netdev - [PATCH RFC v2 4/6] coredump: show supported coredump modes

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Message-Id: <20250502-work-coredump-socket-v2-4-43259042ffc7@kernel.org>
Date: Fri, 02 May 2025 14:42:35 +0200
From: Christian Brauner <brauner@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>, 
 Kuniyuki Iwashima <kuniyu@...zon.com>, Oleg Nesterov <oleg@...hat.com>, 
 linux-fsdevel@...r.kernel.org, Jann Horn <jannh@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>, 
 Alexander Viro <viro@...iv.linux.org.uk>, 
 Daan De Meyer <daan.j.demeyer@...il.com>, 
 David Rheinsberg <david@...dahead.eu>, Jakub Kicinski <kuba@...nel.org>, 
 Jan Kara <jack@...e.cz>, Lennart Poettering <lennart@...ttering.net>, 
 Luca Boccassi <bluca@...ian.org>, Mike Yuan <me@...dnzj.com>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>, 
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
 Christian Brauner <brauner@...nel.org>
Subject: [PATCH RFC v2 4/6] coredump: show supported coredump modes

Allow userspace to discover what coredump modes are supported.

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 fs/coredump.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/fs/coredump.c b/fs/coredump.c
index 9a6cba233db9..1c7428c23878 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -1217,6 +1217,13 @@ 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[] = {
+#ifdef CONFIG_UNIX
+	"file\npipe\nunix"
+#else
+	"file\npipe"
+#endif
+};

 static const struct ctl_table coredump_sysctls[] = {
 	{
@@ -1260,6 +1267,13 @@ 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