From bc4775985c053b5eb9c5f0cea53ba74376ad1ac3 Mon Sep 17 00:00:00 2001 From: Scott Garman Date: Mon, 8 Aug 2022 20:48:32 +1200 Subject: [PATCH] poison system directories Patch adapted to binutils 2.23.2 and extended to use BR_COMPILER_PARANOID_UNSAFE_PATH by Thomas Petazzoni. [Gustavo: adapt to binutils 2.25] Signed-off-by: Thomas Petazzoni Signed-off-by: Gustavo Zacarias Upstream-Status: Inappropriate [distribution: codesourcery] Patch originally created by Mark Hatle, forward-ported to binutils 2.21 by Scott Garman. purpose: warn for uses of system directories when cross linking Code Merged from Sourcery G++ binutils 2.19 - 4.4-277 2008-07-02 Joseph Myers ld/ * ld.h (args_type): Add error_poison_system_directories. * ld.texinfo (--error-poison-system-directories): Document. * ldfile.c (ldfile_add_library_path): Check command_line.error_poison_system_directories. * ldmain.c (main): Initialize command_line.error_poison_system_directories. * lexsup.c (enum option_values): Add OPTION_ERROR_POISON_SYSTEM_DIRECTORIES. (ld_options): Add --error-poison-system-directories. (parse_args): Handle new option. 2007-06-13 Joseph Myers ld/ * config.in: Regenerate. * ld.h (args_type): Add poison_system_directories. * ld.texinfo (--no-poison-system-directories): Document. * ldfile.c (ldfile_add_library_path): Check command_line.poison_system_directories. * ldmain.c (main): Initialize command_line.poison_system_directories. * lexsup.c (enum option_values): Add OPTION_NO_POISON_SYSTEM_DIRECTORIES. (ld_options): Add --no-poison-system-directories. (parse_args): Handle new option. 2007-04-20 Joseph Myers Merge from Sourcery G++ binutils 2.17: 2007-03-20 Joseph Myers Based on patch by Mark Hatle . ld/ * configure.ac (--enable-poison-system-directories): New option. * configure, config.in: Regenerate. * ldfile.c (ldfile_add_library_path): If ENABLE_POISON_SYSTEM_DIRECTORIES defined, warn for use of /lib, /usr/lib, /usr/local/lib or /usr/X11R6/lib. Signed-off-by: Mark Hatle Signed-off-by: Scott Garman --- ld/config.in | 3 +++ ld/configure | 14 ++++++++++++++ ld/configure.ac | 10 ++++++++++ ld/ld.h | 8 ++++++++ ld/ld.texi | 12 ++++++++++++ ld/ldfile.c | 17 +++++++++++++++++ ld/ldlex.h | 2 ++ ld/ldmain.c | 2 ++ ld/lexsup.c | 21 +++++++++++++++++++++ 9 files changed, 89 insertions(+) --- a/ld/config.in +++ b/ld/config.in @@ -58,6 +58,9 @@ language is requested. */ #undef ENABLE_NLS +/* Define to warn for use of native system library directories */ +#undef ENABLE_POISON_SYSTEM_DIRECTORIES + /* Additional extension a shared object might have. */ #undef EXTRA_SHLIB_EXTENSION --- a/ld/configure +++ b/ld/configure @@ -839,6 +839,7 @@ enable_targets enable_64_bit_bfd with_sysroot +enable_poison_system_directories enable_gold enable_got enable_compressed_debug_sections @@ -1521,6 +1522,8 @@ --enable-checking enable run-time checks --enable-targets alternative target configurations --enable-64-bit-bfd 64-bit support (on hosts with narrower word sizes) + --enable-poison-system-directories + warn for use of native system library directories --enable-gold[=ARG] build gold [ARG={default,yes,no}] --enable-got= GOT handling scheme (target, single, negative, multigot) @@ -15504,7 +15507,18 @@ fi +# Check whether --enable-poison-system-directories was given. +if test "${enable_poison_system_directories+set}" = set; then : + enableval=$enable_poison_system_directories; +else + enable_poison_system_directories=no +fi + +if test "x${enable_poison_system_directories}" = "xyes"; then +$as_echo "#define ENABLE_POISON_SYSTEM_DIRECTORIES 1" >>confdefs.h + +fi # Check whether --enable-got was given. if test "${enable_got+set}" = set; then : --- a/ld/configure.ac +++ b/ld/configure.ac @@ -103,6 +103,16 @@ AC_SUBST(TARGET_SYSTEM_ROOT) AC_SUBST(TARGET_SYSTEM_ROOT_DEFINE) +AC_ARG_ENABLE([poison-system-directories], + AS_HELP_STRING([--enable-poison-system-directories], + [warn for use of native system library directories]),, + [enable_poison_system_directories=no]) +if test "x${enable_poison_system_directories}" = "xyes"; then + AC_DEFINE([ENABLE_POISON_SYSTEM_DIRECTORIES], + [1], + [Define to warn for use of native system library directories]) +fi + dnl Use --enable-gold to decide if this linker should be the default. dnl "install_as_default" is set to false if gold is the default linker. dnl "installed_linker" is the installed BFD linker name. --- a/ld/ld.h +++ b/ld/ld.h @@ -158,6 +158,14 @@ /* If set, display the target memory usage (per memory region). */ bool print_memory_usage; + /* If TRUE (the default) warn for uses of system directories when + cross linking. */ + bool poison_system_directories; + + /* If TRUE (default FALSE) give an error for uses of system + directories when cross linking instead of a warning. */ + bool error_poison_system_directories; + /* Should we force section groups to be resolved? Controlled with --force-group-allocation on the command line or FORCE_GROUP_ALLOCATION in the linker script. */ --- a/ld/ld.texi +++ b/ld/ld.texi @@ -2960,6 +2960,18 @@ occurrence of the --package-metdata option. If the linker has been built with libjansson, then the JSON string will be validated. + +@kindex --no-poison-system-directories +@item --no-poison-system-directories +Do not warn for @option{-L} options using system directories such as +@file{/usr/lib} when cross linking. This option is intended for use +in chroot environments when such directories contain the correct +libraries for the target system rather than the host. + +@kindex --error-poison-system-directories +@item --error-poison-system-directories +Give an error instead of a warning for @option{-L} options using +system directories when cross linking. @end table @c man end --- a/ld/ldfile.c +++ b/ld/ldfile.c @@ -117,6 +117,23 @@ new_dirs->name = concat (ld_sysroot, name + strlen ("$SYSROOT"), (const char *) NULL); else new_dirs->name = xstrdup (name); + +#ifdef ENABLE_POISON_SYSTEM_DIRECTORIES + if (command_line.poison_system_directories + && ((!strncmp (name, "/lib", 4)) + || (!strncmp (name, "/usr/lib", 8)) + || (!strncmp (name, "/usr/local/lib", 14)) + || (!strncmp (name, "/usr/X11R6/lib", 14)))) + { + if (command_line.error_poison_system_directories) + einfo (_("%X%P: error: library search path \"%s\" is unsafe for " + "cross-compilation\n"), name); + else + einfo (_("%P: warning: library search path \"%s\" is unsafe for " + "cross-compilation\n"), name); + } +#endif + } /* Try to open a BFD for a lang_input_statement. */ --- a/ld/ldlex.h +++ b/ld/ldlex.h @@ -170,6 +170,8 @@ OPTION_NO_WARN_EXECSTACK, OPTION_WARN_RWX_SEGMENTS, OPTION_NO_WARN_RWX_SEGMENTS, + OPTION_NO_POISON_SYSTEM_DIRECTORIES, + OPTION_ERROR_POISON_SYSTEM_DIRECTORIES, }; /* The initial parser states. */ --- a/ld/ldmain.c +++ b/ld/ldmain.c @@ -321,6 +321,8 @@ command_line.warn_mismatch = true; command_line.warn_search_mismatch = true; command_line.check_section_addresses = -1; + command_line.poison_system_directories = true; + command_line.error_poison_system_directories = true; /* We initialize DEMANGLING based on the environment variable COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the --- a/ld/lexsup.c +++ b/ld/lexsup.c @@ -613,6 +613,14 @@ " is: share-unconflicted (default),\n" " share-duplicated"), TWO_DASHES }, + { {"no-poison-system-directories", no_argument, NULL, + OPTION_NO_POISON_SYSTEM_DIRECTORIES}, + '\0', NULL, N_("Do not warn for -L options using system directories"), + TWO_DASHES }, + { {"error-poison-system-directories", no_argument, NULL, + OPTION_ERROR_POISON_SYSTEM_DIRECTORIES}, + '\0', NULL, N_("Give an error for -L options using system directories"), + TWO_DASHES }, }; #define OPTION_COUNT ARRAY_SIZE (ld_options) @@ -625,6 +633,7 @@ int ingroup = 0; char *default_dirlist = NULL; char *shortopts; + char *BR_paranoid_env; struct option *longopts; struct option *really_longopts; int last_optind; @@ -1692,6 +1701,14 @@ } break; + case OPTION_NO_POISON_SYSTEM_DIRECTORIES: + command_line.poison_system_directories = false; + break; + + case OPTION_ERROR_POISON_SYSTEM_DIRECTORIES: + command_line.error_poison_system_directories = true; + break; + case OPTION_PUSH_STATE: input_flags.pushed = xmemdup (&input_flags, sizeof (input_flags), @@ -1837,6 +1854,10 @@ command_line.soname = NULL; } + BR_paranoid_env = getenv("BR_COMPILER_PARANOID_UNSAFE_PATH"); + if (BR_paranoid_env && strlen(BR_paranoid_env) > 0) + command_line.error_poison_system_directories = true; + while (ingroup) { einfo (_("%P: missing --end-group; added as last command line option\n"));