1b137f8d15
Upstream commit: 97bb89668d7171164975f3dc895e38343a2f3a95
- Force DT_RPATH for --enable-hardcoded-path-in-tests
- elf: Only process multiple tunable once (BZ 31686)
- Add a test to check for duplicate definitions in the static library
- i686: Fix multiple definitions of __memmove_chk and __memset_chk
- i586: Fix multiple definitions of __memcpy_chk and __mempcpy_chk
- time: Allow later version licensing.
- nscd: Use time_t for return type of addgetnetgrentX
- login: structs utmp, utmpx, lastlog _TIME_BITS independence (bug 30701)
- login: Check default sizes of structs utmp, utmpx, lastlog
Related: RHEL-35602
Fedora 40 commit: b3097fa24a
208 lines
6.5 KiB
Diff
208 lines
6.5 KiB
Diff
commit 71149c2a2e85a8233631cc816030d449f021bb2a
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Mon May 6 13:18:45 2024 -0300
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elf: Only process multiple tunable once (BZ 31686)
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The 680c597e9c3 commit made loader reject ill-formatted strings by
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first tracking all set tunables and then applying them. However, it does
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not take into consideration if the same tunable is set multiple times,
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where parse_tunables_string appends the found tunable without checking
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if it was already in the list. It leads to a stack-based buffer overflow
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if the tunable is specified more than the total number of tunables. For
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instance:
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GLIBC_TUNABLES=glibc.malloc.check=2:... (repeat over the number of
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total support for different tunable).
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Instead, use the index of the tunable list to get the expected tunable
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entry. Since now the initial list is zero-initialized, the compiler
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might emit an extra memset and this requires some minor adjustment
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on some ports.
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Checked on x86_64-linux-gnu and aarch64-linux-gnu.
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Reported-by: Yuto Maeda <maeda@cyberdefense.jp>
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Reported-by: Yutaro Shimizu <shimizu@cyberdefense.jp>
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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(cherry picked from commit bcae44ea8536b30a7119c0986ff5692bddacb672)
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diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c
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index 03e1a68675d65224..614ac9c0471c5963 100644
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--- a/elf/dl-tunables.c
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+++ b/elf/dl-tunables.c
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@@ -32,6 +32,7 @@
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#include <ldsodefs.h>
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#include <array_length.h>
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#include <dl-minimal-malloc.h>
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+#include <dl-symbol-redir-ifunc.h>
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#define TUNABLES_INTERNAL 1
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#include "dl-tunables.h"
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@@ -223,6 +224,7 @@ parse_tunables_string (const char *valstring, struct tunable_toset_t *tunables)
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{
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tunables[ntunables++] =
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(struct tunable_toset_t) { cur, value, p - value };
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+
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break;
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}
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}
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@@ -234,23 +236,27 @@ parse_tunables_string (const char *valstring, struct tunable_toset_t *tunables)
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static void
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parse_tunables (const char *valstring)
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{
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- struct tunable_toset_t tunables[tunables_list_size];
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- int ntunables = parse_tunables_string (valstring, tunables);
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- if (ntunables == -1)
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+ struct tunable_toset_t tunables[tunables_list_size] = { 0 };
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+ if (parse_tunables_string (valstring, tunables) == -1)
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{
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_dl_error_printf (
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"WARNING: ld.so: invalid GLIBC_TUNABLES `%s': ignored.\n", valstring);
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return;
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}
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- for (int i = 0; i < ntunables; i++)
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- if (!tunable_initialize (tunables[i].t, tunables[i].value,
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- tunables[i].len))
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- _dl_error_printf ("WARNING: ld.so: invalid GLIBC_TUNABLES value `%.*s' "
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- "for option `%s': ignored.\n",
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- (int) tunables[i].len,
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- tunables[i].value,
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- tunables[i].t->name);
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+ for (int i = 0; i < tunables_list_size; i++)
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+ {
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+ if (tunables[i].t == NULL)
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+ continue;
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+
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+ if (!tunable_initialize (tunables[i].t, tunables[i].value,
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+ tunables[i].len))
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+ _dl_error_printf ("WARNING: ld.so: invalid GLIBC_TUNABLES value `%.*s' "
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+ "for option `%s': ignored.\n",
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+ (int) tunables[i].len,
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+ tunables[i].value,
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+ tunables[i].t->name);
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+ }
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}
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/* Initialize the tunables list from the environment. For now we only use the
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diff --git a/elf/tst-tunables.c b/elf/tst-tunables.c
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index 095b5c81d95c8760..dff34ed748b4ae83 100644
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--- a/elf/tst-tunables.c
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+++ b/elf/tst-tunables.c
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@@ -17,6 +17,10 @@
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<https://www.gnu.org/licenses/>. */
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#include <array_length.h>
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+/* The test uses the tunable_list size, which is only exported for
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+ ld.so. This will result in a copy of tunable_list, which is ununsed by
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+ the test itself. */
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+#define TUNABLES_INTERNAL 1
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#include <dl-tunables.h>
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#include <getopt.h>
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#include <intprops.h>
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@@ -24,12 +28,13 @@
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#include <stdlib.h>
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#include <support/capture_subprocess.h>
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#include <support/check.h>
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+#include <support/support.h>
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static int restart;
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#define CMDLINE_OPTIONS \
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{ "restart", no_argument, &restart, 1 },
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-static const struct test_t
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+static struct test_t
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{
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const char *name;
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const char *value;
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@@ -284,6 +289,29 @@ static const struct test_t
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0,
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0,
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},
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+ /* Also check for repeated tunables with a count larger than the total number
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+ of tunables. */
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+ {
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+ "GLIBC_TUNABLES",
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+ NULL,
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+ 2,
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+ 0,
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+ 0,
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+ },
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+ {
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+ "GLIBC_TUNABLES",
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+ NULL,
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+ 1,
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+ 0,
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+ 0,
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+ },
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+ {
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+ "GLIBC_TUNABLES",
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+ NULL,
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+ 0,
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+ 0,
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+ 0,
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+ },
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};
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static int
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@@ -327,6 +355,37 @@ do_test (int argc, char *argv[])
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spargv[i] = NULL;
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}
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+ /* Create a tunable line with the duplicate values with a total number
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+ larger than the different number of tunables. */
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+ {
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+ enum { tunables_list_size = array_length (tunable_list) };
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+ const char *value = "";
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+ for (int i = 0; i < tunables_list_size; i++)
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+ value = xasprintf ("%sglibc.malloc.check=2%c",
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+ value,
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+ i == (tunables_list_size - 1) ? '\0' : ':');
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+ tests[33].value = value;
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+ }
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+ /* Same as before, but the last tunable values is differen than the
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+ rest. */
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+ {
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+ enum { tunables_list_size = array_length (tunable_list) };
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+ const char *value = "";
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+ for (int i = 0; i < tunables_list_size - 1; i++)
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+ value = xasprintf ("%sglibc.malloc.check=2:", value);
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+ value = xasprintf ("%sglibc.malloc.check=1", value);
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+ tests[34].value = value;
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+ }
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+ /* Same as before, but with an invalid last entry. */
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+ {
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+ enum { tunables_list_size = array_length (tunable_list) };
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+ const char *value = "";
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+ for (int i = 0; i < tunables_list_size - 1; i++)
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+ value = xasprintf ("%sglibc.malloc.check=2:", value);
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+ value = xasprintf ("%sglibc.malloc.check=1=1", value);
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+ tests[35].value = value;
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+ }
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+
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for (int i = 0; i < array_length (tests); i++)
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{
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snprintf (nteststr, sizeof nteststr, "%d", i);
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diff --git a/sysdeps/aarch64/multiarch/memset_generic.S b/sysdeps/aarch64/multiarch/memset_generic.S
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index 81748bdbce53e636..e125a5ed853301e1 100644
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--- a/sysdeps/aarch64/multiarch/memset_generic.S
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+++ b/sysdeps/aarch64/multiarch/memset_generic.S
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@@ -33,3 +33,7 @@
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#endif
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#include <../memset.S>
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+
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+#if IS_IN (rtld)
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+strong_alias (memset, __memset_generic)
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+#endif
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diff --git a/sysdeps/sparc/sparc64/rtld-memset.c b/sysdeps/sparc/sparc64/rtld-memset.c
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index 55f38357902933b5..a19202a620fb8f7d 100644
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--- a/sysdeps/sparc/sparc64/rtld-memset.c
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+++ b/sysdeps/sparc/sparc64/rtld-memset.c
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@@ -1 +1,4 @@
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#include <string/memset.c>
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+#if IS_IN(rtld)
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+strong_alias (memset, __memset_ultra1)
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+#endif
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