From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4DE8A239E6C; Fri, 16 May 2025 11:26:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747394778; cv=none; b=R228hxsp7EamMIyUDzLTYB8inImv/IdsaTLaA3TBTLXl98c9hoerie4lXmLqeN3Giz2fkLmP5ks2zoHXtkdBOOcO6zXF/rhrguIlFcxTYpnH19tCpmugPqZ/ES2F9NOO12M50J0umH/7HDL1mRks8KL4XPUOxlNHaDtp3PBb8bw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747394778; c=relaxed/simple; bh=Ii80ZxJgXHUTdBEM8Pc8vb2Z1/i3PEc4YOr90pWXMkI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=FhpeVdH1Kd1L1i+aiH6ZTAnpEMiGnXKI4eLLo+4KDpwOZgfM64XZOfBRbSQqQRfHJxb9o7MaIH5uehYKWEdfvbiLoivj0H1WUGjCiLZxsEwl7NWJBycYxy3AWKxlr4SZEthRuPh7LvQA5/1KRYlsNDyDOA0mv5EeeAmbE9xYcAk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=G+oRi4VG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="G+oRi4VG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 001A7C4CEEB; Fri, 16 May 2025 11:26:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747394777; bh=Ii80ZxJgXHUTdBEM8Pc8vb2Z1/i3PEc4YOr90pWXMkI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=G+oRi4VGSnKZbLkeRauM6bHc9FKkjYD17GUAxoWWJQDc02OlLQU2ssBv3UUEgkmrM yJUV23OLaaVUOyjXhrIT9U7SO0dNA2S3pAAuwNF7zy0JP01vvqyiUUyGWBnqV14Ale 4Cj9Ln7TkSfhvZRZ7QKERWWwwx3O0YqQ7m02FT75FU7Up+uNv4Aup0UtAiG1Qzd2hS BfmN94tnT+RGODuiayiKwM4LjgldINIg+/Q0yR2VGDIrYjLjaimqfVfDaAzqtDc+xj udVF/VhOcadna5gy+q51BGzJFnkotJrj20JpN5o2fDmQUtYXYbn/Xr+TVXdZzSdxty KsEPHJhXVcDkA== From: Christian Brauner Date: Fri, 16 May 2025 13:25:33 +0200 Subject: [PATCH v8 6/9] coredump: show supported coredump modes Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250516-work-coredump-socket-v8-6-664f3caf2516@kernel.org> References: <20250516-work-coredump-socket-v8-0-664f3caf2516@kernel.org> In-Reply-To: <20250516-work-coredump-socket-v8-0-664f3caf2516@kernel.org> To: linux-fsdevel@vger.kernel.org, Jann Horn , Daniel Borkmann , Kuniyuki Iwashima Cc: Eric Dumazet , Oleg Nesterov , "David S. Miller" , Alexander Viro , Daan De Meyer , David Rheinsberg , Jakub Kicinski , Jan Kara , Lennart Poettering , Luca Boccassi , Mike Yuan , Paolo Abeni , Simon Horman , =?utf-8?q?Zbigniew_J=C4=99drzejewski-Szmek?= , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-security-module@vger.kernel.org, Christian Brauner , Alexander Mikhalitsyn X-Mailer: b4 0.15-dev-6f78e X-Developer-Signature: v=1; a=openpgp-sha256; l=1288; i=brauner@kernel.org; h=from:subject:message-id; bh=Ii80ZxJgXHUTdBEM8Pc8vb2Z1/i3PEc4YOr90pWXMkI=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWSoK2yN+6Ms+3TiB72NRS3ngqrfl8YJyMzQvD1bKfpD/ Anho4lfOkpZGMS4GGTFFFkc2k3C5ZbzVGw2ytSAmcPKBDKEgYtTACbyr5jhf7SQ9/bVMdvL2E98 Zb0rG6j7SHX5wzuaWY/65l5j+/n9ADvDP1UZr2zBmr1PP1z6wP5IhuGfZ4yvkXL5oa1z1kWdz7K J4AcA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Allow userspace to discover what coredump modes are supported. Acked-by: Luca Boccassi Reviewed-by: Jann Horn Reviewed-by: Alexander Mikhalitsyn Signed-off-by: Christian Brauner --- fs/coredump.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/fs/coredump.c b/fs/coredump.c index 48064b1d6305..7b9a659683fc 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -1227,6 +1227,12 @@ static int proc_dostring_coredump(const struct ctl_table *table, int write, static const unsigned int core_file_note_size_min = CORE_FILE_NOTE_SIZE_DEFAULT; static const unsigned int core_file_note_size_max = CORE_FILE_NOTE_SIZE_MAX; +static char core_modes[] = { + "file\npipe" +#ifdef CONFIG_UNIX + "\nsocket" +#endif +}; static const struct ctl_table coredump_sysctls[] = { { @@ -1270,6 +1276,13 @@ static const struct ctl_table coredump_sysctls[] = { .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_ONE, }, + { + .procname = "core_modes", + .data = core_modes, + .maxlen = sizeof(core_modes) - 1, + .mode = 0444, + .proc_handler = proc_dostring, + }, }; static int __init init_fs_coredump_sysctls(void) -- 2.47.2