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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id m4-20020a170902db0400b0016c50179b1esm2058299plx.152.2022.11.17.16.34.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Nov 2022 16:34:16 -0800 (PST) From: Kees Cook To: Eric Biederman Cc: Kees Cook , David Hildenbrand , Linus Torvalds , Alexander Viro , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] exec: Remove FOLL_FORCE for stack setup Date: Thu, 17 Nov 2022 16:34:14 -0800 Message-Id: <20221118003410.never.653-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1103; h=from:subject:message-id; bh=Q3A301qUeRB8tq7dkiRpjGQmp7qcdEcbj6KnmtW0Kwk=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBjdtMFIHEE/2aFsG+0+1k2j6trtVeqZg6//sNcJ9PZ qpTOZmaJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCY3bTBQAKCRCJcvTf3G3AJmxND/ 4nU1/hNVNbDf3WDg7BJbbkga3ERM+KhF9FnAQVu8KD6VPUt+W3bNr9NimO5ebcKzxJIpAWnFFquFte arvoVm5AdjVA997ZUKDrwC3EfEOyszPX6WaRYz6/CTXy7OFJiJKAgdqiz0rM0Jb/VpEyNJFTQNVyxV wMroI6NjViv6G3EUD1FiAkTEyQvtGBfX4ps6mqXa+VFwFlzH56Pqq95o3+RDaekupGblAKIBILa3px 8qchKhd+rbNaM/5Q+krz/xGgEM3pADGVa1Gc7LcICT0swoJlyfl1/5QZCPntj70a0cp50YlpWLkL48 45rCEUBDdCNJ4zVQ8RGTTK7xxjzkZU/6LtVntk/6bvsujeJDTaexOWPF3/qYjPI2jUerZlakCMj4rf Tgd33LBDRv/KHbPWibXCHmOHgWJwjfNWmVbwxsDs+Yksj/1JiO7OX0fLNJpZn9GbNjmBjfKyz4MjzP c5GmSJFRqJPwPubdfziNeJUTx6BpruAG2rBrcZWSPMAW+hvDOXwvycOVf6FcXrKbuxWDN0o4vHAS4B PtDF7gVEHcr/1T1ve6JOKyFcoF5KHZnCDfMJa7DhDf/f6beMa0KDPvcVSZKFe40c//VyjBP88R8yis ZoZVUu2RUXJONdTela0ORVr6/2I+UkBiTe7Sdd4SleuMafvG7eTx4ES95sfA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1668731657; a=rsa-sha256; cv=none; b=Bjl6QNr28cT4jHcWMIMA/aAPtAvHwWicAdMLanE/f7g2gBQxHBzBrBd2ZwLvyyrcWAK1X1 Pn3FlRGniMmiokZhwDW9ZDt8HNAGbGyAH7qCV5UBiedvHiC99EXZCGYU36vZjZAE996B0n 9lzfgp1nI0gKH5gk+YTf1riRE34oLNs= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=hBAITYak; spf=pass (imf11.hostedemail.com: domain of keescook@chromium.org designates 209.85.216.43 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1668731657; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:references:dkim-signature; bh=zfKoIXcdSbSCG4X8dhvdkumwWP5cdUHpW/BAvV90utQ=; b=XMmGuqiocdh0ZXYw9IKNsDLTU6gmc5RJvWXkPu+y8zi+dRAzkRrmP8hW2yK+N2C/SJJOKn OE3mp39Q54niz7Itnb+krqxRBUtbY4+PwfZjZGm76q4BSNtk1orC68ibZXpAr2BlFR7suh jUyM6oXSsgSkFf9Uioa92zBNf4ngQZA= X-Stat-Signature: xaz1s1c7urmz5pbq6cihz8dwujw559hx X-Rspamd-Queue-Id: C539140002 Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=hBAITYak; spf=pass (imf11.hostedemail.com: domain of keescook@chromium.org designates 209.85.216.43 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org X-Rspamd-Server: rspam04 X-Rspam-User: X-HE-Tag: 1668731657-536976 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: It does not appear that FOLL_FORCE should be needed for setting up the stack pages. They are allocated using the nascent brpm->vma, which was newly created with VM_STACK_FLAGS, which an arch can override, but they all appear to include VM_WRITE | VM_MAYWRITE. Remove FOLL_FORCE. Cc: Eric Biederman Cc: David Hildenbrand Cc: Linus Torvalds Cc: Alexander Viro Cc: linux-fsdevel@vger.kernel.org Cc: linux-mm@kvack.org Link: https://lore.kernel.org/lkml/202211171439.CDE720EAD@keescook/ Signed-off-by: Kees Cook --- fs/exec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/exec.c b/fs/exec.c index 9585bc1bc970..870a707b5d3b 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -200,7 +200,7 @@ static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, { struct page *page; int ret; - unsigned int gup_flags = FOLL_FORCE; + unsigned int gup_flags = 0; #ifdef CONFIG_STACK_GROWSUP if (write) { -- 2.34.1