forked from Imagelibrary/binutils-gdb
be10a32638
should_validate_memtags uses value_as_address to evalute
whether an address for a value is tagged. The comments for
that function simply say, "Extract a value as a C pointer."
While that sounds innoncuous, that function calls coerce_array,
which will dereference any references. This is not what is
desired here.
This can be demonstrated on an MTE-enabled host, such as aarch64-
based Ampere (example taken from tests introduced in this patch):
(gdb) p b.get_foo ()
Could not validate memory tag: Value can't be converted to integer.
$2 = (const foo &) @0xffffffffed88: {m_a = 42}
While the command completes, gdb didn't actually attempt to
evaluate any memory tags.
Fix this by using unpack_pointer instead.
Tested on x86_64 Fedora 40 and aarch64 RHEL 9.6.
42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2025 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Test that we can access class method/data member via reference. */
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struct foo
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{
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foo () : m_a (42) {}
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int get_a () const { return m_a; }
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int m_a;
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};
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struct bar
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{
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bar () : m_foo () {}
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const foo &get_foo () const { return m_foo; }
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foo m_foo;
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};
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int
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main (int argc, char *argv[])
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{
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bar b;
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const foo &ref = b.get_foo ();
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int ret = ref.m_a; // breakpoint here
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ret += ref.get_a ();
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return ret;
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} |