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Fix BZ #17905

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This commit is contained in:
Paul Pluzhnikov 2015-08-08 15:53:03 -07:00
parent 74bc0c3a16
commit 0f58539030
6 changed files with 74 additions and 18 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2015-08-08 Paul Pluzhnikov <ppluzhnikov@google.com>
[BZ #17905]
* catgets/Makefile (tst-catgets-mem): New test.
* catgets/catgets.c (catopen): Don't use unbounded alloca.
* catgets/open_catalog.c (__open_catalog): Likewise.
* catgets/tst-catgets.c (do_bz17905): Test unbounded alloca.
2015-08-08 John David Anglin <danglin@gcc.gnu.org>
[BZ #18787]

2
NEWS
View File

@ -8,7 +8,7 @@ using `glibc' in the "product" field.
Version 2.23
* The following bugs are resolved with this release:
16517, 16519, 18265, 18525, 18618, 18647, 18661, 18787.
16517, 16519, 17905, 18265, 18525, 18618, 18647, 18661, 18787.
Version 2.22

9
catgets/Makefile
View File

@ -34,6 +34,7 @@ test-srcs = test-gencat
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)de/libc.cat $(objpfx)test1.cat $(objpfx)test2.cat \
$(objpfx)sample.SJIS.cat $(objpfx)test-gencat.out
tests-special += $(objpfx)tst-catgets-mem.out
endif
gencat-modules = xmalloc
@ -50,9 +51,11 @@ catgets-CPPFLAGS := -DNLSPATH='"$(msgcatdir)/%L/%N:$(msgcatdir)/%L/LC_MESSAGES/%
generated += de.msg test1.cat test1.h test2.cat test2.h sample.SJIS.cat \
test-gencat.h
generated += tst-catgets.mtrace tst-catgets-mem.out
generated-dirs += de
tst-catgets-ENV = NLSPATH="$(objpfx)%l/%N.cat" LANG=de
tst-catgets-ENV = NLSPATH="$(objpfx)%l/%N.cat" LANG=de MALLOC_TRACE=$(objpfx)tst-catgets.mtrace
ifeq ($(run-built-tests),yes)
# This test just checks whether the program produces any error or not.
@ -86,4 +89,8 @@ $(objpfx)test-gencat.out: test-gencat.sh $(objpfx)test-gencat \
$(objpfx)sample.SJIS.cat: sample.SJIS $(objpfx)gencat
$(built-program-cmd) -H $(objpfx)test-gencat.h < $(word 1,$^) > $@; \
$(evaluate-test)
$(objpfx)tst-catgets-mem.out: $(objpfx)tst-catgets.out
$(common-objpfx)malloc/mtrace $(objpfx)tst-catgets.mtrace > $@; \
$(evaluate-test)
endif

19
catgets/catgets.c
View File

@ -16,7 +16,6 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <alloca.h>
#include <errno.h>
#include <locale.h>
#include <nl_types.h>
@ -35,6 +34,7 @@ catopen (const char *cat_name, int flag)
__nl_catd result;
const char *env_var = NULL;
const char *nlspath = NULL;
char *tmp = NULL;
if (strchr (cat_name, '/') == NULL)
{
@ -54,7 +54,10 @@ catopen (const char *cat_name, int flag)
{
/* Append the system dependent directory. */
size_t len = strlen (nlspath) + 1 + sizeof NLSPATH;
char *tmp = alloca (len);
tmp = malloc (len);
if (__glibc_unlikely (tmp == NULL))
return (nl_catd) -1;
__stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);
nlspath = tmp;
@ -65,16 +68,18 @@ catopen (const char *cat_name, int flag)
result = (__nl_catd) malloc (sizeof (*result));
if (result == NULL)
/* We cannot get enough memory. */
return (nl_catd) -1;
if (__open_catalog (cat_name, nlspath, env_var, result) != 0)
{
/* We cannot get enough memory. */
result = (nl_catd) -1;
}
else if (__open_catalog (cat_name, nlspath, env_var, result) != 0)
{
/* Couldn't open the file. */
free ((void *) result);
return (nl_catd) -1;
result = (nl_catd) -1;
}
free (tmp);
return (nl_catd) result;
}

23
catgets/open_catalog.c
View File

@ -47,6 +47,7 @@ __open_catalog (const char *cat_name, const char *nlspath, const char *env_var,
size_t tab_size;
const char *lastp;
int result = -1;
char *buf = NULL;
if (strchr (cat_name, '/') != NULL || nlspath == NULL)
fd = open_not_cancel_2 (cat_name, O_RDONLY);
@ -57,23 +58,23 @@ __open_catalog (const char *cat_name, const char *nlspath, const char *env_var,
if (__glibc_unlikely (bufact + (n) >= bufmax)) \
{ \
char *old_buf = buf; \
bufmax += 256 + (n); \
buf = (char *) alloca (bufmax); \
memcpy (buf, old_buf, bufact); \
bufmax += (bufmax < 256 + (n)) ? 256 + (n) : bufmax; \
buf = realloc (buf, bufmax); \
if (__glibc_unlikely (buf == NULL)) \
{ \
free (old_buf); \
return -1; \
} \
}
/* The RUN_NLSPATH variable contains a colon separated list of
descriptions where we expect to find catalogs. We have to
recognize certain % substitutions and stop when we found the
first existing file. */
char *buf;
size_t bufact;
size_t bufmax;
size_t bufmax = 0;
size_t len;
buf = NULL;
bufmax = 0;
fd = -1;
while (*run_nlspath != '\0')
{
@ -188,7 +189,10 @@ __open_catalog (const char *cat_name, const char *nlspath, const char *env_var,
/* Avoid dealing with directories and block devices */
if (__builtin_expect (fd, 0) < 0)
return -1;
{
free (buf);
return -1;
}
if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
goto close_unlock_return;
@ -325,6 +329,7 @@ __open_catalog (const char *cat_name, const char *nlspath, const char *env_var,
/* Release the lock again. */
close_unlock_return:
close_not_cancel_no_status (fd);
free (buf);
return result;
}

31
catgets/tst-catgets.c
View File

@ -1,7 +1,10 @@
#include <assert.h>
#include <mcheck.h>
#include <nl_types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
static const char *msgs[] =
@ -12,6 +15,33 @@ static const char *msgs[] =
};
#define nmsgs (sizeof (msgs) / sizeof (msgs[0]))
/* Test for unbounded alloca. */
static int
do_bz17905 (void)
{
char *buf;
struct rlimit rl;
nl_catd result;
const int sz = 1024 * 1024;
getrlimit (RLIMIT_STACK, &rl);
rl.rlim_cur = sz;
setrlimit (RLIMIT_STACK, &rl);
buf = malloc (sz + 1);
memset (buf, 'A', sz);
buf[sz] = '\0';
setenv ("NLSPATH", buf, 1);
result = catopen (buf, NL_CAT_LOCALE);
assert (result == (nl_catd) -1);
free (buf);
return 0;
}
#define ROUNDS 5
static int
@ -62,6 +92,7 @@ do_test (void)
}
}
result += do_bz17905 ();
return result;
}