linux-ext4 - [PATCH] tune2fs: allow remove VERITY

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Message-Id: <20200624023107.182118-1-gwendal@chromium.org>
Date:   Tue, 23 Jun 2020 19:31:07 -0700
From:   Gwendal Grignou <gwendal@...omium.org>
To:     sarthakkukreti@...omium.org, tytso@....edu, ebiggers@...gle.com
Cc:     linux-ext4@...r.kernel.org, Gwendal Grignou <gwendal@...omium.org>
Subject: [PATCH] tune2fs: allow remove VERITY

Allow verity flag to be removed from the susperblock:
Tests:
- check the signed file is readable by older kernel after flag
is removed. EXT4_VERITY_FL replaces EXT4_EXT_MIGRATE that has been
removed in 2009.
- when a new kernel is reinstalled, check reenabling verity flag
allow signature to be verified (fsverity measure ...).

Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
---
 misc/tune2fs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 314cc0d0..724b8014 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -198,7 +198,8 @@ static __u32 clear_ok_features[3] = {
 		EXT4_FEATURE_RO_COMPAT_QUOTA |
 		EXT4_FEATURE_RO_COMPAT_PROJECT |
 		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM |
-		EXT4_FEATURE_RO_COMPAT_READONLY
+		EXT4_FEATURE_RO_COMPAT_READONLY |
+		EXT4_FEATURE_RO_COMPAT_VERITY
 };
 
 /**
-- 
2.27.0.111.gc72c7da667-goog