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- From 2c43b1357db6b09d1645704afd3f45be6de0cf4d Mon Sep 17 00:00:00 2001
- From: Khem Raj <raj.khem@gmail.com>
- Date: Fri, 15 Jan 2016 06:31:09 +0000
- Subject: [PATCH] warn for uses of system directories when cross linking
- 2008-07-02 Joseph Myers <joseph@codesourcery.com>
- 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 <joseph@codesourcery.com>
- 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 <joseph@codesourcery.com>
- Merge from Sourcery G++ binutils 2.17:
- 2007-03-20 Joseph Myers <joseph@codesourcery.com>
- Based on patch by Mark Hatle <mark.hatle@windriver.com>.
- ld/
- * configure.in (--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.
- Upstream-Status: Pending
- Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
- Signed-off-by: Scott Garman <scott.a.garman@intel.com>
- Signed-off-by: Khem Raj <raj.khem@gmail.com>
- ---
- ld/config.in | 3 +++
- ld/configure | 16 ++++++++++++++++
- ld/configure.ac | 10 ++++++++++
- ld/ld.h | 8 ++++++++
- ld/ld.texi | 12 ++++++++++++
- ld/ldfile.c | 17 +++++++++++++++++
- ld/ldlex.h | 2 ++
- ld/ldmain.c | 6 ++++--
- ld/lexsup.c | 16 ++++++++++++++++
- 9 files changed, 88 insertions(+), 2 deletions(-)
- diff --git a/ld/config.in b/ld/config.in
- index d4c1fc420b5..1aece0b2c29 100644
- --- a/ld/config.in
- +++ b/ld/config.in
- @@ -55,6 +55,9 @@
- 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
-
- diff --git a/ld/configure b/ld/configure
- index e58fb7f3a35..d0a467ac101 100755
- --- a/ld/configure
- +++ b/ld/configure
- @@ -836,6 +836,7 @@ with_lib_path
- enable_targets
- enable_64_bit_bfd
- with_sysroot
- +enable_poison_system_directories
- enable_gold
- enable_got
- enable_compressed_debug_sections
- @@ -1514,6 +1515,8 @@ Optional Features:
- --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=<type> GOT handling scheme (target, single, negative,
- multigot)
- @@ -15349,6 +15352,19 @@ 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-gold was given.
- if test "${enable_gold+set}" = set; then :
- enableval=$enable_gold; case "${enableval}" in
- diff --git a/ld/configure.ac b/ld/configure.ac
- index 4331d6b1302..e2976bc2926 100644
- --- a/ld/configure.ac
- +++ b/ld/configure.ac
- @@ -102,6 +102,16 @@ AC_SUBST(use_sysroot)
- AC_SUBST(TARGET_SYSTEM_ROOT)
- AC_SUBST(TARGET_SYSTEM_ROOT_DEFINE)
-
- +AC_ARG_ENABLE([poison-system-directories],
- + AS_HELP_STRING([--enable-poison-system-directories],
- + [warn for use of native system library directories]),,
- + [enable_poison_system_directories=no])
- +if test "x${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.
- diff --git a/ld/ld.h b/ld/ld.h
- index f3086bf30de..db5064243c7 100644
- --- a/ld/ld.h
- +++ b/ld/ld.h
- @@ -162,6 +162,14 @@ typedef struct
- in the linker script. */
- bool force_group_allocation;
-
- + /* 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;
- +
- /* Big or little endian as set on command line. */
- enum endian_enum endian;
-
- diff --git a/ld/ld.texi b/ld/ld.texi
- index eabbec8faa9..c4680e4947e 100644
- --- a/ld/ld.texi
- +++ b/ld/ld.texi
- @@ -2947,6 +2947,18 @@ creation of the metadata note, if one had been enabled by an earlier
- 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
- diff --git a/ld/ldfile.c b/ld/ldfile.c
- index 731ae5f7aed..dd8f03fd960 100644
- --- a/ld/ldfile.c
- +++ b/ld/ldfile.c
- @@ -117,6 +117,23 @@ ldfile_add_library_path (const char *name, bool cmdline)
- 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. */
- diff --git a/ld/ldlex.h b/ld/ldlex.h
- index 57ade1f754b..64007ff8684 100644
- --- a/ld/ldlex.h
- +++ b/ld/ldlex.h
- @@ -168,6 +168,8 @@ enum option_values
- 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. */
- diff --git a/ld/ldmain.c b/ld/ldmain.c
- index 1ae90a77749..f40750fd816 100644
- --- a/ld/ldmain.c
- +++ b/ld/ldmain.c
- @@ -322,6 +322,8 @@ main (int argc, char **argv)
- 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 = false;
-
- /* We initialize DEMANGLING based on the environment variable
- COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
- @@ -1447,7 +1449,7 @@ undefined_symbol (struct bfd_link_info *info,
- argv[1] = "undefined-symbol";
- argv[2] = (char *) name;
- argv[3] = NULL;
- -
- +
- if (verbose)
- einfo (_("%P: About to run error handling script '%s' with arguments: '%s' '%s'\n"),
- argv[0], argv[1], argv[2]);
- @@ -1468,7 +1470,7 @@ undefined_symbol (struct bfd_link_info *info,
- carry on to issue the normal error message. */
- }
- #endif /* SUPPORT_ERROR_HANDLING_SCRIPT */
- -
- +
- if (section != NULL)
- {
- if (error_count < MAX_ERRORS_IN_A_ROW)
- diff --git a/ld/lexsup.c b/ld/lexsup.c
- index 9225f71b3ce..92fb66f1fa2 100644
- --- a/ld/lexsup.c
- +++ b/ld/lexsup.c
- @@ -608,6 +608,14 @@ static const struct ld_option ld_options[] =
- " <method> 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)
- @@ -1722,6 +1730,14 @@ parse_args (unsigned argc, char **argv)
- config.print_map_discarded = true;
- 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_DEPENDENCY_FILE:
- config.dependency_file = optarg;
- break;
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