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From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Kevin Buettner <kevinb@redhat.com>
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Date: Tue, 8 Dec 2020 14:07:45 -0700
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Subject: gdb-rhbz1905996-fix-off-by-one-error-in-ada_fold_name.patch
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;; Fix off-by-one error in ada_fold_name.patch (RH BZ 1905996)
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;; Upstream patch proposal: https://sourceware.org/pipermail/gdb-patches/2020-December/173935.html
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;; =fedoratest
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Fix off-by-one error in ada_fold_name
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I'm seeing a libstdc++ assertion failure when running GDB's "maint selftest"
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command when GDB is configured with the following CFLAGS and CXXFLAGS as
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part of the configure line:
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CFLAGS='-D_GLIBCXX_DEBUG -g3 -O0' CXXFLAGS='-D_GLIBCXX_DEBUG -g3 -O0'
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This is what I see when running the self tests:
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(gdb) maint selftest
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Running selftest aarch64-analyze-prologue.
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Running selftest aarch64-process-record.
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Running selftest arm-record.
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Running selftest arm_analyze_prologue.
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Running selftest array_view.
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Running selftest child_path.
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Running selftest cli_utils.
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Running selftest command_structure_invariants.
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Running selftest copy_bitwise.
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Running selftest copy_integer_to_size.
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Running selftest cp_remove_params.
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Running selftest cp_symbol_name_matches.
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Running selftest dw2_expand_symtabs_matching.
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/usr/include/c++/11/string_view:211: constexpr const value_type& std::basic_string_view<_CharT, _Traits>::operator[](std::basic_string_view<_CharT, _Traits>::size_type) const [with _CharT = char; _Traits = std::char_traits<char>; std::basic_string_view<_CharT, _Traits>::const_reference = const char&; std::basic_string_view<_CharT, _Traits>::size_type = long unsigned int]: Assertion '__pos < this->_M_len' failed.
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Aborted (core dumped)
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Here's a partial stack trace:
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#0 0x00007ffff6ef6262 in raise () from /lib64/libc.so.6
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#1 0x00007ffff6edf8a4 in abort () from /lib64/libc.so.6
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#2 0x00000000004249bf in std::__replacement_assert (
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__file=0xef7480 "/usr/include/c++/11/string_view", __line=211,
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__function=0xef7328 "constexpr const value_type& std::basic_string_view<_CharT, _Traits>::operator[](std::basic_string_view<_CharT, _Traits>::size_type) const [with _CharT = char; _Traits = std::char_traits<char>; std::ba"...,
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__condition=0xef7311 "__pos < this->_M_len")
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at /usr/include/c++/11/x86_64-redhat-linux/bits/c++config.h:2624
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#3 0x0000000000451737 in std::basic_string_view<char, std::char_traits<char> >::operator[] (this=0x7fffffffc200, __pos=8)
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at /usr/include/c++/11/string_view:211
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#4 0x00000000004329f5 in ada_fold_name (name="function")
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at /ironwood1/sourceware-git/rawhide-master/bld/../../worktree-master/gdb/ada-lang.c:988
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And, looking at frame #4...
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(top-gdb) up 4
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at /ironwood1/sourceware-git/rawhide-master/bld/../../worktree-master/gdb/ada-lang.c:988
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988 fold_buffer[i] = tolower (name[i]);
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(top-gdb) p i
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$1 = 8
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(top-gdb) p name.size()
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$2 = 8
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My patch adjusts the comparison to only copy name.size() characters
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from the string. I've added a separate statement for NUL character
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termination of fold_buffer[].
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gdb/ChangeLog:
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* ada-lang.c (ada_fold_name): Fix off-by-one error.
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diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
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--- a/gdb/ada-lang.c
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+++ b/gdb/ada-lang.c
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@@ -1006,8 +1006,9 @@ ada_fold_name (gdb::string_view name)
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{
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int i;
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- for (i = 0; i <= len; i += 1)
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+ for (i = 0; i < len; i += 1)
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fold_buffer[i] = tolower (name[i]);
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+ fold_buffer[i] = '\0';
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}
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return fold_buffer;
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