d7703d3176
The fix for BZ#22716 replacde LD_TRACE_LOADED_OBJECTS with LD_TRACE_PRELINKING so mtrace could record executable address position. To provide the same information, LD_TRACE_LOADED_OBJECTS is extended where a value or '2' also prints the executable address as well. It avoid adding another loader environment variable to be used solely for mtrace. The vDSO will be printed as a default library (with '=>' pointing the same name), which is ok since both mtrace and ldd already handles it. The mtrace script is changed to also parse the new format. To correctly support PIE and non-PIE executables, both the default mtrace address and the one calculated as used (it fixes mtrace for non-PIE exectuable as for BZ#22716 for PIE). Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/* Information collection during ld.so startup.
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Copyright (C) 1995-2022 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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#ifndef _DL_MAIN
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#define _DL_MAIN
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#include <ldsodefs.h>
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#include <limits.h>
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#include <stdlib.h>
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/* Length limits for names and paths, to protect the dynamic linker,
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particularly when __libc_enable_secure is active. */
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#ifdef NAME_MAX
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# define SECURE_NAME_LIMIT NAME_MAX
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#else
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# define SECURE_NAME_LIMIT 255
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#endif
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#ifdef PATH_MAX
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# define SECURE_PATH_LIMIT PATH_MAX
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#else
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# define SECURE_PATH_LIMIT 1024
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#endif
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/* Strings containing colon-separated lists of audit modules. */
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struct audit_list
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{
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/* Array of strings containing colon-separated path lists. Each
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audit module needs its own namespace, so pre-allocate the largest
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possible list. */
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const char *audit_strings[DL_NNS];
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/* Number of entries added to audit_strings. */
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size_t length;
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/* Index into the audit_strings array (for the iteration phase). */
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size_t current_index;
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/* Tail of audit_strings[current_index] which still needs
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processing. */
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const char *current_tail;
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/* Scratch buffer for returning a name which is part of the strings
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in audit_strings. */
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char fname[SECURE_NAME_LIMIT];
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};
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/* This is a list of all the modes the dynamic loader can be in. */
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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_list_diagnostics, rtld_mode_help,
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};
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/* Aggregated state information extracted from environment variables
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and the ld.so command line. */
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struct dl_main_state
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{
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struct audit_list audit_list;
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/* The library search path. */
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const char *library_path;
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/* Where library_path comes from. LD_LIBRARY_PATH or --library-path. */
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const char *library_path_source;
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/* The list preloaded objects from LD_PRELOAD. */
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const char *preloadlist;
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/* The preload list passed as a command argument. */
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const char *preloadarg;
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/* Additional glibc-hwcaps subdirectories to search first.
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Colon-separated list. */
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const char *glibc_hwcaps_prepend;
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/* Mask for the internal glibc-hwcaps subdirectories.
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Colon-separated list. */
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const char *glibc_hwcaps_mask;
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enum rtld_mode mode;
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/* True if program should be also printed for rtld_mode_trace. */
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bool mode_trace_program;
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/* True if any of the debugging options is enabled. */
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bool any_debug;
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/* True if information about versions has to be printed. */
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bool version_info;
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};
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/* Helper function to invoke _dl_init_paths with the right arguments
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from *STATE. */
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static inline void
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call_init_paths (const struct dl_main_state *state)
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{
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_dl_init_paths (state->library_path, state->library_path_source,
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state->glibc_hwcaps_prepend, state->glibc_hwcaps_mask);
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}
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/* Print ld.so usage information and exit. */
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_Noreturn void _dl_usage (const char *argv0, const char *wrong_option)
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attribute_hidden;
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/* Print ld.so version information and exit. */
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_Noreturn void _dl_version (void) attribute_hidden;
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/* Print ld.so --help output and exit. */
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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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