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小龙 2024-06-13 01:59:28 +00:00 • committed by Gitee
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29a8b5d3298e42d7fc3dd74407812f26 glibc-2.17-c758a686-releng.tar.gz
d91ac2e9667310fa815c2316d542567e glibc-2.17-c758a686.tar.gz

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Author: Charles Fol <folcharles@gmail.com>
Date: Thu Mar 28 12:25:38 2024 -0300
iconv: ISO-2022-CN-EXT: fix out-of-bound writes when writing escape sequence (CVE-2024-2961)
ISO-2022-CN-EXT uses escape sequences to indicate character set changes
(as specified by RFC 1922). While the SOdesignation has the expected
bounds checks, neither SS2designation nor SS3designation have its;
allowing a write overflow of 1, 2, or 3 bytes with fixed values:
'$+I', '$+J', '$+K', '$+L', '$+M', or '$*H'.
Checked on aarch64-linux-gnu.
Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
Conflicts:
iconvdata/Makefile
(usual tests conflict)
diff --git a/iconvdata/Makefile b/iconvdata/Makefile
index 6f440e3f6122f56a..f8886d0f76cdac30 100644
--- a/iconvdata/Makefile
+++ b/iconvdata/Makefile
@@ -72,7 +72,8 @@ endif
ifeq (yes,$(build-shared))
tests = bug-iconv1 bug-iconv2 tst-loading tst-e2big tst-iconv4 bug-iconv4 \
tst-iconv6 bug-iconv5 bug-iconv6 tst-iconv7 bug-iconv8 bug-iconv9 \
- bug-iconv10 bug-iconv11 bug-iconv12 bug-iconv13
+ bug-iconv10 bug-iconv11 bug-iconv12 bug-iconv13 \
+ tst-iconv-iso-2022-cn-ext
ifeq ($(have-thread-library),yes)
tests += bug-iconv3
endif
@@ -306,6 +307,8 @@ $(objpfx)tst-iconv4.out: $(objpfx)gconv-modules \
$(addprefix $(objpfx),$(modules.so))
$(objpfx)tst-iconv7.out: $(objpfx)gconv-modules \
$(addprefix $(objpfx),$(modules.so))
+$(objpfx)tst-iconv-iso-2022-cn-ext.out: $(addprefix $(objpfx), $(gconv-modules)) \
+ $(addprefix $(objpfx),$(modules.so))
$(objpfx)iconv-test.out: run-iconv-test.sh $(objpfx)gconv-modules \
$(addprefix $(objpfx),$(modules.so)) \
diff --git a/iconvdata/iso-2022-cn-ext.c b/iconvdata/iso-2022-cn-ext.c
index c86d8616d417f21b..661a55f1785c2bea 100644
--- a/iconvdata/iso-2022-cn-ext.c
+++ b/iconvdata/iso-2022-cn-ext.c
@@ -564,6 +564,12 @@ enum
{ \
const char *escseq; \
\
+ if (outptr + 4 > outend) \
+ { \
+ result = __GCONV_FULL_OUTPUT; \
+ break; \
+ } \
+ \
assert (used == CNS11643_2_set); /* XXX */ \
escseq = "*H"; \
*outptr++ = ESC; \
@@ -577,6 +583,12 @@ enum
{ \
const char *escseq; \
\
+ if (outptr + 4 > outend) \
+ { \
+ result = __GCONV_FULL_OUTPUT; \
+ break; \
+ } \
+ \
assert ((used >> 5) >= 3 && (used >> 5) <= 7); \
escseq = "+I+J+K+L+M" + ((used >> 5) - 3) * 2; \
*outptr++ = ESC; \
diff --git a/iconvdata/tst-iconv-iso-2022-cn-ext.c b/iconvdata/tst-iconv-iso-2022-cn-ext.c
new file mode 100644
index 0000000000000000..96a8765fd5369681
--- /dev/null
+++ b/iconvdata/tst-iconv-iso-2022-cn-ext.c
@@ -0,0 +1,128 @@
+/* Verify ISO-2022-CN-EXT does not write out of the bounds.
+ Copyright (C) 2024 Free Software Foundation, Inc.
+ 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 <stdio.h>
+#include <string.h>
+
+#include <errno.h>
+#include <iconv.h>
+#include <sys/mman.h>
+
+#include <support/xunistd.h>
+#include <support/check.h>
+#include <support/support.h>
+
+/* The test sets up a two memory page buffer with the second page marked
+ PROT_NONE to trigger a fault if the conversion writes beyond the exact
+ expected amount. Then we carry out various conversions and precisely
+ place the start of the output buffer in order to trigger a SIGSEGV if the
+ process writes anywhere between 1 and page sized bytes more (only one
+ PROT_NONE page is setup as a canary) than expected. These tests exercise
+ all three of the cases in ISO-2022-CN-EXT where the converter must switch
+ character sets and may run out of buffer space while doing the
+ operation. */
+
+static int
+do_test (void)
+{
+ iconv_t cd = iconv_open ("ISO-2022-CN-EXT", "UTF-8");
+ TEST_VERIFY_EXIT (cd != (iconv_t) -1);
+
+ char *ntf;
+ size_t ntfsize;
+ char *outbufbase;
+ {
+ int pgz = getpagesize ();
+ TEST_VERIFY_EXIT (pgz > 0);
+ ntfsize = 2 * pgz;
+
+ ntf = xmmap (NULL, ntfsize, PROT_READ | PROT_WRITE, MAP_PRIVATE
+ | MAP_ANONYMOUS, -1);
+ xmprotect (ntf + pgz, pgz, PROT_NONE);
+
+ outbufbase = ntf + pgz;
+ }
+
+ /* Check if SOdesignation escape sequence does not trigger an OOB write. */
+ {
+ char inbuf[] = "\xe4\xba\xa4\xe6\x8d\xa2";
+
+ for (int i = 0; i < 9; i++)
+ {
+ char *inp = inbuf;
+ size_t inleft = sizeof (inbuf) - 1;
+
+ char *outp = outbufbase - i;
+ size_t outleft = i;
+
+ TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft)
+ == (size_t) -1);
+ TEST_COMPARE (errno, E2BIG);
+
+ TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0);
+ }
+ }
+
+ /* Same as before for SS2designation. */
+ {
+ char inbuf[] = "㴽 \xe3\xb4\xbd";
+
+ for (int i = 0; i < 14; i++)
+ {
+ char *inp = inbuf;
+ size_t inleft = sizeof (inbuf) - 1;
+
+ char *outp = outbufbase - i;
+ size_t outleft = i;
+
+ TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft)
+ == (size_t) -1);
+ TEST_COMPARE (errno, E2BIG);
+
+ TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0);
+ }
+ }
+
+ /* Same as before for SS3designation. */
+ {
+ char inbuf[] = "劄 \xe5\x8a\x84";
+
+ for (int i = 0; i < 14; i++)
+ {
+ char *inp = inbuf;
+ size_t inleft = sizeof (inbuf) - 1;
+
+ char *outp = outbufbase - i;
+ size_t outleft = i;
+
+ TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft)
+ == (size_t) -1);
+ TEST_COMPARE (errno, E2BIG);
+
+ TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0);
+ }
+ }
+
+ TEST_VERIFY_EXIT (iconv_close (cd) != -1);
+
+ xmunmap (ntf, ntfsize);
+
+ return 0;
+}
+
+#include <support/test-driver.c>

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commit 83e43bf0b756065dc640680d90fa6f0b39425182
Author: Allan McRae <allan@archlinux.org>
Date: Mon Sep 9 20:23:35 2013 +1000
Fix nesting of ifdefs in netgroupcache.c
Fixes unclosed '{' if HAVE_SENDFILE is defined (BZ #15895).
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index 5262d5e53ae7ce74..4fce79283a9badb3 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -619,10 +619,10 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
# endif
}
else
+#endif
{
-# ifndef __ASSUME_SENDFILE
+#if defined HAVE_SENDFILE && !defined __ASSUME_SENDFILE
use_write:
-# endif
#endif
writeall (fd, &dataset->resp, sizeof (innetgroup_response_header));
}

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glibc-RHEL-34263-10.patch Normal file
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commit 4bbca1a44691a6e9adcee5c6798a707b626bc331
Author: Florian Weimer <fweimer@redhat.com>
Date: Thu May 2 17:06:19 2024 +0200
nscd: Use time_t for return type of addgetnetgrentX
Using int may give false results for future dates (timeouts after the
year 2028).
Fixes commit 04a21e050d64a1193a6daab872bca2528bda44b ("CVE-2024-33601,
CVE-2024-33602: nscd: netgroup: Use two buffers in addgetnetgrentX
(bug 31680)").
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index 7f78d21065ec832c..e5fa919c419c52d2 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -681,8 +681,8 @@ readdinnetgr (struct database_dyn *db, struct hashentry *he,
.key_len = he->len
};
- int timeout = addinnetgrX (db, -1, &req, db->data + he->key, he->owner,
- he, dh);
+ time_t timeout = addinnetgrX (db, -1, &req, db->data + he->key, he->owner,
+ he, dh);
if (timeout < 0)
timeout = 0;
return timeout;

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Partial backport of the sendfile removal. This backport only
updates nscd/netgroupcache.c, to avoid future conflicts.
commit 8c78faa9ef5c6cae455739f162e4b9d690e32eca
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed May 16 10:51:15 2018 -0300
Fix concurrent changes on nscd aware files (BZ #23178)
As indicated by BZ#23178, concurrent access on some files read by nscd
may result non expected data send through service requisition. This is
due 'sendfile' Linux implementation where for sockets with zero-copy
support, callers must ensure the transferred portions of the the file
reffered by input file descriptor remain unmodified until the reader
on the other end of socket has consumed the transferred data.
I could not find any explicit documentation stating this behaviour on
Linux kernel documentation. However man-pages sendfile entry [1] states
in NOTES the aforementioned remark. It was initially pushed on man-pages
with an explicit testcase [2] that shows changing the file used in
'sendfile' call prior the socket input data consumption results in
previous data being lost.
From commit message it stated on tested Linux version (3.15) only TCP
socket showed this issues, however on recent kernels (4.4) I noticed the
same behaviour for local sockets as well.
Since sendfile on HURD is a read/write operation and the underlying
issue on Linux, the straightforward fix is just remove sendfile use
altogether. I am really skeptical it is hitting some hotstop (there
are indication over internet that sendfile is helpfull only for large
files, more than 10kb) here to justify that extra code complexity or
to pursuit other possible fix (through memory or file locks for
instance, which I am not sure it is doable).
Checked on x86_64-linux-gnu.
[BZ #23178]
* nscd/nscd-client.h (sendfileall): Remove prototype.
* nscd/connections.c [HAVE_SENDFILE] (sendfileall): Remove function.
(handle_request): Use writeall instead of sendfileall.
* nscd/aicache.c (addhstaiX): Likewise.
* nscd/grpcache.c (cache_addgr): Likewise.
* nscd/hstcache.c (cache_addhst): Likewise.
* nscd/initgrcache.c (addinitgroupsX): Likewise.
* nscd/netgroupcache.c (addgetnetgrentX, addinnetgrX): Likewise.
* nscd/pwdcache.c (cache_addpw): Likewise.
* nscd/servicescache.c (cache_addserv): Likewise.
* sysdeps/unix/sysv/linux/Makefile [$(subdir) == nscd]
(sysdep-CFLAGS): Remove -DHAVE_SENDFILE.
* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_SENDFILE):
Remove define.
[1] http://man7.org/linux/man-pages/man2/sendfile.2.html
[2] https://github.com/mkerrisk/man-pages/commit/7b6a3299776b5c1c4f169a591434a855d50c68b4#diff-efd6af3a70f0f07c578e85b51e83b3c3
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index 4fce79283a9badb3..7ee0c284ed58d1e3 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -415,33 +415,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
since while inserting this thread might block and so would
unnecessarily let the receiver wait. */
writeout:
-#ifdef HAVE_SENDFILE
- if (__builtin_expect (db->mmap_used, 1) && cacheable)
- {
- assert (db->wr_fd != -1);
- assert ((char *) &dataset->resp > (char *) db->data);
- assert ((char *) dataset - (char *) db->head + total
- <= (sizeof (struct database_pers_head)
- + db->head->module * sizeof (ref_t)
- + db->head->data_size));
-# ifndef __ASSUME_SENDFILE
- ssize_t written =
-# endif
- sendfileall (fd, db->wr_fd, (char *) &dataset->resp
- - (char *) db->head, dataset->head.recsize);
-# ifndef __ASSUME_SENDFILE
- if (written == -1 && errno == ENOSYS)
- goto use_write;
-# endif
- }
- else
-#endif
- {
-#if defined HAVE_SENDFILE && !defined __ASSUME_SENDFILE
- use_write:
-#endif
- writeall (fd, &dataset->resp, dataset->head.recsize);
- }
+ writeall (fd, &dataset->resp, dataset->head.recsize);
}
if (cacheable)
@@ -596,36 +570,9 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
/* We write the dataset before inserting it to the database
since while inserting this thread might block and so would
unnecessarily let the receiver wait. */
- assert (fd != -1);
+ assert (fd != -1);
-#ifdef HAVE_SENDFILE
- if (__builtin_expect (db->mmap_used, 1) && cacheable)
- {
- assert (db->wr_fd != -1);
- assert ((char *) &dataset->resp > (char *) db->data);
- assert ((char *) dataset - (char *) db->head + sizeof (*dataset)
- <= (sizeof (struct database_pers_head)
- + db->head->module * sizeof (ref_t)
- + db->head->data_size));
-# ifndef __ASSUME_SENDFILE
- ssize_t written =
-# endif
- sendfileall (fd, db->wr_fd,
- (char *) &dataset->resp - (char *) db->head,
- sizeof (innetgroup_response_header));
-# ifndef __ASSUME_SENDFILE
- if (written == -1 && errno == ENOSYS)
- goto use_write;
-# endif
- }
- else
-#endif
- {
-#if defined HAVE_SENDFILE && !defined __ASSUME_SENDFILE
- use_write:
-#endif
- writeall (fd, &dataset->resp, sizeof (innetgroup_response_header));
- }
+ writeall (fd, &dataset->resp, sizeof (innetgroup_response_header));
}
if (cacheable)

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Partial backport of the following commit, restricted to the
netgroup changes:
commit c6dfed243e0310bc3294c0fdf1816fceab024e9b
Author: Roland McGrath <roland@hack.frob.com>
Date: Wed Oct 22 13:17:20 2014 -0700
Rework some nscd code not to use variable-length struct types.
diff --git a/inet/netgroup.h b/inet/netgroup.h
index f3797a698d126157..fa1732762e32c2c0 100644
--- a/inet/netgroup.h
+++ b/inet/netgroup.h
@@ -26,7 +26,7 @@
struct name_list
{
struct name_list *next;
- char name[0];
+ char name[];
};
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index 7ee0c284ed58d1e3..7d7269a8edf1b99d 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -21,6 +21,7 @@
#include <errno.h>
#include <libintl.h>
#include <stdbool.h>
+#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
@@ -136,11 +137,8 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
char *buffer = NULL;
size_t nentries = 0;
size_t group_len = strlen (key) + 1;
- union
- {
- struct name_list elem;
- char mem[sizeof (struct name_list) + group_len];
- } first_needed;
+ struct name_list *first_needed
+ = alloca (sizeof (struct name_list) + group_len);
if (netgroup_database == NULL
&& __nss_database_lookup ("netgroup", NULL, NULL, &netgroup_database))
@@ -153,9 +151,9 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
memset (&data, '\0', sizeof (data));
buffer = xmalloc (buflen);
- first_needed.elem.next = &first_needed.elem;
- memcpy (first_needed.elem.name, key, group_len);
- data.needed_groups = &first_needed.elem;
+ first_needed->next = first_needed;
+ memcpy (first_needed->name, key, group_len);
+ data.needed_groups = first_needed;
while (data.needed_groups != NULL)
{

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commit 745664bd798ec8fd50438605948eea594179fba1
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue Aug 28 13:19:27 2018 +0200
nscd: Fix use-after-free in addgetnetgrentX [BZ #23520]
addinnetgrX may use the heap-allocated buffer, so free the buffer
in this function.
Conflicts:
nscd/netgroupcache.c
(different backport order)
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index 7d7269a8edf1b99d..d234eb5ac48c73f2 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -113,7 +113,8 @@ do_notfound (struct database_dyn *db, int fd, request_header *req,
static time_t
addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
const char *key, uid_t uid, struct hashentry *he,
- struct datahead *dh, struct dataset **resultp)
+ struct datahead *dh, struct dataset **resultp,
+ void **tofreep)
{
if (__builtin_expect (debug_level > 0, 0))
{
@@ -139,6 +140,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
size_t group_len = strlen (key) + 1;
struct name_list *first_needed
= alloca (sizeof (struct name_list) + group_len);
+ *tofreep = NULL;
if (netgroup_database == NULL
&& __nss_database_lookup ("netgroup", NULL, NULL, &netgroup_database))
@@ -151,6 +153,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
memset (&data, '\0', sizeof (data));
buffer = xmalloc (buflen);
+ *tofreep = buffer;
first_needed->next = first_needed;
memcpy (first_needed->name, key, group_len);
data.needed_groups = first_needed;
@@ -439,8 +442,6 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
}
out:
- free (buffer);
-
*resultp = dataset;
return timeout;
@@ -477,8 +478,12 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
group, group_len,
db, uid);
time_t timeout;
+ void *tofree;
if (result != NULL)
- timeout = result->head.timeout;
+ {
+ timeout = result->head.timeout;
+ tofree = NULL;
+ }
else
{
request_header req_get =
@@ -487,7 +492,7 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
.key_len = group_len
};
timeout = addgetnetgrentX (db, -1, &req_get, group, uid, NULL, NULL,
- &result);
+ &result, &tofree);
}
struct indataset
@@ -559,8 +564,8 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
dh->ttl = dataset->head.ttl;
++dh->nreloads;
if (cacheable)
- pthread_rwlock_unlock (&db->lock);
- return timeout;
+ pthread_rwlock_unlock (&db->lock);
+ goto out;
}
if (he == NULL)
@@ -596,17 +601,30 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
dh->usable = false;
}
+ out:
+ free (tofree);
return timeout;
}
+static time_t
+addgetnetgrentX_ignore (struct database_dyn *db, int fd, request_header *req,
+ const char *key, uid_t uid, struct hashentry *he,
+ struct datahead *dh)
+{
+ struct dataset *ignore;
+ void *tofree;
+ time_t timeout = addgetnetgrentX (db, fd, req, key, uid, he, dh,
+ &ignore, &tofree);
+ free (tofree);
+ return timeout;
+}
+
void
addgetnetgrent (struct database_dyn *db, int fd, request_header *req,
void *key, uid_t uid)
{
- struct dataset *ignore;
-
- addgetnetgrentX (db, fd, req, key, uid, NULL, NULL, &ignore);
+ addgetnetgrentX_ignore (db, fd, req, key, uid, NULL, NULL);
}
@@ -619,10 +637,8 @@ readdgetnetgrent (struct database_dyn *db, struct hashentry *he,
.type = GETNETGRENT,
.key_len = he->len
};
- struct dataset *ignore;
-
- return addgetnetgrentX (db, -1, &req, db->data + he->key, he->owner, he, dh,
- &ignore);
+ return addgetnetgrentX_ignore
+ (db, -1, &req, db->data + he->key, he->owner, he, dh);
}

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commit dca565886b5e8bd7966e15f0ca42ee5cff686673
Author: DJ Delorie <dj@redhat.com>
Date: Thu Feb 25 16:08:21 2021 -0500
nscd: Fix double free in netgroupcache [BZ #27462]
In commit 745664bd798ec8fd50438605948eea594179fba1 a use-after-free
was fixed, but this led to an occasional double-free. This patch
tracks the "live" allocation better.
Tested manually by a third party.
Related: RHBZ 1927877
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index d234eb5ac48c73f2..e388ff91fea46e0c 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -248,7 +248,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
: NULL);
ndomain = (ndomain ? newbuf + ndomaindiff
: NULL);
- buffer = newbuf;
+ *tofreep = buffer = newbuf;
}
nhost = memcpy (buffer + bufused,
@@ -319,7 +319,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
else if (status == NSS_STATUS_TRYAGAIN && e == ERANGE)
{
buflen *= 2;
- buffer = xrealloc (buffer, buflen);
+ *tofreep = buffer = xrealloc (buffer, buflen);
}
else if (status == NSS_STATUS_RETURN
|| status == NSS_STATUS_NOTFOUND

31
glibc-RHEL-34263-6.patch Normal file
View file

@ -0,0 +1,31 @@
commit 87801a8fd06db1d654eea3e4f7626ff476a9bdaa
Author: Florian Weimer <fweimer@redhat.com>
Date: Thu Apr 25 15:00:45 2024 +0200
CVE-2024-33599: nscd: Stack-based buffer overflow in netgroup cache (bug 31677)
Using alloca matches what other caches do. The request length is
bounded by MAXKEYLEN.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index e388ff91fea46e0c..0a9d864109cdd8cd 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -503,12 +503,13 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
= (struct indataset *) mempool_alloc (db,
sizeof (*dataset) + req->key_len,
1);
- struct indataset dataset_mem;
bool cacheable = true;
if (__builtin_expect (dataset == NULL, 0))
{
cacheable = false;
- dataset = &dataset_mem;
+ /* The alloca is safe because nscd_run_worker verfies that
+ key_len is not larger than MAXKEYLEN. */
+ dataset = alloca (sizeof (*dataset) + req->key_len);
}
datahead_init_pos (&dataset->head, sizeof (*dataset) + req->key_len,

52
glibc-RHEL-34263-7.patch Normal file
View file

@ -0,0 +1,52 @@
commit 7835b00dbce53c3c87bbbb1754a95fb5e58187aa
Author: Florian Weimer <fweimer@redhat.com>
Date: Thu Apr 25 15:01:07 2024 +0200
CVE-2024-33600: nscd: Do not send missing not-found response in addgetnetgrentX (bug 31678)
If we failed to add a not-found response to the cache, the dataset
point can be null, resulting in a null pointer dereference.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index 0a9d864109cdd8cd..d53c473c3e5139b8 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -148,7 +148,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
/* No such service. */
cacheable = do_notfound (db, fd, req, key, &dataset, &total, &timeout,
&key_copy);
- goto writeout;
+ goto maybe_cache_add;
}
memset (&data, '\0', sizeof (data));
@@ -349,7 +349,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
{
cacheable = do_notfound (db, fd, req, key, &dataset, &total, &timeout,
&key_copy);
- goto writeout;
+ goto maybe_cache_add;
}
total = buffilled;
@@ -411,14 +411,12 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
}
if (he == NULL && fd != -1)
- {
- /* We write the dataset before inserting it to the database
- since while inserting this thread might block and so would
- unnecessarily let the receiver wait. */
- writeout:
+ /* We write the dataset before inserting it to the database since
+ while inserting this thread might block and so would
+ unnecessarily let the receiver wait. */
writeall (fd, &dataset->resp, dataset->head.recsize);
- }
+ maybe_cache_add:
if (cacheable)
{
/* If necessary, we also propagate the data to disk. */

53
glibc-RHEL-34263-8.patch Normal file
View file

@ -0,0 +1,53 @@
commit b048a482f088e53144d26a61c390bed0210f49f2
Author: Florian Weimer <fweimer@redhat.com>
Date: Thu Apr 25 15:01:07 2024 +0200
CVE-2024-33600: nscd: Avoid null pointer crashes after notfound response (bug 31678)
The addgetnetgrentX call in addinnetgrX may have failed to produce
a result, so the result variable in addinnetgrX can be NULL.
Use db->negtimeout as the fallback value if there is no result data;
the timeout is also overwritten below.
Also avoid sending a second not-found response. (The client
disconnects after receiving the first response, so the data stream did
not go out of sync even without this fix.) It is still beneficial to
add the negative response to the mapping, so that the client can get
it from there in the future, instead of going through the socket.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index d53c473c3e5139b8..07f23a75d76e652c 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -512,14 +512,15 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
datahead_init_pos (&dataset->head, sizeof (*dataset) + req->key_len,
sizeof (innetgroup_response_header),
- he == NULL ? 0 : dh->nreloads + 1, result->head.ttl);
+ he == NULL ? 0 : dh->nreloads + 1,
+ result == NULL ? db->negtimeout : result->head.ttl);
/* Set the notfound status and timeout based on the result from
getnetgrent. */
- dataset->head.notfound = result->head.notfound;
+ dataset->head.notfound = result == NULL || result->head.notfound;
dataset->head.timeout = timeout;
dataset->resp.version = NSCD_VERSION;
- dataset->resp.found = result->resp.found;
+ dataset->resp.found = result != NULL && result->resp.found;
/* Until we find a matching entry the result is 0. */
dataset->resp.result = 0;
@@ -567,7 +568,9 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
goto out;
}
- if (he == NULL)
+ /* addgetnetgrentX may have already sent a notfound response. Do
+ not send another one. */
+ if (he == NULL && dataset->resp.found)
{
/* We write the dataset before inserting it to the database
since while inserting this thread might block and so would

383
glibc-RHEL-34263-9.patch Normal file
View file

@ -0,0 +1,383 @@
commit c04a21e050d64a1193a6daab872bca2528bda44b
Author: Florian Weimer <fweimer@redhat.com>
Date: Thu Apr 25 15:01:07 2024 +0200
CVE-2024-33601, CVE-2024-33602: nscd: netgroup: Use two buffers in addgetnetgrentX (bug 31680)
This avoids potential memory corruption when the underlying NSS
callback function does not use the buffer space to store all strings
(e.g., for constant strings).
Instead of custom buffer management, two scratch buffers are used.
This increases stack usage somewhat.
Scratch buffer allocation failure is handled by return -1
(an invalid timeout value) instead of terminating the process.
This fixes bug 31679.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index 07f23a75d76e652c..7f78d21065ec832c 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -24,6 +24,7 @@
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
+#include <scratch_buffer.h>
#include "../inet/netgroup.h"
#include "nscd.h"
@@ -66,6 +67,16 @@ struct dataset
char strdata[0];
};
+/* Send a notfound response to FD. Always returns -1 to indicate an
+ ephemeral error. */
+static time_t
+send_notfound (int fd)
+{
+ if (fd != -1)
+ TEMP_FAILURE_RETRY (send (fd, &notfound, sizeof (notfound), MSG_NOSIGNAL));
+ return -1;
+}
+
/* Sends a notfound message and prepares a notfound dataset to write to the
cache. Returns true if there was enough memory to allocate the dataset and
returns the dataset in DATASETP, total bytes to write in TOTALP and the
@@ -84,8 +95,7 @@ do_notfound (struct database_dyn *db, int fd, request_header *req,
total = sizeof (notfound);
timeout = time (NULL) + db->negtimeout;
- if (fd != -1)
- TEMP_FAILURE_RETRY (send (fd, &notfound, total, MSG_NOSIGNAL));
+ send_notfound (fd);
dataset = mempool_alloc (db, sizeof (struct dataset) + req->key_len, 1);
/* If we cannot permanently store the result, so be it. */
@@ -110,11 +120,78 @@ do_notfound (struct database_dyn *db, int fd, request_header *req,
return cacheable;
}
+struct addgetnetgrentX_scratch
+{
+ /* This is the result that the caller should use. It can be NULL,
+ point into buffer, or it can be in the cache. */
+ struct dataset *dataset;
+
+ struct scratch_buffer buffer;
+
+ /* Used internally in addgetnetgrentX as a staging area. */
+ struct scratch_buffer tmp;
+
+ /* Number of bytes in buffer that are actually used. */
+ size_t buffer_used;
+};
+
+static void
+addgetnetgrentX_scratch_init (struct addgetnetgrentX_scratch *scratch)
+{
+ scratch->dataset = NULL;
+ scratch_buffer_init (&scratch->buffer);
+ scratch_buffer_init (&scratch->tmp);
+
+ /* Reserve space for the header. */
+ scratch->buffer_used = sizeof (struct dataset);
+ static_assert (sizeof (struct dataset) < sizeof (scratch->tmp.__space),
+ "initial buffer space");
+ memset (scratch->tmp.data, 0, sizeof (struct dataset));
+}
+
+static void
+addgetnetgrentX_scratch_free (struct addgetnetgrentX_scratch *scratch)
+{
+ scratch_buffer_free (&scratch->buffer);
+ scratch_buffer_free (&scratch->tmp);
+}
+
+/* Copy LENGTH bytes from S into SCRATCH. Returns NULL if SCRATCH
+ could not be resized, otherwise a pointer to the copy. */
+static char *
+addgetnetgrentX_append_n (struct addgetnetgrentX_scratch *scratch,
+ const char *s, size_t length)
+{
+ while (true)
+ {
+ size_t remaining = scratch->buffer.length - scratch->buffer_used;
+ if (remaining >= length)
+ break;
+ if (!scratch_buffer_grow_preserve (&scratch->buffer))
+ return NULL;
+ }
+ char *copy = scratch->buffer.data + scratch->buffer_used;
+ memcpy (copy, s, length);
+ scratch->buffer_used += length;
+ return copy;
+}
+
+/* Copy S into SCRATCH, including its null terminator. Returns false
+ if SCRATCH could not be resized. */
+static bool
+addgetnetgrentX_append (struct addgetnetgrentX_scratch *scratch, const char *s)
+{
+ if (s == NULL)
+ s = "";
+ return addgetnetgrentX_append_n (scratch, s, strlen (s) + 1) != NULL;
+}
+
+/* Caller must initialize and free *SCRATCH. If the return value is
+ negative, this function has sent a notfound response. */
static time_t
addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
const char *key, uid_t uid, struct hashentry *he,
- struct datahead *dh, struct dataset **resultp,
- void **tofreep)
+ struct datahead *dh, struct addgetnetgrentX_scratch *scratch)
{
if (__builtin_expect (debug_level > 0, 0))
{
@@ -133,14 +210,10 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
char *key_copy = NULL;
struct __netgrent data;
- size_t buflen = MAX (1024, sizeof (*dataset) + req->key_len);
- size_t buffilled = sizeof (*dataset);
- char *buffer = NULL;
size_t nentries = 0;
size_t group_len = strlen (key) + 1;
struct name_list *first_needed
= alloca (sizeof (struct name_list) + group_len);
- *tofreep = NULL;
if (netgroup_database == NULL
&& __nss_database_lookup ("netgroup", NULL, NULL, &netgroup_database))
@@ -152,8 +225,6 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
}
memset (&data, '\0', sizeof (data));
- buffer = xmalloc (buflen);
- *tofreep = buffer;
first_needed->next = first_needed;
memcpy (first_needed->name, key, group_len);
data.needed_groups = first_needed;
@@ -196,8 +267,8 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
while (1)
{
int e;
- status = getfct.f (&data, buffer + buffilled,
- buflen - buffilled - req->key_len, &e);
+ status = getfct.f (&data, scratch->tmp.data,
+ scratch->tmp.length, &e);
if (status == NSS_STATUS_SUCCESS)
{
if (data.type == triple_val)
@@ -205,68 +276,10 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
const char *nhost = data.val.triple.host;
const char *nuser = data.val.triple.user;
const char *ndomain = data.val.triple.domain;
-
- size_t hostlen = strlen (nhost ?: "") + 1;
- size_t userlen = strlen (nuser ?: "") + 1;
- size_t domainlen = strlen (ndomain ?: "") + 1;
-
- if (nhost == NULL || nuser == NULL || ndomain == NULL
- || nhost > nuser || nuser > ndomain)
- {
- const char *last = nhost;
- if (last == NULL
- || (nuser != NULL && nuser > last))
- last = nuser;
- if (last == NULL
- || (ndomain != NULL && ndomain > last))
- last = ndomain;
-
- size_t bufused
- = (last == NULL
- ? buffilled
- : last + strlen (last) + 1 - buffer);
-
- /* We have to make temporary copies. */
- size_t needed = hostlen + userlen + domainlen;
-
- if (buflen - req->key_len - bufused < needed)
- {
- buflen += MAX (buflen, 2 * needed);
- /* Save offset in the old buffer. We don't
- bother with the NULL check here since
- we'll do that later anyway. */
- size_t nhostdiff = nhost - buffer;
- size_t nuserdiff = nuser - buffer;
- size_t ndomaindiff = ndomain - buffer;
-
- char *newbuf = xrealloc (buffer, buflen);
- /* Fix up the triplet pointers into the new
- buffer. */
- nhost = (nhost ? newbuf + nhostdiff
- : NULL);
- nuser = (nuser ? newbuf + nuserdiff
- : NULL);
- ndomain = (ndomain ? newbuf + ndomaindiff
- : NULL);
- *tofreep = buffer = newbuf;
- }
-
- nhost = memcpy (buffer + bufused,
- nhost ?: "", hostlen);
- nuser = memcpy ((char *) nhost + hostlen,
- nuser ?: "", userlen);
- ndomain = memcpy ((char *) nuser + userlen,
- ndomain ?: "", domainlen);
- }
-
- char *wp = buffer + buffilled;
- wp = memmove (wp, nhost ?: "", hostlen);
- wp += hostlen;
- wp = memmove (wp, nuser ?: "", userlen);
- wp += userlen;
- wp = memmove (wp, ndomain ?: "", domainlen);
- wp += domainlen;
- buffilled = wp - buffer;
+ if (!(addgetnetgrentX_append (scratch, nhost)
+ && addgetnetgrentX_append (scratch, nuser)
+ && addgetnetgrentX_append (scratch, ndomain)))
+ return send_notfound (fd);
++nentries;
}
else
@@ -318,8 +331,8 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
}
else if (status == NSS_STATUS_TRYAGAIN && e == ERANGE)
{
- buflen *= 2;
- *tofreep = buffer = xrealloc (buffer, buflen);
+ if (!scratch_buffer_grow (&scratch->tmp))
+ return send_notfound (fd);
}
else if (status == NSS_STATUS_RETURN
|| status == NSS_STATUS_NOTFOUND
@@ -352,10 +365,17 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
goto maybe_cache_add;
}
- total = buffilled;
+ /* Capture the result size without the key appended. */
+ total = scratch->buffer_used;
+
+ /* Make a copy of the key. The scratch buffer must not move after
+ this point. */
+ key_copy = addgetnetgrentX_append_n (scratch, key, req->key_len);
+ if (key_copy == NULL)
+ return send_notfound (fd);
/* Fill in the dataset. */
- dataset = (struct dataset *) buffer;
+ dataset = scratch->buffer.data;
timeout = datahead_init_pos (&dataset->head, total + req->key_len,
total - offsetof (struct dataset, resp),
he == NULL ? 0 : dh->nreloads + 1,
@@ -364,11 +384,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
dataset->resp.version = NSCD_VERSION;
dataset->resp.found = 1;
dataset->resp.nresults = nentries;
- dataset->resp.result_len = buffilled - sizeof (*dataset);
-
- assert (buflen - buffilled >= req->key_len);
- key_copy = memcpy (buffer + buffilled, key, req->key_len);
- buffilled += req->key_len;
+ dataset->resp.result_len = total - sizeof (*dataset);
/* Now we can determine whether on refill we have to create a new
record or not. */
@@ -399,7 +415,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
if (__builtin_expect (newp != NULL, 1))
{
/* Adjust pointer into the memory block. */
- key_copy = (char *) newp + (key_copy - buffer);
+ key_copy = (char *) newp + (key_copy - (char *) dataset);
dataset = memcpy (newp, dataset, total + req->key_len);
cacheable = true;
@@ -440,7 +456,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
}
out:
- *resultp = dataset;
+ scratch->dataset = dataset;
return timeout;
}
@@ -461,6 +477,9 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
if (user != NULL)
key = (char *) rawmemchr (key, '\0') + 1;
const char *domain = *key++ ? key : NULL;
+ struct addgetnetgrentX_scratch scratch;
+
+ addgetnetgrentX_scratch_init (&scratch);
if (__builtin_expect (debug_level > 0, 0))
{
@@ -476,12 +495,8 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
group, group_len,
db, uid);
time_t timeout;
- void *tofree;
if (result != NULL)
- {
- timeout = result->head.timeout;
- tofree = NULL;
- }
+ timeout = result->head.timeout;
else
{
request_header req_get =
@@ -490,7 +505,10 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
.key_len = group_len
};
timeout = addgetnetgrentX (db, -1, &req_get, group, uid, NULL, NULL,
- &result, &tofree);
+ &scratch);
+ result = scratch.dataset;
+ if (timeout < 0)
+ goto out;
}
struct indataset
@@ -604,7 +622,7 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
}
out:
- free (tofree);
+ addgetnetgrentX_scratch_free (&scratch);
return timeout;
}
@@ -614,11 +632,12 @@ addgetnetgrentX_ignore (struct database_dyn *db, int fd, request_header *req,
const char *key, uid_t uid, struct hashentry *he,
struct datahead *dh)
{
- struct dataset *ignore;
- void *tofree;
- time_t timeout = addgetnetgrentX (db, fd, req, key, uid, he, dh,
- &ignore, &tofree);
- free (tofree);
+ struct addgetnetgrentX_scratch scratch;
+ addgetnetgrentX_scratch_init (&scratch);
+ time_t timeout = addgetnetgrentX (db, fd, req, key, uid, he, dh, &scratch);
+ addgetnetgrentX_scratch_free (&scratch);
+ if (timeout < 0)
+ timeout = 0;
return timeout;
}
@@ -662,5 +681,9 @@ readdinnetgr (struct database_dyn *db, struct hashentry *he,
.key_len = he->len
};
- return addinnetgrX (db, -1, &req, db->data + he->key, he->owner, he, dh);
+ int timeout = addinnetgrX (db, -1, &req, db->data + he->key, he->owner,
+ he, dh);
+ if (timeout < 0)
+ timeout = 0;
+ return timeout;
}

39
glibc.spec
View file

@ -125,7 +125,7 @@
Summary: The GNU libc libraries Summary: The GNU libc libraries
Name: glibc Name: glibc
Version: %{glibcversion} Version: %{glibcversion}
Release: %{glibcrelease} Release: %{glibcrelease}.3
# GPLv2+ is used in a bunch of programs, LGPLv2+ is used for libraries. # GPLv2+ is used in a bunch of programs, LGPLv2+ is used for libraries.
# Things that are linked directly into dynamically linked programs # Things that are linked directly into dynamically linked programs
# and shared libraries (e.g. crt files, lib*_nonshared.a) have an additional # and shared libraries (e.g. crt files, lib*_nonshared.a) have an additional
@ -1644,6 +1644,17 @@ Patch2861: glibc-rh1927536.patch
Patch2862: glibc-rh1993930.patch Patch2862: glibc-rh1993930.patch
Patch2863: glibc-rh2065058-1.patch Patch2863: glibc-rh2065058-1.patch
Patch2864: glibc-rh2065058-2.patch Patch2864: glibc-rh2065058-2.patch
Patch20671: glibc-RHEL-31803.patch
Patch20672: glibc-RHEL-34263-1.patch
Patch20673: glibc-RHEL-34263-2.patch
Patch20674: glibc-RHEL-34263-3.patch
Patch20675: glibc-RHEL-34263-4.patch
Patch20676: glibc-RHEL-34263-5.patch
Patch20677: glibc-RHEL-34263-6.patch
Patch20678: glibc-RHEL-34263-7.patch
Patch20679: glibc-RHEL-34263-8.patch
Patch20680: glibc-RHEL-34263-9.patch
Patch20681: glibc-RHEL-34263-10.patch
############################################################################## ##############################################################################
# End of glibc patches. # End of glibc patches.
@ -3018,6 +3029,17 @@ package or when debugging this package.
%patch2862 -p1 %patch2862 -p1
%patch2863 -p1 %patch2863 -p1
%patch2864 -p1 %patch2864 -p1
%patch -P 20671 -p1
%patch -P 20672 -p1
%patch -P 20673 -p1
%patch -P 20674 -p1
%patch -P 20675 -p1
%patch -P 20676 -p1
%patch -P 20677 -p1
%patch -P 20678 -p1
%patch -P 20679 -p1
%patch -P 20680 -p1
%patch -P 20681 -p1
############################################################################## ##############################################################################
# %%prep - Additional prep required... # %%prep - Additional prep required...
@ -4205,6 +4227,21 @@ rm -f *.filelist*
%endif %endif
%changelog %changelog
* Thu May 2 2024 Florian Weimer <fweimer@redhat.com> - 2.17-326.3
- nscd: Fix timeout type in netgroup cache (RHEL-34263)
* Tue Apr 30 2024 Florian Weimer <fweimer@redhat.com> - 2.17-326.2
- nscd: Do not use sendfile for the netgroup cache
- nscd: Use-after-free in netgroup cache
- CVE-2021-27645: nscd: double-free in netgroup cache
- CVE-2024-33599: nscd: buffer overflow in netgroup cache (RHEL-34263)
- CVE-2024-33600: nscd: null pointer dereferences in netgroup cache
- CVE-2024-33601: nscd: crash on out-of-memory condition
- CVE-2024-33602: nscd: memory corruption with NSS netgroup modules
* Tue Apr 16 2024 Florian Weimer <fweimer@redhat.com> - 2.17-326.1
- CVE-2024-2961: Out of bounds write in iconv conversion to ISO-2022-CN-EXT (RHEL-31803)
* Fri Mar 18 2022 DJ Delorie <dj@redhat.com> - 2.17-326 * Fri Mar 18 2022 DJ Delorie <dj@redhat.com> - 2.17-326
- resolv: Handle DNS transaction ID collisions (#2065058) - resolv: Handle DNS transaction ID collisions (#2065058)