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Resent-From: Ludovic =?utf-8?q?Court=C3=A8s?= Original-Sender: "Debbugs-submit" Resent-CC: guix-patches@gnu.org Resent-Date: Sun, 23 Mar 2025 14:26:15 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 75810 X-GNU-PR-Package: guix-patches X-GNU-PR-Keywords: patch To: 75810@debbugs.gnu.org Cc: Ludovic =?utf-8?q?Court=C3=A8s?= , Reepca Russelstein Received: via spool by 75810-submit@debbugs.gnu.org id=B75810.174273997221292 (code B ref 75810); Sun, 23 Mar 2025 14:26:15 +0000 Received: (at 75810) by debbugs.gnu.org; 23 Mar 2025 14:26:12 +0000 Received: from localhost ([127.0.0.1]:51883 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1twMHC-0005X3-34 for submit@debbugs.gnu.org; Sun, 23 Mar 2025 10:26:11 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43748) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1twMGj-0005QV-LY for 75810@debbugs.gnu.org; Sun, 23 Mar 2025 10:25:44 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1twMGd-0005SB-S2; Sun, 23 Mar 2025 10:25:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-Version:References:In-Reply-To:Date:Subject:To: From; bh=ozQM+lYqSSPDiTg6Dp/w4oPIGKDs4CrGaOeKp99rZWg=; b=hCz08O0HEKDKyyBjWhiP DgNzFpyC/QunHL+e3/QC6BxM6DJGQYK7MhX/L7iCkZN1zROc15cLLjLkWHhjxVUYDFy7yrph3LBgA +Pprb5QcMI4C7+3FEbQtjSt02kA2cOZACubBCUYdwjax8RPgTXvmCvFTaYaKD7Nnq3nEwi6cK9TyC epO1Q3pEFc8ZNr8HmspkkYPnhy/ZM1oYq1qtSg96PDccZ5xplgm8QplLSnlDH2KYQ/dr+NNrdU5Q7 Rw97JX7NBqNAYW6GfV8J81oKEicnIH4e1BWPwANqx3ew2GU8Q718e7gcYy22YPzUqx4uCc1jWS3bb x1WuurwKqCtLGw==; From: Ludovic =?utf-8?q?Court=C3=A8s?= Date: Sun, 23 Mar 2025 15:24:58 +0100 Message-ID: <3fd52374c8bf223596845b5d50a2aaba74120c98.1742739609.git.ludo@gnu.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: References: MIME-Version: 1.0 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: guix-patches@gnu.org List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-patches-bounces+patchwork=mira.cbaines.net@gnu.org Sender: guix-patches-bounces+patchwork=mira.cbaines.net@gnu.org X-getmail-retrieved-from-mailbox: Patches * nix/libstore/build.cc (DerivationGoal::runChild): Remount ‘target’ as read-only. Reported-by: Reepca Russelstein Change-Id: Ib7201bcf4363be566f205d23d17fe2f55d3ad666 --- nix/libstore/build.cc | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc index 193b279b88..3861a1ffd9 100644 --- a/nix/libstore/build.cc +++ b/nix/libstore/build.cc @@ -2107,8 +2107,15 @@ void DerivationGoal::runChild() createDirs(dirOf(target)); writeFile(target, ""); } + + /* Extra flags passed with MS_BIND are ignored, hence the + extra MS_REMOUNT. */ if (mount(source.c_str(), target.c_str(), "", MS_BIND, 0) == -1) throw SysError(format("bind mount from `%1%' to `%2%' failed") % source % target); + if (source.compare(0, settings.nixStore.length(), settings.nixStore) == 0) { + if (mount(source.c_str(), target.c_str(), "", MS_BIND | MS_REMOUNT | MS_RDONLY, 0) == -1) + throw SysError(format("read-only remount of `%1%' failed") % target); + } } /* Bind a new instance of procfs on /proc to reflect our