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glibc: 2.25 -> 2.25-49

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Various fixes within, e.g. mutexes deadlocking sometimes.
https://sourceware.org/git/?p=glibc.git;a=blob;f=NEWS;h=f7057710f14d6c
This commit is contained in:
Vladimír Čunát 2017-09-02 16:49:43 +02:00
parent 0cdbd2d662
commit 51cf42ad0d
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GPG key ID: E747DF1F9575A3AA
7 changed files with 11 additions and 433 deletions
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209
pkgs/development/libraries/glibc/CVE-2017-1000366-rtld-LD_AUDIT.patch
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@ -1,209 +0,0 @@
From ba67ba3275d47e0080f0e5f09d9f5102c000c97e Mon Sep 17 00:00:00 2001
Message-Id: <ba67ba3275d47e0080f0e5f09d9f5102c000c97e.1495998948.git.fweimer@redhat.com>
In-Reply-To: <cover.1495998948.git.fweimer@redhat.com>
References: <cover.1495998948.git.fweimer@redhat.com>
From: Florian Weimer <fweimer@redhat.com>
Date: Sun, 28 May 2017 20:44:52 +0200
Subject: [PATCH 3/3] rtld: Reject overly long LD_AUDIT path elements
To: libc-alpha@sourceware.org
Also only process the last LD_AUDIT entry.
---
elf/rtld.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 95 insertions(+), 15 deletions(-)
diff --git a/elf/rtld.c b/elf/rtld.c
index 30f0cae..89d8573 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -116,13 +116,95 @@ dso_name_valid_for_suid (const char *p)
return *p != '\0';
}
-/* List of auditing DSOs. */
+/* LD_AUDIT variable contents. Must be processed before the
+ audit_list below. */
+const char *audit_list_string;
+
+/* Cyclic list of auditing DSOs. audit_list->next is the first
+ element. */
static struct audit_list
{
const char *name;
struct audit_list *next;
} *audit_list;
+/* Iterator for audit_list_string followed by audit_list. */
+struct audit_list_iter
+{
+ /* Tail of audit_list_string still needing processing, or NULL. */
+ const char *audit_list_tail;
+
+ /* The list element returned in the previous iteration. NULL before
+ the first element. */
+ struct audit_list *previous;
+
+ /* Scratch buffer for returning a name which is part of
+ audit_list_string. */
+#ifdef PATH_MAX
+ char fname[PATH_MAX];
+#else
+ char fname[4096];
+#endif
+};
+
+/* Initialize an audit list iterator. */
+static void
+audit_list_iter_init (struct audit_list_iter *iter)
+{
+ iter->audit_list_tail = audit_list_string;
+ iter->previous = NULL;
+}
+
+/* Iterate through both audit_list_string and audit_list. */
+static const char *
+audit_list_iter_next (struct audit_list_iter *iter)
+{
+ if (iter->audit_list_tail != NULL)
+ {
+ /* First iterate over audit_list_string. */
+ while (*iter->audit_list_tail != '\0')
+ {
+ /* Split audit list at colon. */
+ size_t len = strcspn (iter->audit_list_tail, ":");
+ if (len > 0 && len < sizeof(iter->fname))
+ {
+ memcpy (iter->fname, iter->audit_list_tail, len);
+ iter->fname[len] = '\0';
+ }
+ else
+ /* Do not return this name to the caller. */
+ iter->fname[0] = '\0';
+
+ /* Skip over the substring and the following delimiter. */
+ iter->audit_list_tail += len;
+ if (*iter->audit_list_tail == ':')
+ ++iter->audit_list_tail;
+
+ /* If the name is valid, return it. */
+ if (dso_name_valid_for_suid (iter->fname))
+ return iter->fname;
+ /* Otherwise, wrap around and try the next name. */
+ }
+ /* Fall through to the procesing of audit_list. */
+ }
+
+ if (iter->previous == NULL)
+ {
+ if (audit_list == NULL)
+ /* No pre-parsed audit list. */
+ return NULL;
+ /* Start of audit list. The first list element is at
+ audit_list->next (cyclic list). */
+ iter->previous = audit_list->next;
+ return iter->previous->name;
+ }
+ if (iter->previous == audit_list)
+ /* Cyclic list wrap-around. */
+ return NULL;
+ iter->previous = iter->previous->next;
+ return iter->previous->name;
+}
+
#ifndef HAVE_INLINED_SYSCALLS
/* Set nonzero during loading and initialization of executable and
libraries, cleared before the executable's entry point runs. This
@@ -1290,11 +1368,13 @@ of this helper program; chances are you did not intend to run this program.\n\
GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid ();
/* If we have auditing DSOs to load, do it now. */
- if (__glibc_unlikely (audit_list != NULL))
+ bool need_security_init = true;
+ if (__glibc_unlikely (audit_list != NULL)
+ || __glibc_unlikely (audit_list_string != NULL))
{
- /* Iterate over all entries in the list. The order is important. */
struct audit_ifaces *last_audit = NULL;
- struct audit_list *al = audit_list->next;
+ struct audit_list_iter al_iter;
+ audit_list_iter_init (&al_iter);
/* Since we start using the auditing DSOs right away we need to
initialize the data structures now. */
@@ -1305,9 +1385,14 @@ of this helper program; chances are you did not intend to run this program.\n\
use different values (especially the pointer guard) and will
fail later on. */
security_init ();
+ need_security_init = false;
- do
+ while (true)
{
+ const char *name = audit_list_iter_next (&al_iter);
+ if (name == NULL)
+ break;
+
int tls_idx = GL(dl_tls_max_dtv_idx);
/* Now it is time to determine the layout of the static TLS
@@ -1316,7 +1401,7 @@ of this helper program; chances are you did not intend to run this program.\n\
no DF_STATIC_TLS bit is set. The reason is that we know
glibc will use the static model. */
struct dlmopen_args dlmargs;
- dlmargs.fname = al->name;
+ dlmargs.fname = name;
dlmargs.map = NULL;
const char *objname;
@@ -1329,7 +1414,7 @@ of this helper program; chances are you did not intend to run this program.\n\
not_loaded:
_dl_error_printf ("\
ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
- al->name, err_str);
+ name, err_str);
if (malloced)
free ((char *) err_str);
}
@@ -1433,10 +1518,7 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
goto not_loaded;
}
}
-
- al = al->next;
}
- while (al != audit_list->next);
/* If we have any auditing modules, announce that we already
have two objects loaded. */
@@ -1700,7 +1782,7 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
if (tcbp == NULL)
tcbp = init_tls ();
- if (__glibc_likely (audit_list == NULL))
+ if (__glibc_likely (need_security_init))
/* Initialize security features. But only if we have not done it
earlier. */
security_init ();
@@ -2331,9 +2413,7 @@ process_dl_audit (char *str)
char *p;
while ((p = (strsep) (&str, ":")) != NULL)
- if (p[0] != '\0'
- && (__builtin_expect (! __libc_enable_secure, 1)
- || strchr (p, '/') == NULL))
+ if (dso_name_valid_for_suid (p))
{
/* This is using the local malloc, not the system malloc. The
memory can never be freed. */
@@ -2397,7 +2477,7 @@ process_envvars (enum mode *modep)
break;
}
if (memcmp (envline, "AUDIT", 5) == 0)
- process_dl_audit (&envline[6]);
+ audit_list_string = &envline[6];
break;
case 7:
--
2.9.4

33
pkgs/development/libraries/glibc/CVE-2017-1000366-rtld-LD_LIBRARY_PATH.patch
View file

@ -1,33 +0,0 @@
From 4d009d39ac9ede0369e268554a181b428f177a80 Mon Sep 17 00:00:00 2001
Message-Id: <4d009d39ac9ede0369e268554a181b428f177a80.1495998948.git.fweimer@redhat.com>
In-Reply-To: <cover.1495998948.git.fweimer@redhat.com>
References: <cover.1495998948.git.fweimer@redhat.com>
From: Florian Weimer <fweimer@redhat.com>
Date: Sun, 28 May 2017 20:37:40 +0200
Subject: [PATCH 1/3] rtld: Completely ignore LD_LIBRARY_PATH for AT_SECURE=1
programs
To: libc-alpha@sourceware.org
LD_LIBRARY_PATH can only be used to reorder system search paths, which
is not useful functionality.
---
elf/rtld.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/elf/rtld.c b/elf/rtld.c
index 319ef06..824b6cf 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -2419,7 +2419,8 @@ process_envvars (enum mode *modep)
case 12:
/* The library search path. */
- if (memcmp (envline, "LIBRARY_PATH", 12) == 0)
+ if (!__libc_enable_secure
+ && memcmp (envline, "LIBRARY_PATH", 12) == 0)
{
library_path = &envline[13];
break;
--
2.9.4

115
pkgs/development/libraries/glibc/CVE-2017-1000366-rtld-LD_PRELOAD.patch
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@ -1,115 +0,0 @@
From 65ff0b7a085b85271ec8fde99f542281b495e3bc Mon Sep 17 00:00:00 2001
Message-Id: <65ff0b7a085b85271ec8fde99f542281b495e3bc.1495998948.git.fweimer@redhat.com>
In-Reply-To: <cover.1495998948.git.fweimer@redhat.com>
References: <cover.1495998948.git.fweimer@redhat.com>
From: Florian Weimer <fweimer@redhat.com>
Date: Sun, 28 May 2017 20:57:40 +0200
Subject: [PATCH 2/3] rtld: Reject overly long LD_PRELOAD path elements
To: libc-alpha@sourceware.org
---
elf/rtld.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++---------------
1 file changed, 53 insertions(+), 16 deletions(-)
diff --git a/elf/rtld.c b/elf/rtld.c
index 824b6cf..30f0cae 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -99,6 +99,22 @@ uintptr_t __pointer_chk_guard_local
strong_alias (__pointer_chk_guard_local, __pointer_chk_guard)
#endif
+/* Check that AT_SECURE=0, or that the passed name does not contain
+ directories and is not overly long. Reject empty names
+ unconditionally. */
+static bool
+dso_name_valid_for_suid (const char *p)
+{
+ if (__glibc_unlikely (__libc_enable_secure))
+ {
+ /* Ignore pathnames with directories for AT_SECURE=1
+ programs, and also skip overlong names. */
+ size_t len = strlen (p);
+ if (len >= NAME_MAX || memchr (p, '/', len) != NULL)
+ return false;
+ }
+ return *p != '\0';
+}
/* List of auditing DSOs. */
static struct audit_list
@@ -716,6 +732,46 @@ static const char *preloadlist attribute_relro;
/* Nonzero if information about versions has to be printed. */
static int version_info attribute_relro;
+/* The LD_PRELOAD environment variable gives list of libraries
+ separated by white space or colons that are loaded before the
+ executable's dependencies and prepended to the global scope list.
+ (If the binary is running setuid all elements containing a '/' are
+ ignored since it is insecure.) Return the number of preloads
+ performed. */
+unsigned int
+handle_ld_preload (const char *preloadlist, struct link_map *main_map)
+{
+ unsigned int npreloads = 0;
+ const char *p = preloadlist;
+#ifdef PATH_MAX
+ char fname[PATH_MAX];
+#else
+ char fname[4096];
+#endif
+
+ while (*p != '\0')
+ {
+ /* Split preload list at space/colon. */
+ size_t len = strcspn (p, " :");
+ if (len > 0 && len < sizeof(fname))
+ {
+ memcpy (fname, p, len);
+ fname[len] = '\0';
+ }
+ else
+ fname[0] = '\0';
+
+ /* Skip over the substring and the following delimiter. */
+ p += len;
+ if (*p == ' ' || *p == ':')
+ ++p;
+
+ if (dso_name_valid_for_suid (fname))
+ npreloads += do_preload (fname, main_map, "LD_PRELOAD");
+ }
+ return npreloads;
+}
+
static void
dl_main (const ElfW(Phdr) *phdr,
ElfW(Word) phnum,
@@ -1462,23 +1514,8 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
if (__glibc_unlikely (preloadlist != NULL))
{
- /* The LD_PRELOAD environment variable gives list of libraries
- separated by white space or colons that are loaded before the
- executable's dependencies and prepended to the global scope
- list. If the binary is running setuid all elements
- containing a '/' are ignored since it is insecure. */
- char *list = strdupa (preloadlist);
- char *p;
-
HP_TIMING_NOW (start);
-
- /* Prevent optimizing strsep. Speed is not important here. */
- while ((p = (strsep) (&list, " :")) != NULL)
- if (p[0] != '\0'
- && (__builtin_expect (! __libc_enable_secure, 1)
- || strchr (p, '/') == NULL))
- npreloads += do_preload (p, main_map, "LD_PRELOAD");
-
+ npreloads += handle_ld_preload (preloadlist, main_map);
HP_TIMING_NOW (stop);
HP_TIMING_DIFF (diff, start, stop);
HP_TIMING_ACCUM_NT (load_time, diff);
--
2.9.4

22
pkgs/development/libraries/glibc/common.nix
View file

@ -19,6 +19,7 @@
let
inherit (buildPackages) linuxHeaders;
version = "2.25";
patchSuffix = "-49";
sha256 = "067bd9bb3390e79aa45911537d13c3721f1d9d3769931a30c2681bfee66f23a0";
cross = if buildPlatform != hostPlatform then hostPlatform else null;
in
@ -38,7 +39,15 @@ stdenv.mkDerivation ({
enableParallelBuilding = true;
patches =
[ /* Have rpcgen(1) look for cpp(1) in $PATH. */
[
/* No tarballs for stable upstream branch, only https://sourceware.org/git/?p=glibc.git
$ git co release/2.25/master; git describe
glibc-2.25-49-gbc5ace67fe
$ git show --reverse glibc-2.25..release/2.25/master | gzip -n -9 --rsyncable - > 2.25-49.patch.gz
*/
./2.25-49.patch.gz
/* Have rpcgen(1) look for cpp(1) in $PATH. */
./rpcgen-path.patch
/* Allow NixOS and Nix to handle the locale-archive. */
@ -59,15 +68,6 @@ stdenv.mkDerivation ({
"/bin:/usr/bin", which is inappropriate on NixOS machines. This
patch extends the search path by "/run/current-system/sw/bin". */
./fix_path_attribute_in_getconf.patch
/* Stack Clash */
./CVE-2017-1000366-rtld-LD_LIBRARY_PATH.patch
./CVE-2017-1000366-rtld-LD_PRELOAD.patch
./CVE-2017-1000366-rtld-LD_AUDIT.patch
]
++ lib.optionals stdenv.isi686 [
./fix-i686-memchr.patch
./i686-fix-vectorized-strcspn.patch
]
++ lib.optional stdenv.isx86_64 ./fix-x64-abi.patch;
@ -145,7 +145,7 @@ stdenv.mkDerivation ({
// (removeAttrs args [ "withLinuxHeaders" "withGd" ]) //
{
name = name + "-${version}" +
name = name + "-${version}${patchSuffix}" +
lib.optionalString (cross != null) "-${cross.config}";
src = fetchurl {

23
pkgs/development/libraries/glibc/fix-i686-memchr.patch
View file

@ -1,23 +0,0 @@
Fix i686 memchr overflow calculation (BZ#21182)
https://sourceware.org/git/?p=glibc.git;a=commit;h=3abeeec5f46ff03
diff --git a/sysdeps/i386/i686/multiarch/memchr-sse2.S b/sysdeps/i386/i686/multiarch/memchr-sse2.S
index 910679c..e41f324 100644
--- a/sysdeps/i386/i686/multiarch/memchr-sse2.S
+++ b/sysdeps/i386/i686/multiarch/memchr-sse2.S
@@ -117,7 +117,6 @@ L(crosscache):
# ifndef USE_AS_RAWMEMCHR
jnz L(match_case2_prolog1)
- lea -16(%edx), %edx
/* Calculate the last acceptable address and check for possible
addition overflow by using satured math:
edx = ecx + edx
@@ -125,6 +124,7 @@ L(crosscache):
add %ecx, %edx
sbb %eax, %eax
or %eax, %edx
+ sub $16, %edx
jbe L(return_null)
lea 16(%edi), %edi
# else

42
pkgs/development/libraries/glibc/i686-fix-vectorized-strcspn.patch
View file

@ -1,42 +0,0 @@
From adc7e06fb412a2a1ee52f8cb788caf436335b9f3 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Wed, 14 Jun 2017 08:11:22 +0200
Subject: [PATCH] i686: Add missing IS_IN (libc) guards to vectorized strcspn
Since commit d957c4d3fa48d685ff2726c605c988127ef99395 (i386: Compile
rtld-*.os with -mno-sse -mno-mmx -mfpmath=387), vector intrinsics can
no longer be used in ld.so, even if the compiled code never makes it
into the final ld.so link. This commit adds the missing IS_IN (libc)
guard to the SSE 4.2 strcspn implementation, so that it can be used from
ld.so in the future.
(cherry picked from commit 69052a3a95da37169a08f9e59b2cc1808312753c)
---
ChangeLog | 5 +++++
sysdeps/i386/i686/multiarch/strcspn-c.c | 6 ++++--
sysdeps/i386/i686/multiarch/varshift.c | 4 +++-
3 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/sysdeps/i386/i686/multiarch/strcspn-c.c b/sysdeps/i386/i686/multiarch/strcspn-c.c
index 6d61e19..ec230fb 100644
--- a/sysdeps/i386/i686/multiarch/strcspn-c.c
+++ b/sysdeps/i386/i686/multiarch/strcspn-c.c
@@ -1,2 +1,4 @@
-#define __strcspn_sse2 __strcspn_ia32
-#include <sysdeps/x86_64/multiarch/strcspn-c.c>
+#if IS_IN (libc)
+# define __strcspn_sse2 __strcspn_ia32
+# include <sysdeps/x86_64/multiarch/strcspn-c.c>
+#endif
diff --git a/sysdeps/i386/i686/multiarch/varshift.c b/sysdeps/i386/i686/multiarch/varshift.c
index 7760b96..6742a35 100644
--- a/sysdeps/i386/i686/multiarch/varshift.c
+++ b/sysdeps/i386/i686/multiarch/varshift.c
@@ -1 +1,3 @@
-#include <sysdeps/x86_64/multiarch/varshift.c>
+#if IS_IN (libc)
+# include <sysdeps/x86_64/multiarch/varshift.c>
+#endif
--
2.9.3