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Handle long lines in host lookups in the right place.

This commit is contained in:
Ulrich Drepper 2011-01-13 11:28:17 -05:00
parent 0876917582
commit 451f001b50
5 changed files with 69 additions and 8 deletions
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6
ChangeLog
View File

@ -1,3 +1,9 @@
2011-01-13 Ulrich Drepper <drepper@gmail.com>
[BZ #10484]
* nss/nss_files/files-hosts.c (HOST_DB_LOOKUP): Handle overflows of
temporary buffer used to handle multi lookups locally.
2011-01-12 Ulrich Drepper <drepper@gmail.com>
* elf/dl-dst.h (DL_DST_REQUIRED): Allow l_origin to be NULL when

4
NEWS
View File

@ -1,4 +1,4 @@
GNU C Library NEWS -- history of user-visible changes. 2011-1-12
GNU C Library NEWS -- history of user-visible changes. 2011-1-13
Copyright (C) 1992-2009, 2010, 2011 Free Software Foundation, Inc.
See the end for copying conditions.
@ -9,7 +9,7 @@ Version 2.13
* The following bugs are resolved with this release:
3268, 7066, 10085, 10851, 11149, 11155, 11611, 11640, 11655, 11701,
3268, 7066, 10085, 10484, 10851, 11149, 11155, 11611, 11640, 11655, 11701,
11840, 11856, 11883, 11903, 11904, 11968, 11979, 12005, 12037,
12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113, 12140,
12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348, 12394

5
nptl/ChangeLog
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@ -1,3 +1,8 @@
2011-01-13 Ulrich Drepper <drepper@gmail.com>
[BZ #10484]
* Versions [libc] (GLIBC_PRIVATE): Export __libc_alloca_cutoff.
2010-10-13 H.J. Lu <hongjiu.lu@intel.com>
[BZ #12113]

1
nptl/Versions
View File

@ -27,6 +27,7 @@ libc {
pthread_cond_broadcast; pthread_cond_timedwait;
}
GLIBC_PRIVATE {
__libc_alloca_cutoff;
# Internal libc interface to libpthread
__libc_dl_error_tsd;
}

61
nss/nss_files/files-hosts.c
View File

@ -1,5 +1,5 @@
/* Hosts file parser in nss_files module.
Copyright (C) 1996-2001, 2003-2008, 2009 Free Software Foundation, Inc.
Copyright (C) 1996-2001, 2003-2009, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -129,19 +129,22 @@ _nss_files_get##name##_r (proto, \
&& _res_hconf.flags & HCONF_FLAG_MULTI) \
{ \
/* We have to get all host entries from the file. */ \
const size_t tmp_buflen = MIN (buflen, 4096); \
char tmp_buffer[tmp_buflen] \
size_t tmp_buflen = MIN (buflen, 4096); \
char tmp_buffer_stack[tmp_buflen] \
__attribute__ ((__aligned__ (__alignof__ (struct hostent_data))));\
char *tmp_buffer = tmp_buffer_stack; \
struct hostent tmp_result_buf; \
int naddrs = 1; \
int naliases = 0; \
char *bufferend; \
bool tmp_buffer_malloced = false; \
\
while (result->h_aliases[naliases] != NULL) \
++naliases; \
\
bufferend = (char *) &result->h_aliases[naliases + 1]; \
\
again: \
while ((status = internal_getent (&tmp_result_buf, tmp_buffer, \
tmp_buflen, errnop H_ERRNO_ARG \
EXTRA_ARGS_VALUE)) \
@ -182,7 +185,7 @@ _nss_files_get##name##_r (proto, \
} \
/* If the real name is different add it also to the \
aliases. This means that there is a duplication \
in the alias list but this is really the users \
in the alias list but this is really the user's \
problem. */ \
if (strcmp (old_result->h_name, \
tmp_result_buf.h_name) != 0) \
@ -204,7 +207,7 @@ _nss_files_get##name##_r (proto, \
*errnop = ERANGE; \
*herrnop = NETDB_INTERNAL; \
status = NSS_STATUS_TRYAGAIN; \
break; \
goto out; \
} \
\
new_h_addr_list = \
@ -268,8 +271,54 @@ _nss_files_get##name##_r (proto, \
} \
} \
\
if (status != NSS_STATUS_TRYAGAIN) \
if (status == NSS_STATUS_TRYAGAIN) \
{ \
size_t newsize = 2 * tmp_buflen; \
if (tmp_buffer_malloced) \
{ \
char *newp = realloc (tmp_buffer, newsize); \
if (newp != NULL) \
{ \
assert ((((uintptr_t) newp) \
& (__alignof__ (struct hostent_data) - 1)) \
== 0); \
tmp_buffer = newp; \
tmp_buflen = newsize; \
goto again; \
} \
} \
else if (!__libc_use_alloca (buflen + newsize)) \
{ \
tmp_buffer = malloc (newsize); \
if (tmp_buffer != NULL) \
{ \
assert ((((uintptr_t) tmp_buffer) \
& (__alignof__ (struct hostent_data) - 1)) \
== 0); \
tmp_buffer_malloced = true; \
tmp_buflen = newsize; \
goto again; \
} \
} \
else \
{ \
tmp_buffer \
= extend_alloca (tmp_buffer, tmp_buflen, \
newsize \
+ __alignof__ (struct hostent_data)); \
tmp_buffer = (char *) (((uintptr_t) tmp_buffer \
+ __alignof__ (struct hostent_data) \
- 1) \
& ~(__alignof__ (struct hostent_data)\
- 1)); \
goto again; \
} \
} \
else \
status = NSS_STATUS_SUCCESS; \
out: \
if (tmp_buffer_malloced) \
free (tmp_buffer); \
} \
\
\