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From ce92e458506aec5bc5516a771e26b0f907ce0db4 Mon Sep 17 00:00:00 2001
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From: Lianbo Jiang <lijiang@redhat.com>
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Date: Wed, 26 Jan 2022 20:32:35 +0800
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Subject: [PATCH 07/10] GDB: fix completion related libstdc++ assert
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Currently crash built with some specific flags (-D_GLIBCXX_ASSERTIONS
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and etc.) may abort and print the following error when running the gdb
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list command or tab-completion of symbols. For example:
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crash> l panic
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/usr/include/c++/11/string_view:234: ...
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Aborted (core dumped)
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crash> p "TAB completion"
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crash> p /usr/include/c++/11/string_view:234: ...
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Aborted (core dumped)
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When the name string is null (the length of name is zero), there are
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multiple places where array access is out of bounds in the gdb/ada-lang.c
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(see ada_fold_name() and ada_lookup_name_info()).
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The patch backports these gdb patches:
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6a780b676637 ("Fix completion related libstdc++ assert when using -D_GLIBCXX_DEBUG")
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2ccee230f830 ("Fix off-by-one error in ada_fold_name")
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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gdb-10.2.patch | 31 +++++++++++++++++++++++++++++++
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1 file changed, 31 insertions(+)
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diff --git a/gdb-10.2.patch b/gdb-10.2.patch
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index 1332b6638028..f5e4c06e6f97 100644
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--- a/gdb-10.2.patch
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+++ b/gdb-10.2.patch
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@@ -1591,3 +1591,34 @@
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max += 2;
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limit = cols / max;
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if (limit != 1 && (limit * max == cols))
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+--- gdb-10.2/gdb/ada-lang.c.orig
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++++ gdb-10.2/gdb/ada-lang.c
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+@@ -997,7 +997,7 @@ ada_fold_name (gdb::string_view name)
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+ int len = name.size ();
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+ GROW_VECT (fold_buffer, fold_buffer_size, len + 1);
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+
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+- if (name[0] == '\'')
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++ if (!name.empty () && name[0] == '\'')
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+ {
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+ strncpy (fold_buffer, name.data () + 1, len - 2);
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+ fold_buffer[len - 2] = '\000';
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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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+
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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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+
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+ return fold_buffer;
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+@@ -13596,7 +13597,7 @@ ada_lookup_name_info::ada_lookup_name_info (const lookup_name_info &lookup_name)
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+ {
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+ gdb::string_view user_name = lookup_name.name ();
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+
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+- if (user_name[0] == '<')
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++ if (!user_name.empty () && user_name[0] == '<')
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+ {
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+ if (user_name.back () == '>')
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+ m_encoded_name
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--
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2.20.1
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