From 0f58539030e436449f79189b6edab17d7479796e Mon Sep 17 00:00:00 2001 From: Paul Pluzhnikov Date: Sat, 8 Aug 2015 15:53:03 -0700 Subject: [PATCH] Fix BZ #17905 Upstream-Status: Backport CVE: CVE-2015-8779 [Yocto # 8980] https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0f58539030e436449f79189b6edab17d7479796e Signed-off-by: Armin Kuster --- ChangeLog | 8 ++++++++ NEWS | 2 +- catgets/Makefile | 9 ++++++++- catgets/catgets.c | 19 ++++++++++++------- catgets/open_catalog.c | 23 ++++++++++++++--------- catgets/tst-catgets.c | 31 +++++++++++++++++++++++++++++++ 6 files changed, 74 insertions(+), 18 deletions(-) Index: git/catgets/Makefile =================================================================== --- git.orig/catgets/Makefile +++ git/catgets/Makefile @@ -37,6 +37,7 @@ ifeq (y,$(OPTION_EGLIBC_CATGETS)) ifeq ($(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 += $(objpfx)tst-catgets-mem.out endif endif gencat-modules = xmalloc @@ -53,9 +54,11 @@ catgets-CPPFLAGS := -DNLSPATH='"$(msgcat 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. @@ -89,4 +92,8 @@ $(objpfx)test-gencat.out: test-gencat.sh $(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 Index: git/catgets/catgets.c =================================================================== --- git.orig/catgets/catgets.c +++ git/catgets/catgets.c @@ -16,7 +16,6 @@ License along with the GNU C Library; if not, see . */ -#include #include #include #include @@ -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; } Index: git/catgets/open_catalog.c =================================================================== --- git.orig/catgets/open_catalog.c +++ git/catgets/open_catalog.c @@ -47,6 +47,7 @@ __open_catalog (const char *cat_name, co 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, co 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, co /* 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, co /* Release the lock again. */ close_unlock_return: close_not_cancel_no_status (fd); + free (buf); return result; } Index: git/catgets/tst-catgets.c =================================================================== --- git.orig/catgets/tst-catgets.c +++ git/catgets/tst-catgets.c @@ -1,7 +1,10 @@ +#include #include #include #include +#include #include +#include 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; } Index: git/ChangeLog =================================================================== --- git.orig/ChangeLog +++ git/ChangeLog @@ -1,3 +1,11 @@ +2015-08-08 Paul Pluzhnikov + + [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. + 2015-10-15 Florian Weimer [BZ #18928] Index: git/NEWS =================================================================== --- git.orig/NEWS +++ git/NEWS @@ -9,7 +9,7 @@ Version 2.22.1 * The following bugs are resolved with this release: - 18778, 18781, 18787. + 18778, 18781, 18787, 17905. Version 2.22