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[2.7.103.217]) by smtp.gmail.com with ESMTPSA id o13-20020a5d670d000000b0022cd0c8c696sm11087334wru.103.2022.10.18.05.13.47 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Oct 2022 05:13:47 -0700 (PDT) Message-ID: <259246b0-9592-3aa8-2a1a-52609ac5357c@gmail.com> Date: Tue, 18 Oct 2022 14:13:46 +0200 List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:102.0) Gecko/20100101 Thunderbird/102.3.2 Subject: Re: AMD64 14.0-CURRENT memory layout changes Content-Language: en-US From: Paul Floyd To: freebsd-hackers References: <578a011d-0c3f-3f91-48ca-17999a6515a9@gmail.com> In-Reply-To: <578a011d-0c3f-3f91-48ca-17999a6515a9@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4MsCSs4gtBz444Q X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b=cyJ8LFjy; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of paulf2718@gmail.com designates 2a00:1450:4864:20::42b as permitted sender) smtp.mailfrom=paulf2718@gmail.com X-Spamd-Result: default: False [-4.00 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-0.996]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; MIME_GOOD(-0.10)[text/plain]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; ARC_NA(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; RCVD_TLS_LAST(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::42b:from]; TO_DN_ALL(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; FREEMAIL_FROM(0.00)[gmail.com]; MID_RHS_MATCH_FROM(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; FREEMAIL_ENVFROM(0.00)[gmail.com]; MLMMJ_DEST(0.00)[freebsd-hackers@freebsd.org] X-ThisMailContainsUnwantedMimeParts: N > > How is 14.0 working out what address to use for the stack? > (The above is with ASLR all off) Answering my own question: it's in auxv (from __thr_get_main_stack_base) /usr/include/sys/elf_common.h:#define AT_USRSTACKBASE 35 /* Top of user stack */ I haven't yet added this (or AT_USRSTACKLIM) to the client auxv that Valgrind synthesizes. I'm still not certain that will fix it - I would have expected __thr_get_main_stack_base to fallback to using sysctl. A+ Paul