diff options
Diffstat (limited to 'source/l/glibc/patches/glibc.CVE-2021-3998.patch')
| -rw-r--r-- | source/l/glibc/patches/glibc.CVE-2021-3998.patch | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/source/l/glibc/patches/glibc.CVE-2021-3998.patch b/source/l/glibc/patches/glibc.CVE-2021-3998.patch new file mode 100644 index 000000000..45602d050 --- /dev/null +++ b/source/l/glibc/patches/glibc.CVE-2021-3998.patch @@ -0,0 +1,123 @@ +From f7a79879c0b2bef0dadd6caaaeeb0d26423e04e5 Mon Sep 17 00:00:00 2001 +From: Siddhesh Poyarekar <siddhesh@sourceware.org> +Date: Thu, 13 Jan 2022 11:28:36 +0530 +Subject: [PATCH] realpath: Set errno to ENAMETOOLONG for result larger than + PATH_MAX [BZ #28770] + +realpath returns an allocated string when the result exceeds PATH_MAX, +which is unexpected when its second argument is not NULL. This results +in the second argument (resolved) being uninitialized and also results +in a memory leak since the caller expects resolved to be the same as the +returned value. + +Return NULL and set errno to ENAMETOOLONG if the result exceeds +PATH_MAX. This fixes [BZ #28770], which is CVE-2021-3998. + +Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> +Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> +(cherry picked from commit ee8d5e33adb284601c00c94687bc907e10aec9bb) +--- + NEWS | 4 +++ + stdlib/Makefile | 1 + + stdlib/canonicalize.c | 12 +++++++-- + stdlib/tst-realpath-toolong.c | 49 +++++++++++++++++++++++++++++++++++ + 4 files changed, 64 insertions(+), 2 deletions(-) + create mode 100644 stdlib/tst-realpath-toolong.c + +--- ./NEWS.orig 2021-02-01 11:15:33.000000000 -0600 ++++ ./NEWS 2022-01-24 13:32:24.268678228 -0600 +@@ -118,6 +118,10 @@ + CVE-2019-25013: A buffer overflow has been fixed in the iconv function when + invoked with EUC-KR input containing invalid multibyte input sequences. + ++ CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath ++ function could result in a memory leak and potential access of ++ uninitialized memory. Reported by Qualys. ++ + The following bugs are resolved with this release: + + [10635] libc: realpath portability patches +--- ./stdlib/canonicalize.c.orig 2021-02-01 11:15:33.000000000 -0600 ++++ ./stdlib/canonicalize.c 2022-01-24 13:32:24.268678228 -0600 +@@ -400,8 +400,16 @@ + + error: + *dest++ = '\0'; +- if (resolved != NULL && dest - rname <= get_path_max ()) +- rname = strcpy (resolved, rname); ++ if (resolved != NULL) ++ { ++ if (dest - rname <= get_path_max ()) ++ rname = strcpy (resolved, rname); ++ else ++ { ++ failed = true; ++ __set_errno (ENAMETOOLONG); ++ } ++ } + + error_nomem: + scratch_buffer_free (&extra_buffer); +--- ./stdlib/Makefile.orig 2022-01-24 13:32:24.268678228 -0600 ++++ ./stdlib/Makefile 2022-01-24 13:32:59.968676254 -0600 +@@ -86,7 +86,7 @@ + tst-makecontext-align test-bz22786 tst-strtod-nan-sign \ + tst-swapcontext1 tst-setcontext4 tst-setcontext5 \ + tst-setcontext6 tst-setcontext7 tst-setcontext8 \ +- tst-setcontext9 tst-bz20544 tst-canon-bz26341 ++ tst-setcontext9 tst-bz20544 tst-canon-bz26341 tst-realpath-toolong + + tests-internal := tst-strtod1i tst-strtod3 tst-strtod4 tst-strtod5i \ + tst-tls-atexit tst-tls-atexit-nodelete +--- ./stdlib/tst-realpath-toolong.c.orig 2022-01-24 13:32:24.268678228 -0600 ++++ ./stdlib/tst-realpath-toolong.c 2022-01-24 13:32:24.268678228 -0600 +@@ -0,0 +1,49 @@ ++/* Verify that realpath returns NULL with ENAMETOOLONG if the result exceeds ++ NAME_MAX. ++ Copyright The GNU Toolchain Authors. ++ This file is part of the GNU C Library. ++ ++ The GNU C Library is free software; you can redistribute it and/or ++ modify it under the terms of the GNU Lesser General Public ++ License as published by the Free Software Foundation; either ++ version 2.1 of the License, or (at your option) any later version. ++ ++ The GNU C Library is distributed in the hope that it will be useful, ++ but WITHOUT ANY WARRANTY; without even the implied warranty of ++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ++ Lesser General Public License for more details. ++ ++ You should have received a copy of the GNU Lesser General Public ++ License along with the GNU C Library; if not, see ++ <https://www.gnu.org/licenses/>. */ ++ ++#include <errno.h> ++#include <limits.h> ++#include <stdlib.h> ++#include <string.h> ++#include <unistd.h> ++#include <support/check.h> ++#include <support/temp_file.h> ++#include <sys/types.h> ++#include <sys/stat.h> ++ ++#define BASENAME "tst-realpath-toolong." ++ ++int ++do_test (void) ++{ ++ char *base = support_create_and_chdir_toolong_temp_directory (BASENAME); ++ ++ char buf[PATH_MAX + 1]; ++ const char *res = realpath (".", buf); ++ ++ /* canonicalize.c states that if the real path is >= PATH_MAX, then ++ realpath returns NULL and sets ENAMETOOLONG. */ ++ TEST_VERIFY (res == NULL); ++ TEST_VERIFY (errno == ENAMETOOLONG); ++ ++ free (base); ++ return 0; ++} ++ ++#include <support/test-driver.c> |