elf: Keep using minimal malloc after early DTV resize (RHEL-71922)
Resolves: RHEL-71922
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Patsy Griffin
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81278fcf43
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aa9ad34e57
179
glibc-RHEL-71922.patch
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179
glibc-RHEL-71922.patch
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@ -0,0 +1,179 @@
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commit aa3d7bd5299b33bffc118aa618b59bfa66059bcb
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Feb 13 21:56:52 2025 +0100
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elf: Keep using minimal malloc after early DTV resize (bug 32412)
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If an auditor loads many TLS-using modules during startup, it is
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possible to trigger DTV resizing. Previously, the DTV was marked
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as allocated by the main malloc afterwards, even if the minimal
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malloc was still in use. With this change, _dl_resize_dtv marks
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the resized DTV as allocated with the minimal malloc.
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The new test reuses TLS-using modules from other auditing tests.
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Reviewed-by: DJ Delorie <dj@redhat.com>
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Conflicts:
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elf/Makefile
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(Usual conflicts due to test backport differences.)
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diff -Nrup a/elf/Makefile b/elf/Makefile
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--- a/elf/Makefile 2025-05-14 14:37:07.334678591 -0400
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+++ b/elf/Makefile 2025-05-14 14:34:58.909954088 -0400
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@@ -362,6 +362,7 @@ tests += \
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tst-align2 \
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tst-audit-tlsdesc \
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tst-audit-tlsdesc-dlopen \
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+ tst-audit-tlsdesc-dlopen2 \
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tst-audit1 \
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tst-audit2 \
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tst-audit8 \
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@@ -743,6 +744,7 @@ modules-names = \
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tst-auditmanymod8 \
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tst-auditmanymod9 \
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tst-auditmod-tlsdesc \
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+ tst-auditmod-tlsdesc2 \
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tst-auditmod1 \
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tst-auditmod9a \
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tst-auditmod9b \
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@@ -2771,6 +2773,9 @@ $(objpfx)tst-audit-tlsdesc.out: $(objpfx
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tst-audit-tlsdesc-ENV = LD_AUDIT=$(objpfx)tst-auditmod-tlsdesc.so
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$(objpfx)tst-audit-tlsdesc-dlopen.out: $(objpfx)tst-auditmod-tlsdesc.so
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tst-audit-tlsdesc-dlopen-ENV = LD_AUDIT=$(objpfx)tst-auditmod-tlsdesc.so
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+$(objpfx)tst-audit-tlsdesc-dlopen2.out: $(objpfx)tst-auditmod-tlsdesc2.so \
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+ $(patsubst %, $(objpfx)%.so, $(tlsmod17a-modules))
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+tst-audit-tlsdesc-dlopen2-ENV = LD_AUDIT=$(objpfx)tst-auditmod-tlsdesc2.so
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$(objpfx)tst-dlmopen-twice.out: \
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$(objpfx)tst-dlmopen-twice-mod1.so \
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diff -Nrup a/elf/dl-tls.c b/elf/dl-tls.c
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--- a/elf/dl-tls.c 2025-05-14 14:37:06.814675657 -0400
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+++ b/elf/dl-tls.c 2025-05-14 14:29:04.110980989 -0400
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@@ -534,6 +534,13 @@ _dl_resize_dtv (dtv_t *dtv, size_t max_m
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if (newp == NULL)
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oom ();
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memcpy (newp, &dtv[-1], (2 + oldsize) * sizeof (dtv_t));
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+#ifdef SHARED
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+ /* Auditors can trigger a DTV resize event while the full malloc
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+ is not yet in use. Mark the new DTV allocation as the
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+ initial allocation. */
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+ if (!__rtld_malloc_is_complete ())
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+ GL(dl_initial_dtv) = &newp[1];
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+#endif
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}
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else
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{
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diff -Nrup a/elf/tst-audit-tlsdesc-dlopen2.c b/elf/tst-audit-tlsdesc-dlopen2.c
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--- a/elf/tst-audit-tlsdesc-dlopen2.c 1969-12-31 19:00:00.000000000 -0500
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+++ b/elf/tst-audit-tlsdesc-dlopen2.c 2025-05-14 14:29:04.110980989 -0400
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@@ -0,0 +1,46 @@
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+/* Loading TLS-using modules from auditors (bug 32412). Main program.
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+ Copyright (C) 2021-2025 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <support/xdlfcn.h>
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+#include <stdio.h>
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+
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+static int
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+do_test (void)
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+{
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+ puts ("info: start of main program");
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+
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+ /* Load TLS-using modules, to trigger DTV resizing. The dynamic
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+ linker will load them again (requiring their own TLS) because the
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+ dlopen calls from the auditor were in the auditing namespace. */
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+ for (int i = 1; i <= 19; ++i)
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+ {
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+ char dso[30];
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+ snprintf (dso, sizeof (dso), "tst-tlsmod17a%d.so", i);
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+ char sym[30];
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+ snprintf (sym, sizeof(sym), "tlsmod17a%d", i);
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+
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+ void *handle = xdlopen (dso, RTLD_LAZY);
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+ int (*func) (void) = xdlsym (handle, sym);
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+ /* Trigger TLS allocation. */
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+ func ();
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+ }
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+
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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diff -Nrup a/elf/tst-auditmod-tlsdesc2.c b/elf/tst-auditmod-tlsdesc2.c
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--- a/elf/tst-auditmod-tlsdesc2.c 1969-12-31 19:00:00.000000000 -0500
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+++ b/elf/tst-auditmod-tlsdesc2.c 2025-05-14 14:29:04.110980989 -0400
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@@ -0,0 +1,59 @@
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+/* Loading TLS-using modules from auditors (bug 32412). Audit module.
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+ Copyright (C) 2021-2025 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <dlfcn.h>
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+#include <link.h>
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+#include <stdbool.h>
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+#include <stdio.h>
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+#include <unistd.h>
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+
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+unsigned int
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+la_version (unsigned int version)
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+{
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+ /* Open some modules, to trigger DTV resizing before the switch to
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+ the main malloc. */
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+ for (int i = 1; i <= 19; ++i)
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+ {
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+ char dso[30];
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+ snprintf (dso, sizeof (dso), "tst-tlsmod17a%d.so", i);
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+ char sym[30];
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+ snprintf (sym, sizeof(sym), "tlsmod17a%d", i);
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+
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+ void *handle = dlopen (dso, RTLD_LAZY);
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+ if (handle == NULL)
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+ {
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+ printf ("error: dlmopen from auditor: %s\n", dlerror ());
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+ fflush (stdout);
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+ _exit (1);
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+ }
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+ int (*func) (void) = dlsym (handle, sym);
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+ if (func == NULL)
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+ {
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+ printf ("error: dlsym from auditor: %s\n", dlerror ());
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+ fflush (stdout);
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+ _exit (1);
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+ }
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+ /* Trigger TLS allocation. */
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+ func ();
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+ }
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+
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+ puts ("info: TLS-using modules loaded from auditor");
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+ fflush (stdout);
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+
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+ return LAV_CURRENT;
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+}
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@ -157,7 +157,7 @@ end \
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Summary: The GNU libc libraries
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Name: glibc
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Version: %{glibcversion}
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Release: 191%{?dist}
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Release: 192%{?dist}
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# In general, GPLv2+ is used by programs, LGPLv2+ is used for
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# libraries.
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@ -1199,6 +1199,7 @@ Patch891: glibc-RHEL-68805-9.patch
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Patch892: glibc-RHEL-63210.patch
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Patch893: glibc-RHEL-65355-1.patch
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Patch894: glibc-RHEL-65355-2.patch
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Patch895: glibc-RHEL-71922.patch
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##############################################################################
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# Continued list of core "glibc" package information:
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@ -3192,6 +3193,9 @@ update_gconv_modules_cache ()
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%endif
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%changelog
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* Thu May 15 2025 Patsy Griffin <patsy@redhat.com> - 2.34-192
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- elf: Keep using minimal malloc after early DTV resize (RHEL-71922)
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* Wed May 14 2025 Frédéric Bérat <fberat@redhat.com> - 2.34-191
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- Improve POSIX semaphore documentation (RHEL-65355)
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