mirror of
https://sourceware.org/git/glibc.git
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ld.so: Implement the --list-diagnostics option
This commit is contained in:
parent
40d055a2dd
commit
851f32cf7b
4
NEWS
4
NEWS
@ -14,6 +14,10 @@ Major new features:
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constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
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and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ).
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* The dynamic linker implements the --list-diagnostics option, printing
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a dump of information related to IFUNC resolver operation and
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glibc-hwcaps subdirectory selection.
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Deprecated and removed features, and other changes affecting compatibility:
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[Add deprecations, removals and changes affecting compatibility here]
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@ -66,7 +66,7 @@ elide-routines.os = $(all-dl-routines) dl-support enbl-secure dl-origin \
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# interpreter and operating independent of libc.
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rtld-routines = rtld $(all-dl-routines) dl-sysdep dl-environ dl-minimal \
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dl-error-minimal dl-conflict dl-hwcaps dl-hwcaps_split dl-hwcaps-subdirs \
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dl-usage
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dl-usage dl-diagnostics dl-diagnostics-kernel dl-diagnostics-cpu
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all-rtld-routines = $(rtld-routines) $(sysdep-rtld-routines)
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CFLAGS-dl-runtime.c += -fexceptions -fasynchronous-unwind-tables
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@ -677,6 +677,9 @@ CFLAGS-cache.c += $(SYSCONF-FLAGS)
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CFLAGS-rtld.c += $(SYSCONF-FLAGS)
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CFLAGS-dl-usage.c += $(SYSCONF-FLAGS) \
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-D'RTLD="$(rtlddir)/$(rtld-installed-name)"'
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CFLAGS-dl-diagnostics.c += $(SYSCONF-FLAGS) \
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-D'PREFIX="$(prefix)"' \
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-D'RTLD="$(rtlddir)/$(rtld-installed-name)"'
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cpp-srcs-left := $(all-rtld-routines:=.os)
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lib := rtld
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24
elf/dl-diagnostics-cpu.c
Normal file
24
elf/dl-diagnostics-cpu.c
Normal file
@ -0,0 +1,24 @@
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/* Print CPU diagnostics data in ld.so. Stub version.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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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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#include <dl-diagnostics.h>
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void
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_dl_diagnostics_cpu (void)
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{
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}
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24
elf/dl-diagnostics-kernel.c
Normal file
24
elf/dl-diagnostics-kernel.c
Normal file
@ -0,0 +1,24 @@
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/* Print kernel diagnostics data in ld.so. Stub version.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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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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#include <dl-diagnostics.h>
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void
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_dl_diagnostics_kernel (void)
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{
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}
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265
elf/dl-diagnostics.c
Normal file
265
elf/dl-diagnostics.c
Normal file
@ -0,0 +1,265 @@
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/* Print diagnostics data in ld.so.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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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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#include <gnu/lib-names.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <dl-diagnostics.h>
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#include <dl-hwcaps.h>
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#include <dl-main.h>
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#include <dl-procinfo.h>
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#include <dl-sysdep.h>
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#include <ldsodefs.h>
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#include "trusted-dirs.h"
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#include "version.h"
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/* Write CH to standard output. */
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static void
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_dl_putc (char ch)
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{
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_dl_write (STDOUT_FILENO, &ch, 1);
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}
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/* Print CH to standard output, quoting it if necessary. */
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static void
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print_quoted_char (char ch)
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{
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if (ch < ' ' || ch > '~')
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{
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char buf[4];
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buf[0] = '\\';
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buf[1] = '0' + ((ch >> 6) & 7);
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buf[2] = '0' + ((ch >> 6) & 7);
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buf[3] = '0' + (ch & 7);
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_dl_write (STDOUT_FILENO, buf, 4);
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}
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else
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{
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if (ch == '\\' || ch == '"')
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_dl_putc ('\\');
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_dl_putc (ch);
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}
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}
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/* Print S of LEN bytes to standard output, quoting characters as
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needed. */
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static void
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print_string_length (const char *s, size_t len)
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{
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_dl_putc ('"');
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for (size_t i = 0; i < len; ++i)
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print_quoted_char (s[i]);
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_dl_putc ('"');
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}
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void
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_dl_diagnostics_print_string (const char *s)
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{
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if (s == NULL)
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{
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_dl_printf ("0x0");
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return;
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}
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_dl_putc ('"');
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while (*s != '\0')
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{
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print_quoted_char (*s);
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++s;
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}
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_dl_putc ('"');
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}
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void
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_dl_diagnostics_print_labeled_string (const char *label, const char *s)
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{
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_dl_printf ("%s=", label);
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_dl_diagnostics_print_string (s);
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_dl_putc ('\n');
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}
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void
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_dl_diagnostics_print_labeled_value (const char *label, uint64_t value)
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{
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if (sizeof (value) == sizeof (unsigned long int))
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/* _dl_printf can print 64-bit values directly. */
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_dl_printf ("%s=0x%lx\n", label, (unsigned long int) value);
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else
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{
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uint32_t high = value >> 32;
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uint32_t low = value;
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if (high == 0)
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_dl_printf ("%s=0x%x\n", label, low);
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else
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_dl_printf ("%s=0x%x%08x\n", label, high, low);
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}
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}
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/* Return true if ENV is an unfiltered environment variable. */
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static bool
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unfiltered_envvar (const char *env, size_t *name_length)
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{
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char *env_equal = strchr (env, '=');
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if (env_equal == NULL)
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{
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/* Always dump malformed entries. */
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*name_length = strlen (env);
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return true;
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}
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size_t envname_length = env_equal - env;
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*name_length = envname_length;
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/* LC_ and LD_ variables. */
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if (env[0] == 'L' && (env[1] == 'C' || env[1] == 'D')
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&& env[2] == '_')
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return true;
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/* MALLOC_ variables. */
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if (strncmp (env, "MALLOC_", strlen ("MALLOC_")) == 0)
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return true;
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static const char unfiltered[] =
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"DATEMSK\0"
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"GCONV_PATH\0"
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"GETCONF_DIR\0"
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"GETCONF_DIR\0"
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"GLIBC_TUNABLES\0"
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"GMON_OUTPUT_PREFIX\0"
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"HESIOD_CONFIG\0"
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"HES_DOMAIN\0"
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"HOSTALIASES\0"
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"I18NPATH\0"
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"IFS\0"
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"LANG\0"
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"LOCALDOMAIN\0"
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"LOCPATH\0"
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"MSGVERB\0"
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"NIS_DEFAULTS\0"
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"NIS_GROUP\0"
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"NIS_PATH\0"
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"NLSPATH\0"
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"PATH\0"
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"POSIXLY_CORRECT\0"
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"RESOLV_HOST_CONF\0"
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"RES_OPTIONS\0"
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"SEV_LEVEL\0"
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"TMPDIR\0"
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"TZ\0"
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"TZDIR\0"
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/* Two null bytes at the end to mark the end of the list via an
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empty substring. */
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;
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for (const char *candidate = unfiltered; *candidate != '\0'; )
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{
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size_t candidate_length = strlen (candidate);
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if (candidate_length == envname_length
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&& memcmp (candidate, env, candidate_length) == 0)
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return true;
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candidate += candidate_length + 1;
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}
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return false;
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}
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/* Dump the process environment. */
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static void
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print_environ (char **environ)
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{
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unsigned int index = 0;
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for (char **envp = environ; *envp != NULL; ++envp)
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{
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char *env = *envp;
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size_t name_length;
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bool unfiltered = unfiltered_envvar (env, &name_length);
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_dl_printf ("env%s[0x%x]=",
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unfiltered ? "" : "_filtered", index);
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if (unfiltered)
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_dl_diagnostics_print_string (env);
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else
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print_string_length (env, name_length);
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_dl_putc ('\n');
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++index;
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}
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}
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/* Print configured paths and the built-in search path. */
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static void
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print_paths (void)
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{
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_dl_diagnostics_print_labeled_string ("path.prefix", PREFIX);
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_dl_diagnostics_print_labeled_string ("path.rtld", RTLD);
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_dl_diagnostics_print_labeled_string ("path.sysconfdir", SYSCONFDIR);
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unsigned int index = 0;
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static const char *system_dirs = SYSTEM_DIRS "\0";
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for (const char *e = system_dirs; *e != '\0'; )
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{
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size_t len = strlen (e);
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_dl_printf ("path.system_dirs[0x%x]=", index);
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print_string_length (e, len);
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_dl_putc ('\n');
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++index;
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e += len + 1;
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}
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}
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/* Print information about the glibc version. */
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static void
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print_version (void)
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{
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_dl_diagnostics_print_labeled_string ("version.release", RELEASE);
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_dl_diagnostics_print_labeled_string ("version.version", VERSION);
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}
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void
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_dl_print_diagnostics (char **environ)
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{
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#ifdef HAVE_DL_DISCOVER_OSVERSION
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_dl_diagnostics_print_labeled_value
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("dl_discover_osversion", _dl_discover_osversion ());
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#endif
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_dl_diagnostics_print_labeled_string ("dl_dst_lib", DL_DST_LIB);
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_dl_diagnostics_print_labeled_value ("dl_hwcap", GLRO (dl_hwcap));
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_dl_diagnostics_print_labeled_value ("dl_hwcap_important", HWCAP_IMPORTANT);
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_dl_diagnostics_print_labeled_value ("dl_hwcap2", GLRO (dl_hwcap2));
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_dl_diagnostics_print_labeled_string
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("dl_hwcaps_subdirs", _dl_hwcaps_subdirs);
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_dl_diagnostics_print_labeled_value
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("dl_hwcaps_subdirs_active", _dl_hwcaps_subdirs_active ());
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_dl_diagnostics_print_labeled_value ("dl_osversion", GLRO (dl_osversion));
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_dl_diagnostics_print_labeled_value ("dl_pagesize", GLRO (dl_pagesize));
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_dl_diagnostics_print_labeled_string ("dl_platform", GLRO (dl_platform));
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_dl_diagnostics_print_labeled_string
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("dl_profile_output", GLRO (dl_profile_output));
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_dl_diagnostics_print_labeled_value
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("dl_string_platform", _dl_string_platform ( GLRO (dl_platform)));
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_dl_diagnostics_print_labeled_string ("dso.ld", LD_SO);
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_dl_diagnostics_print_labeled_string ("dso.libc", LIBC_SO);
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print_environ (environ);
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print_paths ();
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print_version ();
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_dl_diagnostics_kernel ();
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_dl_diagnostics_cpu ();
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_exit (EXIT_SUCCESS);
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}
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46
elf/dl-diagnostics.h
Normal file
46
elf/dl-diagnostics.h
Normal file
@ -0,0 +1,46 @@
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/* Interfaces for printing diagnostics in ld.so.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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#ifndef _DL_DIAGNOSTICS_H
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#define _DL_DIAGNOSTICS_H
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#include <stdint.h>
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/* Write the null-terminated string to standard output, surrounded in
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quotation marks. */
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void _dl_diagnostics_print_string (const char *s) attribute_hidden;
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/* Like _dl_diagnostics_print_string, but add a LABEL= prefix, and a
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newline character as a suffix. */
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void _dl_diagnostics_print_labeled_string (const char *label, const char *s)
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attribute_hidden;
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/* Print LABEL=VALUE to standard output, followed by a newline
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character. */
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void _dl_diagnostics_print_labeled_value (const char *label, uint64_t value)
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attribute_hidden;
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/* Print diagnostics data for the kernel. Called from
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_dl_print_diagnostics. */
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void _dl_diagnostics_kernel (void) attribute_hidden;
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/* Print diagnostics data for the CPU(s). Called from
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_dl_print_diagnostics. */
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void _dl_diagnostics_cpu (void) attribute_hidden;
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#endif /* _DL_DIAGNOSTICS_H */
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@ -63,7 +63,7 @@ struct audit_list
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enum rtld_mode
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{
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rtld_mode_normal, rtld_mode_list, rtld_mode_verify, rtld_mode_trace,
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rtld_mode_list_tunables, rtld_mode_help,
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rtld_mode_list_tunables, rtld_mode_list_diagnostics, rtld_mode_help,
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};
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/* Aggregated state information extracted from environment variables
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@ -121,4 +121,7 @@ _Noreturn void _dl_version (void) attribute_hidden;
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_Noreturn void _dl_help (const char *argv0, struct dl_main_state *state)
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attribute_hidden;
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/* Print a diagnostics dump. */
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_Noreturn void _dl_print_diagnostics (char **environ) attribute_hidden;
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#endif /* _DL_MAIN */
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|
@ -261,6 +261,7 @@ setting environment variables (which would be inherited by subprocesses).\n\
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--list-tunables list all tunables with minimum and maximum values\n"
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#endif
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"\
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--list-diagnostics list diagnostics information\n\
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--help display this help and exit\n\
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--version output version information and exit\n\
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\n\
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|
18
elf/rtld.c
18
elf/rtld.c
@ -141,6 +141,7 @@ static void dl_main_state_init (struct dl_main_state *state);
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/* Process all environments variables the dynamic linker must recognize.
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Since all of them start with `LD_' we are a bit smarter while finding
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all the entries. */
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extern char **_environ attribute_hidden;
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static void process_envvars (struct dl_main_state *state);
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#ifdef DL_ARGV_NOT_RELRO
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@ -1287,6 +1288,14 @@ dl_main (const ElfW(Phdr) *phdr,
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++_dl_argv;
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}
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#endif
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else if (! strcmp (_dl_argv[1], "--list-diagnostics"))
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{
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state.mode = rtld_mode_list_diagnostics;
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++_dl_skip_args;
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--_dl_argc;
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++_dl_argv;
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}
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else if (strcmp (_dl_argv[1], "--help") == 0)
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{
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state.mode = rtld_mode_help;
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@ -1315,6 +1324,9 @@ dl_main (const ElfW(Phdr) *phdr,
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}
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#endif
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if (state.mode == rtld_mode_list_diagnostics)
|
||||
_dl_print_diagnostics (_environ);
|
||||
|
||||
/* If we have no further argument the program was called incorrectly.
|
||||
Grant the user some education. */
|
||||
if (_dl_argc < 2)
|
||||
@ -2649,12 +2661,6 @@ a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n");
|
||||
}
|
||||
}
|
||||
|
||||
/* Process all environments variables the dynamic linker must recognize.
|
||||
Since all of them start with `LD_' we are a bit smarter while finding
|
||||
all the entries. */
|
||||
extern char **_environ attribute_hidden;
|
||||
|
||||
|
||||
static void
|
||||
process_envvars (struct dl_main_state *state)
|
||||
{
|
||||
|
77
sysdeps/unix/sysv/linux/dl-diagnostics-kernel.c
Normal file
77
sysdeps/unix/sysv/linux/dl-diagnostics-kernel.c
Normal file
@ -0,0 +1,77 @@
|
||||
/* Print kernel diagnostics data in ld.so. Linux version.
|
||||
Copyright (C) 2021 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 <dl-diagnostics.h>
|
||||
#include <ldsodefs.h>
|
||||
#include <sys/utsname.h>
|
||||
|
||||
/* Dump the auxiliary vector to standard output. */
|
||||
static void
|
||||
print_auxv (void)
|
||||
{
|
||||
/* See _dl_show_auxv. The code below follows the general output
|
||||
format for diagnostic dumps. */
|
||||
unsigned int index = 0;
|
||||
for (ElfW(auxv_t) *av = GLRO(dl_auxv); av->a_type != AT_NULL; ++av)
|
||||
{
|
||||
_dl_printf ("auxv[0x%x].a_type=0x%lx\n"
|
||||
"auxv[0x%x].a_val=",
|
||||
index, (unsigned long int) av->a_type, index);
|
||||
if (av->a_type == AT_EXECFN
|
||||
|| av->a_type == AT_PLATFORM
|
||||
|| av->a_type == AT_BASE_PLATFORM)
|
||||
/* The address of the strings is not useful at all, so print
|
||||
the strings themselvs. */
|
||||
_dl_diagnostics_print_string ((const char *) av->a_un.a_val);
|
||||
else
|
||||
_dl_printf ("0x%lx", (unsigned long int) av->a_un.a_val);
|
||||
_dl_printf ("\n");
|
||||
++index;
|
||||
}
|
||||
}
|
||||
|
||||
/* Print one uname entry. */
|
||||
static void
|
||||
print_utsname_entry (const char *field, const char *value)
|
||||
{
|
||||
_dl_printf ("uname.");
|
||||
_dl_diagnostics_print_labeled_string (field, value);
|
||||
}
|
||||
|
||||
/* Print information from uname, including the kernel version. */
|
||||
static void
|
||||
print_uname (void)
|
||||
{
|
||||
struct utsname uts;
|
||||
if (__uname (&uts) == 0)
|
||||
{
|
||||
print_utsname_entry ("sysname", uts.sysname);
|
||||
print_utsname_entry ("nodename", uts.nodename);
|
||||
print_utsname_entry ("release", uts.release);
|
||||
print_utsname_entry ("version", uts.version);
|
||||
print_utsname_entry ("machine", uts.machine);
|
||||
print_utsname_entry ("domainname", uts.domainname);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
_dl_diagnostics_kernel (void)
|
||||
{
|
||||
print_auxv ();
|
||||
print_uname ();
|
||||
}
|
Loading…
Reference in New Issue
Block a user