linux-kernel - [PATCH AUTOSEL 5.15 3/8] platform/chrome: cros_ec

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Date: Mon, 15 Jan 2024 19:14:31 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Avadhut Naik <Avadhut.Naik@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tony Luck <tony.luck@...el.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	bleung@...omium.org,
	tzungbi@...nel.org,
	chrome-platform@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.15 3/8] platform/chrome: cros_ec_debugfs: Fix permissions for panicinfo

From: Avadhut Naik <Avadhut.Naik@....com>

[ Upstream commit 0706526ec7704dcd046239078ac175d11a88a95e ]

The debugfs_create_blob() function has been used to create read-only binary
blobs in debugfs. The function filters out permissions, other than S_IRUSR,
S_IRGRP and S_IROTH, provided while creating the blobs.

The very behavior though is being changed through previous patch in the
series (fs: debugfs: Add write functionality to debugfs blobs) which makes
the binary blobs writable by owners. Thus, all permissions provided while
creating the blobs, except S_IRUSR,S_IWUSR, S_IRGRP, S_IROTH, will be
filtered by debugfs_create_blob().

As such, rectify the permissions of panicinfo file since the S_IFREG flag
was anyways being filtered out by debugfs_create_blob(). Moreover, the
very flag will always be set be set for the panicinfo file through
__debugfs_create_file().

Signed-off-by: Avadhut Naik <Avadhut.Naik@....com>
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/chrome/cros_ec_debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index 0dbceee87a4b..e2940d3b69c3 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -427,7 +427,7 @@ static int cros_ec_create_panicinfo(struct cros_ec_debugfs *debug_info)
 	debug_info->panicinfo_blob.data = msg->data;
 	debug_info->panicinfo_blob.size = ret;

-	debugfs_create_blob("panicinfo", S_IFREG | 0444, debug_info->dir,
+	debugfs_create_blob("panicinfo", 0444, debug_info->dir,
 			    &debug_info->panicinfo_blob);

 	return 0;
-- 
2.43.0