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([2a02:8010:64ea:0:8eb8:7eff:fe53:9d5f]) by smtp.googlemail.com with ESMTPSA id m29-20020a05600c3b1d00b003c6b7f5567csm29150588wms.0.2022.11.28.09.53.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Nov 2022 09:53:17 -0800 (PST) Sender: Mark Harmstone Message-ID: <09f9d8ae-4dee-e056-6f7b-e70542097ffd@harmstone.com> Date: Mon, 28 Nov 2022 17:53:15 +0000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [PATCH] ld: Fix segfault in populate_publics_stream To: Jan Beulich References: <20221125025433.26818-1-mark@harmstone.com> <20221127023840.32080-1-mark@harmstone.com> <992f7462-5544-39fd-507c-bfeabf708db8@suse.com> Content-Language: en-US From: Mark Harmstone Cc: binutils@sourceware.org In-Reply-To: <992f7462-5544-39fd-507c-bfeabf708db8@suse.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: > Out of curiosity - which tree was this diff generated against? The > line number here looks to be off by several hundred from what I > see in the repo right now. This is inteded to be applied with the other patches in the series, the ones beginning with "[PATCH v2] ld: Generate PDB string table" at https://sourceware.org/pipermail/binutils/2022-November/thread.html. Sorry, this probably wasn't obvious from a mail client. I've not numbered them as I'm not sure how many more there'll be, and if I wait for the previous patches to be accepted before submitting the next, I'll almost certainly miss the cut-off for the code freeze. > Why / when would in->outsymbols be NULL but in->symcount be non-zero? Try running the test in the DEBUG_S_LINES patch without this one - it'll fail because ld segfaults. outsymbols doesn't get set from within generate_reloc for the second object file, as it only has one non-loadable section. The "symbols" come from the .equs I'm using like #defines. > And if that was possible, why would it not also be possible that the > array is smaller than in->symcount? bfd_generic_link_read_symbols is called for each loadable section, and allocates the outsymbols array once. It was my mistake when I submitted my original patch for populate_publics_stream, in not realizing that it would break for object files without any loadable sections. Mark