Public bug reported:
This concerns libdpkg-perl 1.22.4ubuntu5 in Ubuntu noble.
In /usr/share/perl5/Dpkg/Vendor/Ubuntu.pm, there is this bit:
# Debian enables -fstack-clash-protection but it causes troubles on armhf
# (which are not fully analyzed as of writing this); disable it there in
# order to have time to investigate
if ($arch eq 'armhf') {
# Stack clash protector only available on amd64 and arm.
$flags->set_feature('hardening', 'stackclash', 0);
}
Then in /usr/share/perl5/Dpkg/Vendor/Debian.pm, this logic:
# Stack clash
if ($flags->use_feature('hardening', 'stackclash')) {
my $flag = '-fstack-clash-protection';
$flags->append($_, $flag) foreach @compile_flags;
} else {
my $flag = '-fno-stack-clash-protection';
$flags->append($_, $flag) foreach @compile_flags;
}
Which causes -fno-stack-clash-protection to be added to the package
build flags.
Unfortunately, in building Chromium for armhf on noble, I see this
(build log excerpt):
[27780/60083] CXX
obj/net/third_party/quiche/quiche/qpack_decoder_stream_receiver.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
[27781/60083] CXX
obj/net/third_party/quiche/quiche/qpack_encoder_stream_receiver.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
[27782/60083] CXX
obj/net/third_party/quiche/quiche/qpack_decoder_stream_sender.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
[27783/60083] CXX
obj/net/third_party/quiche/quiche/qpack_index_conversions.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
[27784/60083] CXX
obj/net/third_party/quiche/quiche/qpack_encoder_stream_sender.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
[27785/60083] CXX obj/net/third_party/quiche/quiche/qpack_encoder.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
[27786/60083] CXX
obj/net/third_party/quiche/quiche/qpack_instruction_decoder.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
[27787/60083] CXX obj/net/third_party/quiche/quiche/qpack_header_table.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
[27788/60083] CXX
obj/net/third_party/quiche/quiche/qpack_instruction_encoder.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
[27789/60083] CXX obj/net/third_party/quiche/quiche/qpack_instructions.o
clang++-16: warning: argument unused during compilation:
'-fno-stack-clash-protection' [-Wunused-command-line-argument]
Basically, *every* invocation of the C or C++ compiler gives this
warning.
I think the flag needs to be dropped altogether for armhf, not just
negated.
** Affects: dpkg (Ubuntu)
Importance: Undecided
Status: New
** Tags: noble
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https://bugs.launchpad.net/bugs/2059059
Title:
Problem with -fno-stack-clash-protection flag on armhf
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