From FEDORA_PATCHES Mon Sep 17 00:00:00 2001 From: Fedora GDB patches Date: Fri, 27 Oct 2017 21:07:50 +0200 Subject: gdb-glibc-strstr-workaround.patch ;; Workaround PR libc/14166 for inferior calls of strstr. ;;=fedora: Compatibility with RHELs (unchecked which ones). diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c --- a/gdb/dwarf2read.c +++ b/gdb/dwarf2read.c @@ -21286,6 +21286,26 @@ new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu, /* Cache this symbol's name and the name's demangled form (if any). */ SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack); linkagename = dwarf2_physname (name, die, cu); + + /* Workaround for: + * invalid IFUNC DW_AT_linkage_name: memmove strstr time + * http://sourceware.org/bugzilla/show_bug.cgi?id=14166 */ + if (strcmp (linkagename, "strstr") == 0 + && strstr (objfile_name (objfile), "/libc") != NULL) + { + struct objfile *objfile_msym; + struct bound_minimal_symbol bmsym; + + if (objfile->separate_debug_objfile_backlink) + objfile_msym = objfile->separate_debug_objfile_backlink; + else + objfile_msym = objfile; + bmsym = lookup_minimal_symbol ("strstr", NULL, objfile_msym); + if (bmsym.minsym != NULL + && MSYMBOL_TYPE (bmsym.minsym) == mst_text_gnu_ifunc) + linkagename = "__strstr"; + } + SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile); /* Fortran does not have mangling standard and the mangling does differ diff --git a/gdb/testsuite/gdb.base/gnu-ifunc-strstr-workaround.exp b/gdb/testsuite/gdb.base/gnu-ifunc-strstr-workaround.exp new file mode 100644 --- /dev/null +++ b/gdb/testsuite/gdb.base/gnu-ifunc-strstr-workaround.exp @@ -0,0 +1,108 @@ +# Copyright (C) 2012 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . + +# Workaround for: +# invalid IFUNC DW_AT_linkage_name: memmove strstr time +# http://sourceware.org/bugzilla/show_bug.cgi?id=14166 + +if {[skip_shlib_tests]} { + return 0 +} + +set testfile "gnu-ifunc-strstr-workaround" +set executable ${testfile} +set srcfile start.c +set binfile [standard_output_file ${executable}] + +if [prepare_for_testing ${testfile}.exp $executable $srcfile] { + return -1 +} + +if ![runto_main] { + return 0 +} + +set test "ptype atoi" +gdb_test_multiple $test $test { + -re "type = int \\(const char \\*\\)\r\n$gdb_prompt $" { + pass $test + } + -re "type = int \\(\\)\r\n$gdb_prompt $" { + untested "$test (no DWARF)" + return 0 + } +} + +set addr "" +set test "print strstr" +gdb_test_multiple $test $test { + -re " = {} (0x\[0-9a-f\]+) \r\n$gdb_prompt $" { + set addr $expect_out(1,string) + pass $test + } + -re " = {} (0x\[0-9a-f\]+) <__strstr>\r\n$gdb_prompt $" { + set addr $expect_out(1,string) + pass "$test (GDB workaround)" + } + -re " = {} (0x\[0-9a-f\]+) <__libc_strstr>\r\n$gdb_prompt $" { + set addr $expect_out(1,string) + pass "$test (fixed glibc)" + } + -re " = {char \\*\\(const char \\*, const char \\*\\)} 0x\[0-9a-f\]+ \r\n$gdb_prompt $" { + untested "$test (gnu-ifunc not in use by glibc)" + return 0 + } +} + +set test "info sym" +gdb_test_multiple "info sym $addr" $test { + -re "strstr in section \\.text of /lib\[^/\]*/libc.so.6\r\n$gdb_prompt $" { + pass $test + } + -re " = {char \\*\\(const char \\*, const char \\*\\)} 0x\[0-9a-f\]+ \r\n$gdb_prompt $" { + # unexpected + xfail "$test (not in libc.so.6)" + return 0 + } +} + +set test "info addr strstr" +gdb_test_multiple $test $test { + -re "Symbol \"strstr\" is a function at address $addr\\.\r\n$gdb_prompt $" { + fail "$test (DWARF for strstr)" + } + -re "Symbol \"strstr\" is at $addr in a file compiled without debugging\\.\r\n$gdb_prompt $" { + pass "$test" + } +} + +set test "print strstr second time" +gdb_test_multiple "print strstr" $test { + -re " = {} $addr \r\n$gdb_prompt $" { + pass $test + } + -re " = {} $addr <__strstr>\r\n$gdb_prompt $" { + pass "$test (GDB workaround)" + } + -re " = {} $addr <__libc_strstr>\r\n$gdb_prompt $" { + pass "$test (fixed glibc)" + } + -re " = {void \\*\\(void\\)} 0x\[0-9a-f\]+ \r\n$gdb_prompt $" { + fail $test + } +} + +gdb_test {print strstr("abc","b")} { = 0x[0-9a-f]+ "bc"} +gdb_test {print strstr("def","e")} { = 0x[0-9a-f]+ "ef"}