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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: Mon, 17 Mar 2025 17:05:11 +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=B75810.174223105610241 (code B ref 75810); Mon, 17 Mar 2025 17:05:11 +0000 Received: (at 75810) by debbugs.gnu.org; 17 Mar 2025 17:04:16 +0000 Received: from localhost ([127.0.0.1]:60650 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1tuDsr-0002ei-FL for submit@debbugs.gnu.org; Mon, 17 Mar 2025 13:04:15 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34958) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1tuDsd-0002am-4K for 75810@debbugs.gnu.org; Mon, 17 Mar 2025 13:04:02 -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 1tuDsS-00056P-W8; Mon, 17 Mar 2025 13:03:49 -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=ezBIk7WDTVrD0bQGziaO u3xmUfLca4YXEfQwNelHc4W2vfiKYrVep9UgCZ4G1oi54nktgAIpOr1rbk9x4LTkc+g9DToHBzy3T juWnOvovzCqI42yRzZl4f698SqLe0xH/jZRor1PNpMpLXkWowz2YP6hr5UTppjvAc/Eb5YMBdaH0C 2AgkU6jRKwxk5TVl13g//AJ5VzAR2EQwLXJYw8koCLvGvYyqLcQTGDzOzmABLX3+ouVPn9MdATLAq ycJ/XbJBujCmdPe0+PKVzVTMjBQP+497SCxJojz0Lv6THD13Al2zkdt2SBIs4hxNfRxgUD60k5WKp 6S5+9CAYD/CHdg==; From: Ludovic =?utf-8?q?Court=C3=A8s?= Date: Mon, 17 Mar 2025 18:02:48 +0100 Message-ID: <7bd937c5bb4882476092162aaf7d2dcd6080a9e8.1742230219.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