diff options
Diffstat (limited to 'meta')
3 files changed, 535 insertions, 0 deletions
diff --git a/meta/recipes-core/eglibc/eglibc-2.19/CVE-2012-3406-Stack-overflow-in-vfprintf-BZ-16617.patch b/meta/recipes-core/eglibc/eglibc-2.19/CVE-2012-3406-Stack-overflow-in-vfprintf-BZ-16617.patch new file mode 100644 index 0000000000..c94e68266e --- /dev/null +++ b/meta/recipes-core/eglibc/eglibc-2.19/CVE-2012-3406-Stack-overflow-in-vfprintf-BZ-16617.patch @@ -0,0 +1,317 @@ +From a5357b7ce2a2982c5778435704bcdb55ce3667a0 Mon Sep 17 00:00:00 2001 +From: Jeff Law <law@redhat.com> +Date: Mon, 15 Dec 2014 10:09:32 +0100 +Subject: [PATCH] CVE-2012-3406: Stack overflow in vfprintf [BZ #16617] + +A larger number of format specifiers coudld cause a stack overflow, +potentially allowing to bypass _FORTIFY_SOURCE format string +protection. +--- + ChangeLog | 9 +++++++ + NEWS | 13 +++++---- + stdio-common/Makefile | 2 +- + stdio-common/bug23-2.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++ + stdio-common/bug23-3.c | 50 +++++++++++++++++++++++++++++++++++ + stdio-common/bug23-4.c | 31 ++++++++++++++++++++++ + stdio-common/vfprintf.c | 40 ++++++++++++++++++++++++++-- + 7 files changed, 207 insertions(+), 8 deletions(-) + create mode 100644 stdio-common/bug23-2.c + create mode 100644 stdio-common/bug23-3.c + create mode 100644 stdio-common/bug23-4.c + +Index: libc/ChangeLog +=================================================================== +--- libc.orig/ChangeLog ++++ libc/ChangeLog +@@ -1,3 +1,12 @@ ++2014-12-15 Jeff Law <law@redhat.com> ++ ++ [BZ #16617] ++ * stdio-common/vfprintf.c (vfprintf): Allocate large specs array ++ on the heap. (CVE-2012-3406) ++ * stdio-common/bug23-2.c, stdio-common/bug23-3.c: New file. ++ * stdio-common/bug23-4.c: New file. Test case by Joseph Myers. ++ * stdio-common/Makefile (tests): Add bug23-2, bug23-3, bug23-4. ++ + 2014-11-19 Carlos O'Donell <carlos@redhat.com> + Florian Weimer <fweimer@redhat.com> + Joseph Myers <joseph@codesourcery.com> +Index: libc/NEWS +=================================================================== +--- libc.orig/NEWS ++++ libc/NEWS +@@ -26,7 +26,7 @@ Version 2.19 + 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338, + 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16384, 16385, 16386, + 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430, 16431, +- 16453, 16474, 16506, 16510, 16529, 17187, 17625. ++ 16453, 16474, 16506, 16510, 16529, 16619, 17187, 17625. + + * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag + under certain input conditions resulting in the execution of a shell for +@@ -34,6 +34,9 @@ Version 2.19 + implementation now checks WRDE_NOCMD immediately before executing the + shell and returns the error WRDE_CMDSUB as expected. + ++* CVE-2012-3406 printf-style functions could run into a stack overflow when ++ processing format strings with a large number of format specifiers. ++ + * Slovenian translations for glibc messages have been contributed by the + Translation Project's Slovenian team of translators. + +Index: libc/stdio-common/bug23-2.c +=================================================================== +--- /dev/null ++++ libc/stdio-common/bug23-2.c +@@ -0,0 +1,70 @@ ++#include <stdio.h> ++#include <string.h> ++#include <stdlib.h> ++ ++static const char expected[] = "\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55\ ++\n\ ++a\n\ ++abbcd55%%%%%%%%%%%%%%%%%%%%%%%%%%\n"; ++ ++static int ++do_test (void) ++{ ++ char *buf = malloc (strlen (expected) + 1); ++ snprintf (buf, strlen (expected) + 1, ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n", ++ "a", "b", "c", "d", 5); ++ return strcmp (buf, expected) != 0; ++} ++ ++#define TEST_FUNCTION do_test () ++#include "../test-skeleton.c" +Index: libc/stdio-common/bug23-3.c +=================================================================== +--- /dev/null ++++ libc/stdio-common/bug23-3.c +@@ -0,0 +1,50 @@ ++#include <stdio.h> ++#include <string.h> ++#include <stdlib.h> ++ ++int ++do_test (void) ++{ ++ size_t instances = 16384; ++#define X0 "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d" ++ const char *item = "\na\nabbcd55"; ++#define X3 X0 X0 X0 X0 X0 X0 X0 X0 ++#define X6 X3 X3 X3 X3 X3 X3 X3 X3 ++#define X9 X6 X6 X6 X6 X6 X6 X6 X6 ++#define X12 X9 X9 X9 X9 X9 X9 X9 X9 ++#define X14 X12 X12 X12 X12 ++#define TRAILER "%%%%%%%%%%%%%%%%%%%%%%%%%%" ++#define TRAILER2 TRAILER TRAILER ++ size_t length = instances * strlen (item) + strlen (TRAILER) + 1; ++ ++ char *buf = malloc (length + 1); ++ snprintf (buf, length + 1, ++ X14 TRAILER2 "\n", ++ "a", "b", "c", "d", 5); ++ ++ const char *p = buf; ++ size_t i; ++ for (i = 0; i < instances; ++i) ++ { ++ const char *expected; ++ for (expected = item; *expected; ++expected) ++ { ++ if (*p != *expected) ++ { ++ printf ("mismatch at offset %zu (%zu): expected %d, got %d\n", ++ (size_t) (p - buf), i, *expected & 0xFF, *p & 0xFF); ++ return 1; ++ } ++ ++p; ++ } ++ } ++ if (strcmp (p, TRAILER "\n") != 0) ++ { ++ printf ("mismatch at trailer: [%s]\n", p); ++ return 1; ++ } ++ free (buf); ++ return 0; ++} ++#define TEST_FUNCTION do_test () ++#include "../test-skeleton.c" +Index: libc/stdio-common/bug23-4.c +=================================================================== +--- /dev/null ++++ libc/stdio-common/bug23-4.c +@@ -0,0 +1,31 @@ ++#include <stdio.h> ++#include <stdlib.h> ++#include <string.h> ++#include <sys/resource.h> ++ ++#define LIMIT 1000000 ++ ++int ++main (void) ++{ ++ struct rlimit lim; ++ getrlimit (RLIMIT_STACK, &lim); ++ lim.rlim_cur = 1048576; ++ setrlimit (RLIMIT_STACK, &lim); ++ char *fmtstr = malloc (4 * LIMIT + 1); ++ if (fmtstr == NULL) ++ abort (); ++ char *output = malloc (LIMIT + 1); ++ if (output == NULL) ++ abort (); ++ for (size_t i = 0; i < LIMIT; i++) ++ memcpy (fmtstr + 4 * i, "%1$d", 4); ++ fmtstr[4 * LIMIT] = '\0'; ++ int ret = snprintf (output, LIMIT + 1, fmtstr, 0); ++ if (ret != LIMIT) ++ abort (); ++ for (size_t i = 0; i < LIMIT; i++) ++ if (output[i] != '0') ++ abort (); ++ return 0; ++} +Index: libc/stdio-common/vfprintf.c +=================================================================== +--- libc.orig/stdio-common/vfprintf.c ++++ libc/stdio-common/vfprintf.c +@@ -276,6 +276,12 @@ vfprintf (FILE *s, const CHAR_T *format, + /* For the argument descriptions, which may be allocated on the heap. */ + void *args_malloced = NULL; + ++ /* For positional argument handling. */ ++ struct printf_spec *specs; ++ ++ /* Track if we malloced the SPECS array and thus must free it. */ ++ bool specs_malloced = false; ++ + /* This table maps a character into a number representing a + class. In each step there is a destination label for each + class. */ +@@ -1698,8 +1704,8 @@ do_positional: + size_t nspecs = 0; + /* A more or less arbitrary start value. */ + size_t nspecs_size = 32 * sizeof (struct printf_spec); +- struct printf_spec *specs = alloca (nspecs_size); + ++ specs = alloca (nspecs_size); + /* The number of arguments the format string requests. This will + determine the size of the array needed to store the argument + attributes. */ +@@ -1742,11 +1748,39 @@ do_positional: + if (nspecs * sizeof (*specs) >= nspecs_size) + { + /* Extend the array of format specifiers. */ ++ if (nspecs_size * 2 < nspecs_size) ++ { ++ __set_errno (ENOMEM); ++ done = -1; ++ goto all_done; ++ } + struct printf_spec *old = specs; +- specs = extend_alloca (specs, nspecs_size, 2 * nspecs_size); ++ if (__libc_use_alloca (2 * nspecs_size)) ++ specs = extend_alloca (specs, nspecs_size, 2 * nspecs_size); ++ else ++ { ++ nspecs_size *= 2; ++ specs = malloc (nspecs_size); ++ if (specs == NULL) ++ { ++ __set_errno (ENOMEM); ++ specs = old; ++ done = -1; ++ goto all_done; ++ } ++ } + + /* Copy the old array's elements to the new space. */ + memmove (specs, old, nspecs * sizeof (*specs)); ++ ++ /* If we had previously malloc'd space for SPECS, then ++ release it after the copy is complete. */ ++ if (specs_malloced) ++ free (old); ++ ++ /* Now set SPECS_MALLOCED if needed. */ ++ if (!__libc_use_alloca (nspecs_size)) ++ specs_malloced = true; + } + + /* Parse the format specifier. */ +@@ -2067,6 +2101,8 @@ do_positional: + } + + all_done: ++ if (specs_malloced) ++ free (specs); + if (__glibc_unlikely (args_malloced != NULL)) + free (args_malloced); + if (__glibc_unlikely (workstart != NULL)) +Index: libc/stdio-common/Makefile +=================================================================== +--- libc.orig/stdio-common/Makefile ++++ libc/stdio-common/Makefile +@@ -64,7 +64,7 @@ tests := tstscanf test_rdwr test-popen t + tst-fwrite bug16 bug17 tst-sprintf2 bug18 \ + bug19 tst-popen2 scanf14 scanf15 bug21 bug22 scanf16 scanf17 \ + tst-setvbuf1 bug23 bug24 bug-vfprintf-nargs tst-sprintf3 bug25 \ +- tst-printf-round bug26 ++ tst-printf-round bug23-2 bug23-3 bug23-4 + tests-$(OPTION_EGLIBC_LOCALE_CODE) \ + += tst-sscanf tst-swprintf test-vfprintf bug14 scanf13 tst-grouping + tests-$(OPTION_POSIX_WIDE_CHAR_DEVICE_IO) \ diff --git a/meta/recipes-core/eglibc/eglibc-2.19/CVE-2014-7817-wordexp-fails-to-honour-WRDE_NOCMD.patch b/meta/recipes-core/eglibc/eglibc-2.19/CVE-2014-7817-wordexp-fails-to-honour-WRDE_NOCMD.patch new file mode 100644 index 0000000000..2741ce621b --- /dev/null +++ b/meta/recipes-core/eglibc/eglibc-2.19/CVE-2014-7817-wordexp-fails-to-honour-WRDE_NOCMD.patch @@ -0,0 +1,216 @@ +From a39208bd7fb76c1b01c127b4c61f9bfd915bfe7c Mon Sep 17 00:00:00 2001 +From: Carlos O'Donell <carlos@redhat.com> +Date: Wed, 19 Nov 2014 11:44:12 -0500 +Subject: [PATCH] CVE-2014-7817: wordexp fails to honour WRDE_NOCMD. + +The function wordexp() fails to properly handle the WRDE_NOCMD +flag when processing arithmetic inputs in the form of "$((... ``))" +where "..." can be anything valid. The backticks in the arithmetic +epxression are evaluated by in a shell even if WRDE_NOCMD forbade +command substitution. This allows an attacker to attempt to pass +dangerous commands via constructs of the above form, and bypass +the WRDE_NOCMD flag. This patch fixes this by checking for WRDE_NOCMD +in exec_comm(), the only place that can execute a shell. All other +checks for WRDE_NOCMD are superfluous and removed. + +We expand the testsuite and add 3 new regression tests of roughly +the same form but with a couple of nested levels. + +On top of the 3 new tests we add fork validation to the WRDE_NOCMD +testing. If any forks are detected during the execution of a wordexp() +call with WRDE_NOCMD, the test is marked as failed. This is slightly +heuristic since vfork might be used in the future, but it provides a +higher level of assurance that no shells were executed as part of +command substitution with WRDE_NOCMD in effect. In addition it doesn't +require libpthread or libdl, instead we use the public implementation +namespace function __register_atfork (already part of the public ABI +for libpthread). + +Tested on x86_64 with no regressions. +--- + ChangeLog | 22 ++++++++++++++++++++++ + NEWS | 8 +++++++- + posix/wordexp-test.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ + posix/wordexp.c | 16 ++++------------ + 4 files changed, 77 insertions(+), 13 deletions(-) + +Index: libc/ChangeLog +=================================================================== +--- libc.orig/ChangeLog ++++ libc/ChangeLog +@@ -1,3 +1,25 @@ ++2014-11-19 Carlos O'Donell <carlos@redhat.com> ++ Florian Weimer <fweimer@redhat.com> ++ Joseph Myers <joseph@codesourcery.com> ++ Adam Conrad <adconrad@0c3.net> ++ Andreas Schwab <schwab@suse.de> ++ Brooks <bmoses@google.com> ++ ++ [BZ #17625] ++ * wordexp-test.c (__dso_handle): Add prototype. ++ (__register_atfork): Likewise. ++ (__app_register_atfork): New function. ++ (registered_forks): New global. ++ (register_fork): New function. ++ (test_case): Add 3 new tests for WRDE_CMDSUB. ++ (main): Call __app_register_atfork. ++ (testit): If WRDE_NOCMD set registered_forks to zero, run test, and if ++ fork count is non-zero fail the test. ++ * posix/wordexp.c (exec_comm): Return WRDE_CMDSUB if WRDE_NOCMD flag ++ is set. ++ (parse_dollars): Remove check for WRDE_NOCMD. ++ (parse_dquote): Likewise. ++ + 2014-08-26 Florian Weimer <fweimer@redhat.com> + + [BZ #17187] +Index: libc/posix/wordexp-test.c +=================================================================== +--- libc.orig/posix/wordexp-test.c ++++ libc/posix/wordexp-test.c +@@ -27,6 +27,25 @@ + + #define IFS " \n\t" + ++extern void *__dso_handle __attribute__ ((__weak__, __visibility__ ("hidden"))); ++extern int __register_atfork (void (*) (void), void (*) (void), void (*) (void), void *); ++ ++static int __app_register_atfork (void (*prepare) (void), void (*parent) (void), void (*child) (void)) ++{ ++ return __register_atfork (prepare, parent, child, ++ &__dso_handle == NULL ? NULL : __dso_handle); ++} ++ ++/* Number of forks seen. */ ++static int registered_forks; ++ ++/* For each fork increment the fork count. */ ++static void ++register_fork (void) ++{ ++ registered_forks++; ++} ++ + struct test_case_struct + { + int retval; +@@ -206,6 +225,12 @@ struct test_case_struct + { WRDE_SYNTAX, NULL, "$((2+))", 0, 0, { NULL, }, IFS }, + { WRDE_SYNTAX, NULL, "`", 0, 0, { NULL, }, IFS }, + { WRDE_SYNTAX, NULL, "$((010+4+))", 0, 0, { NULL }, IFS }, ++ /* Test for CVE-2014-7817. We test 3 combinations of command ++ substitution inside an arithmetic expression to make sure that ++ no commands are executed and error is returned. */ ++ { WRDE_CMDSUB, NULL, "$((`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS }, ++ { WRDE_CMDSUB, NULL, "$((1+`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS }, ++ { WRDE_CMDSUB, NULL, "$((1+$((`echo 1`))))", WRDE_NOCMD, 0, { NULL, }, IFS }, + + { -1, NULL, NULL, 0, 0, { NULL, }, IFS }, + }; +@@ -258,6 +283,15 @@ main (int argc, char *argv[]) + return -1; + } + ++ /* If we are not allowed to do command substitution, we install ++ fork handlers to verify that no forks happened. No forks should ++ happen at all if command substitution is disabled. */ ++ if (__app_register_atfork (register_fork, NULL, NULL) != 0) ++ { ++ printf ("Failed to register fork handler.\n"); ++ return -1; ++ } ++ + for (test = 0; test_case[test].retval != -1; test++) + if (testit (&test_case[test])) + ++fail; +@@ -367,6 +401,9 @@ testit (struct test_case_struct *tc) + + printf ("Test %d (%s): ", ++tests, tc->words); + ++ if (tc->flags & WRDE_NOCMD) ++ registered_forks = 0; ++ + if (tc->flags & WRDE_APPEND) + { + /* initial wordexp() call, to be appended to */ +@@ -378,6 +415,13 @@ testit (struct test_case_struct *tc) + } + retval = wordexp (tc->words, &we, tc->flags); + ++ if ((tc->flags & WRDE_NOCMD) ++ && (registered_forks > 0)) ++ { ++ printf ("FAILED fork called for WRDE_NOCMD\n"); ++ return 1; ++ } ++ + if (tc->flags & WRDE_DOOFFS) + start_offs = sav_we.we_offs; + +Index: libc/posix/wordexp.c +=================================================================== +--- libc.orig/posix/wordexp.c ++++ libc/posix/wordexp.c +@@ -893,6 +893,10 @@ exec_comm (char *comm, char **word, size + pid_t pid; + int noexec = 0; + ++ /* Do nothing if command substitution should not succeed. */ ++ if (flags & WRDE_NOCMD) ++ return WRDE_CMDSUB; ++ + /* Don't fork() unless necessary */ + if (!comm || !*comm) + return 0; +@@ -2082,9 +2086,6 @@ parse_dollars (char **word, size_t *word + } + } + +- if (flags & WRDE_NOCMD) +- return WRDE_CMDSUB; +- + (*offset) += 2; + return parse_comm (word, word_length, max_length, words, offset, flags, + quoted? NULL : pwordexp, ifs, ifs_white); +@@ -2196,9 +2197,6 @@ parse_dquote (char **word, size_t *word_ + break; + + case '`': +- if (flags & WRDE_NOCMD) +- return WRDE_CMDSUB; +- + ++(*offset); + error = parse_backtick (word, word_length, max_length, words, + offset, flags, NULL, NULL, NULL); +@@ -2357,12 +2355,6 @@ wordexp (const char *words, wordexp_t *p + break; + + case '`': +- if (flags & WRDE_NOCMD) +- { +- error = WRDE_CMDSUB; +- goto do_error; +- } +- + ++words_offset; + error = parse_backtick (&word, &word_length, &max_length, words, + &words_offset, flags, pwordexp, ifs, +Index: libc/NEWS +=================================================================== +--- libc.orig/NEWS ++++ libc/NEWS +@@ -26,7 +26,13 @@ Version 2.19 + 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338, + 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16384, 16385, 16386, + 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430, 16431, +- 16453, 16474, 16506, 16510, 16529, 17187 ++ 16453, 16474, 16506, 16510, 16529, 17187, 17625. ++ ++* CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag ++ under certain input conditions resulting in the execution of a shell for ++ command substitution when the applicaiton did not request it. The ++ implementation now checks WRDE_NOCMD immediately before executing the ++ shell and returns the error WRDE_CMDSUB as expected. + + * Slovenian translations for glibc messages have been contributed by the + Translation Project's Slovenian team of translators. diff --git a/meta/recipes-core/eglibc/eglibc_2.19.bb b/meta/recipes-core/eglibc/eglibc_2.19.bb index 090cfe6fa0..a15573c4d1 100644 --- a/meta/recipes-core/eglibc/eglibc_2.19.bb +++ b/meta/recipes-core/eglibc/eglibc_2.19.bb @@ -27,6 +27,8 @@ SRC_URI = "http://downloads.yoctoproject.org/releases/eglibc/eglibc-${PV}-svnr25 file://ppce6500-32b_slow_ieee754_sqrt.patch \ file://grok_gold.patch \ file://CVE-2014-5119.patch \ + file://CVE-2014-7817-wordexp-fails-to-honour-WRDE_NOCMD.patch \ + file://CVE-2012-3406-Stack-overflow-in-vfprintf-BZ-16617.patch \ " SRC_URI[md5sum] = "197836c2ba42fb146e971222647198dd" SRC_URI[sha256sum] = "baaa030531fc308f7820c46acdf8e1b2f8e3c1f40bcd28b6e440d1c95d170d4c" |