLOC_ERROR)
return -EAI_MEMORY;
if (rc == IDNA_DLOPEN_ERROR)
@ -421,10 +432,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
/* In case the output string is the same as the input string
no new string has been allocated. */
if (p != name)
{
name = strdupa (p);
free (p);
}
malloc_name = true;
}
#endif
@ -441,23 +449,59 @@ gaih_inet (const char *name, const struct gaih_service *service,
at->family = AF_INET6;
}
else
return -EAI_ADDRFAMILY;
{
result = -EAI_ADDRFAMILY;
goto free_and_return;
}
if (req->ai_flags & AI_CANONNAME)
canon = name;
}
else if (at->family == AF_UNSPEC)
{
char *namebuf = (char *) name;
char *scope_delim = strchr (name, SCOPE_DELIMITER);
int e;
if (__builtin_expect (scope_delim != NULL, 0))
{
namebuf = alloca (scope_delim - name + 1);
*((char *) __mempcpy (namebuf, name, scope_delim - name)) = '\0';
}
{
bool malloc_namebuf = false;
char *namebuf = (char *) name;
if (inet_pton (AF_INET6, namebuf, at->addr) > 0)
if (__builtin_expect (scope_delim != NULL, 0))
{
if (malloc_name)
*scope_delim = '\0';
else
{
if (__libc_use_alloca (alloca_used
+ scope_delim - name + 1))
{
namebuf = alloca_account (scope_delim - name + 1,
alloca_used);
*((char *) __mempcpy (namebuf, name,
scope_delim - name)) = '\0';
}
else
{
namebuf = strndup (name, scope_delim - name);
if (namebuf == NULL)
{
assert (!malloc_name);
return -EAI_MEMORY;
}
malloc_namebuf = true;
}
}
}
e = inet_pton (AF_INET6, namebuf, at->addr);
if (malloc_namebuf)
free (namebuf);
else if (scope_delim != NULL && malloc_name)
/* Undo what we did above. */
*scope_delim = SCOPE_DELIMITER;
}
if (e > 0)
{
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)
at->family = AF_INET6;
@ -468,7 +512,10 @@ gaih_inet (const char *name, const struct gaih_service *service,
at->family = AF_INET;
}
else
return -EAI_ADDRFAMILY;
{
result = -EAI_ADDRFAMILY;
goto free_and_return;
}
if (scope_delim != NULL)
{
@ -490,7 +537,10 @@ gaih_inet (const char *name, const struct gaih_service *service,
at->scopeid = (uint32_t) strtoul (scope_delim + 1, &end,
10);
if (*end != '\0')
return GAIH_OKIFUNSPEC | -EAI_NONAME;
{
result = GAIH_OKIFUNSPEC | -EAI_NONAME;
goto free_and_return;
}
}
}
@ -517,7 +567,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
{
int family = req->ai_family;
size_t tmpbuflen = 512;
char *tmpbuf = alloca (tmpbuflen);
assert (tmpbuf == NULL);
tmpbuf = alloca_account (tmpbuflen, alloca_used);
int rc;
struct hostent th;
struct hostent *h;
@ -529,50 +580,95 @@ gaih_inet (const char *name, const struct gaih_service *service,
tmpbuflen, &h, &herrno);
if (rc != ERANGE || herrno != NETDB_INTERNAL)
break;
tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);
if (!malloc_tmpbuf
&& __libc_use_alloca (alloca_used + 2 * tmpbuflen))
tmpbuf = extend_alloca_account (tmpbuf, tmpbuflen,
2 * tmpbuflen,
alloca_used);
else
{
char *newp = realloc (malloc_tmpbuf ? tmpbuf : NULL,
2 * tmpbuflen);
if (newp == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
tmpbuf = newp;
malloc_tmpbuf = true;
tmpbuflen = 2 * tmpbuflen;
}
}
if (rc == 0)
{
if (h != NULL)
/* We found data, now convert it into the list. */
for (int i = 0; h->h_addr_list[i]; ++i)
{
if (*pat == NULL)
{
*pat = __alloca (sizeof (struct gaih_addrtuple));
(*pat)->scopeid = 0;
}
(*pat)->next = NULL;
(*pat)->family = req->ai_family;
if (family == req->ai_family)
memcpy ((*pat)->addr, h->h_addr_list[i],
h->h_length);
else
{
uint32_t *addr = (uint32_t *) (*pat)->addr;
addr[3] = *(uint32_t *) h->h_addr_list[i];
addr[2] = htonl (0xffff);
addr[1] = 0;
addr[0] = 0;
}
pat = &((*pat)->next);
}
{
int i;
/* We found data, count the number of addresses. */
for (i = 0; h->h_addr_list[i]; ++i)
;
if (i > 0 && *pat != NULL)
--i;
if (__libc_use_alloca (alloca_used
+ i * sizeof (struct gaih_addrtuple)))
addrmem = alloca_account (i * sizeof (struct gaih_addrtuple),
alloca_used);
else
{
addrmem = malloc (i
* sizeof (struct gaih_addrtuple));
if (addrmem == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
malloc_addrmem = true;
}
/* Now convert it into the list. */
struct gaih_addrtuple *addrfree = addrmem;
for (i = 0; h->h_addr_list[i]; ++i)
{
if (*pat == NULL)
{
*pat = addrfree++;
(*pat)->scopeid = 0;
}
(*pat)->next = NULL;
(*pat)->family = req->ai_family;
if (family == req->ai_family)
memcpy ((*pat)->addr, h->h_addr_list[i],
h->h_length);
else
{
uint32_t *addr = (uint32_t *) (*pat)->addr;
addr[3] = *(uint32_t *) h->h_addr_list[i];
addr[2] = htonl (0xffff);
addr[1] = 0;
addr[0] = 0;
}
pat = &((*pat)->next);
}
}
}
else
{
if (herrno == NETDB_INTERNAL)
{
__set_h_errno (herrno);
return -EAI_SYSTEM;
result = -EAI_SYSTEM;
}
if (herrno == TRY_AGAIN)
{
return -EAI_AGAIN;
}
/* We made requests but they turned out no data.
The name is known, though. */
return GAIH_OKIFUNSPEC | -EAI_NODATA;
else if (herrno == TRY_AGAIN)
result = -EAI_AGAIN;
else
/* We made requests but they turned out no data.
The name is known, though. */
result = GAIH_OKIFUNSPEC | -EAI_NODATA;
goto free_and_return;
}
goto process_list;
@ -596,21 +692,56 @@ gaih_inet (const char *name, const struct gaih_service *service,
bool added_canon = (req->ai_flags & AI_CANONNAME) == 0;
char *addrs = air->addrs;
if (__libc_use_alloca (alloca_used
+ air->naddrs * sizeof (struct gaih_addrtuple)))
addrmem = alloca_account (air->naddrs
* sizeof (struct gaih_addrtuple),
alloca_used);
else
{
addrmem = malloc (air->naddrs
* sizeof (struct gaih_addrtuple));
if (addrmem == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
malloc_addrmem = true;
}
struct gaih_addrtuple *addrfree = addrmem;
for (int i = 0; i < air->naddrs; ++i)
{
socklen_t size = (air->family[i] == AF_INET
? INADDRSZ : IN6ADDRSZ);
if (*pat == NULL)
{
*pat = __alloca (sizeof (struct gaih_addrtuple));
*pat = addrfree++;
(*pat)->scopeid = 0;
}
uint32_t *pataddr = (*pat)->addr;
(*pat)->next = NULL;
if (added_canon || air->canon == NULL)
(*pat)->name = NULL;
else
canon = (*pat)->name = strdupa (air->canon);
else if (canonbuf == NULL)
{
size_t canonlen = strlen (air->canon) + 1;
if ((req->ai_flags & AI_CANONIDN) != 0
&& __libc_use_alloca (alloca_used + canonlen))
canonbuf = alloca_account (canonlen, alloca_used);
else
{
canonbuf = malloc (canonlen);
if (canonbuf == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
malloc_canonbuf = true;
}
canon = (*pat)->name = memcpy (canonbuf, air->canon,
canonlen);
}
if (air->family[i] == AF_INET
&& req->ai_family == AF_INET6
@ -640,20 +771,26 @@ gaih_inet (const char *name, const struct gaih_service *service,
free (air);
if (at->family == AF_UNSPEC)
return GAIH_OKIFUNSPEC | -EAI_NONAME;
{
result = GAIH_OKIFUNSPEC | -EAI_NONAME;
goto free_and_return;
}
goto process_list;
}
else if (err == 0)
/* The database contains a negative entry. */
return 0;
goto free_and_return;
else if (__nss_not_use_nscd_hosts == 0)
{
if (herrno == NETDB_INTERNAL && errno == ENOMEM)
return -EAI_MEMORY;
if (herrno == TRY_AGAIN)
return -EAI_AGAIN;
return -EAI_SYSTEM;
result = -EAI_MEMORY;
else if (herrno == TRY_AGAIN)
result = -EAI_AGAIN;
else
result = -EAI_SYSTEM;
goto free_and_return;
}
}
#endif
@ -682,7 +819,19 @@ gaih_inet (const char *name, const struct gaih_service *service,
_res.options &= ~RES_USE_INET6;
size_t tmpbuflen = 1024;
char *tmpbuf = alloca (tmpbuflen);
malloc_tmpbuf = !__libc_use_alloca (alloca_used + tmpbuflen);
assert (tmpbuf == NULL);
if (malloc_tmpbuf)
tmpbuf = alloca_account (tmpbuflen, alloca_used);
else
{
tmpbuf = malloc (tmpbuflen);
if (tmpbuf == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
}
while (!no_more)
{
@ -711,8 +860,25 @@ gaih_inet (const char *name, const struct gaih_service *service,
no_data = herrno == NO_DATA;
break;
}
tmpbuf = extend_alloca (tmpbuf,
tmpbuflen, 2 * tmpbuflen);
if (!malloc_tmpbuf
&& __libc_use_alloca (alloca_used + 2 * tmpbuflen))
tmpbuf = extend_alloca_account (tmpbuf, tmpbuflen,
2 * tmpbuflen,
alloca_used);
else
{
char *newp = realloc (malloc_tmpbuf ? tmpbuf : NULL,
2 * tmpbuflen);
if (newp == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
tmpbuf = newp;
malloc_tmpbuf = true;
tmpbuflen = 2 * tmpbuflen;
}
}
no_inet6_data = no_data;
@ -787,18 +953,40 @@ gaih_inet (const char *name, const struct gaih_service *service,
if (cfct != NULL)
{
const size_t max_fqdn_len = 256;
char *buf = alloca (max_fqdn_len);
if ((req->ai_flags & AI_CANONIDN) != 0
&& __libc_use_alloca (alloca_used
+ max_fqdn_len))
canonbuf = alloca_account (max_fqdn_len,
alloca_used);
else
{
canonbuf = malloc (max_fqdn_len);
if (canonbuf == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
malloc_canonbuf = true;
}
char *s;
if (DL_CALL_FCT (cfct, (at->name ?: name,
buf, max_fqdn_len,
canonbuf,
max_fqdn_len,
&s, &rc, &herrno))
== NSS_STATUS_SUCCESS)
canon = s;
else
/* Set to name now to avoid using
gethostbyaddr. */
canon = name;
{
/* Set to name now to avoid using
gethostbyaddr. */
if (malloc_canonbuf)
{
free (canonbuf);
malloc_canonbuf = false;
}
canon = name;
}
}
}
status = NSS_STATUS_SUCCESS;
@ -833,22 +1021,27 @@ gaih_inet (const char *name, const struct gaih_service *service,
{
/* If both requests timed out report this. */
if (no_data == EAI_AGAIN && no_inet6_data == EAI_AGAIN)
return -EAI_AGAIN;
result = -EAI_AGAIN;
else
/* We made requests but they turned out no data. The name
is known, though. */
result = GAIH_OKIFUNSPEC | -EAI_NODATA;
/* We made requests but they turned out no data. The name
is known, though. */
return GAIH_OKIFUNSPEC | -EAI_NODATA;
goto free_and_return;
}
}
process_list:
if (at->family == AF_UNSPEC)
return GAIH_OKIFUNSPEC | -EAI_NONAME;
{
result = GAIH_OKIFUNSPEC | -EAI_NONAME;
goto free_and_return;
}
}
else
{
struct gaih_addrtuple *atr;
atr = at = __alloca (sizeof (struct gaih_addrtuple));
atr = at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used);
memset (at, '\0', sizeof (struct gaih_addrtuple));
if (req->ai_family == AF_UNSPEC)
@ -887,30 +1080,56 @@ gaih_inet (const char *name, const struct gaih_service *service,
/* Only the first entry gets the canonical name. */
if (at2 == at && (req->ai_flags & AI_CANONNAME) != 0)
{
char *tmpbuf2 = NULL;
bool malloc_tmpbuf2 = false;
if (canon == NULL)
{
struct hostent *h = NULL;
int herrno;
struct hostent th;
size_t tmpbuflen = 512;
char *tmpbuf = NULL;
size_t tmpbuf2len = 512;
do
{
tmpbuf = extend_alloca (tmpbuf, tmpbuflen, tmpbuflen * 2);
if (__libc_use_alloca (alloca_used + 2 * tmpbuf2len))
tmpbuf2 = extend_alloca_account (tmpbuf2, tmpbuf2len,
tmpbuf2len * 2,
alloca_used);
else
{
char *newp = realloc (malloc_tmpbuf2 ? tmpbuf2 : NULL,
2 * tmpbuf2len);
if (newp == NULL)
{
if (malloc_tmpbuf2)
free (tmpbuf2);
result = -EAI_MEMORY;
goto free_and_return;
}
tmpbuf2 = newp;
tmpbuf2len = 2 * tmpbuf2len;
malloc_tmpbuf2 = true;
}
rc = __gethostbyaddr_r (at2->addr,
((at2->family == AF_INET6)
? sizeof (struct in6_addr)
: sizeof (struct in_addr)),
at2->family, &th, tmpbuf,
tmpbuflen, &h, &herrno);
at2->family, &th, tmpbuf2,
tmpbuf2len, &h, &herrno);
}
while (rc == ERANGE && herrno == NETDB_INTERNAL);
if (rc != 0 && herrno == NETDB_INTERNAL)
{
if (malloc_tmpbuf2)
free (tmpbuf2);
__set_h_errno (herrno);
return -EAI_SYSTEM;
result = -EAI_SYSTEM;
goto free_and_return;
}
if (h != NULL)
@ -937,11 +1156,16 @@ gaih_inet (const char *name, const struct gaih_service *service,
int rc = __idna_to_unicode_lzlz (canon, &out, idn_flags);
if (rc != IDNA_SUCCESS)
{
if (malloc_tmpbuf2)
free (tmpbuf2);
if (rc == IDNA_MALLOC_ERROR)
return -EAI_MEMORY;
if (rc == IDNA_DLOPEN_ERROR)
return -EAI_SYSTEM;
return -EAI_IDN_ENCODE;
result = -EAI_MEMORY;
else if (rc == IDNA_DLOPEN_ERROR)
result = -EAI_SYSTEM;
else
result = -EAI_IDN_ENCODE;
goto free_and_return;
}
/* In case the output string is the same as the input
string no new string has been allocated and we
@ -956,10 +1180,25 @@ gaih_inet (const char *name, const struct gaih_service *service,
#ifdef HAVE_LIBIDN
make_copy:
#endif
canon = strdup (canon);
if (canon == NULL)
return -EAI_MEMORY;
if (malloc_canonbuf)
/* We already allocated the string using malloc. */
malloc_canonbuf = false;
else
{
canon = strdup (canon);
if (canon == NULL)
{
if (malloc_tmpbuf2)
free (tmpbuf2);
result = -EAI_MEMORY;
goto free_and_return;
}
}
}
if (malloc_tmpbuf2)
free (tmpbuf2);
}
family = at2->family;
@ -985,7 +1224,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
if (ai == NULL)
{
free ((char *) canon);
return -EAI_MEMORY;
result = -EAI_MEMORY;
goto free_and_return;
}
ai->ai_flags = req->ai_flags;
@ -1038,7 +1278,18 @@ gaih_inet (const char *name, const struct gaih_service *service,
at2 = at2->next;
}
}
return 0;
free_and_return:
if (malloc_name)
free ((char *) name);
if (malloc_addrmem)
free (addrmem);
if (malloc_canonbuf)
free (canonbuf);
if (malloc_tmpbuf)
free (tmpbuf);
return result;
}