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From: Eric Biggers <ebiggers@kernel.org>
To: linux-mtd@lists.infradead.org, Richard Weinberger <richard@nod.at>
Cc: linux-fscrypt@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	stable@vger.kernel.org
Subject: [PATCH 1/2] ubifs: fix FS_IOC_SETFLAGS unexpectedly clearing encrypt flag
Date: Mon,  9 Dec 2019 14:23:24 -0800	[thread overview]
Message-ID: <20191209222325.95656-2-ebiggers@kernel.org> (raw)
In-Reply-To: <20191209222325.95656-1-ebiggers@kernel.org>

From: Eric Biggers <ebiggers@google.com>

UBIFS's implementation of FS_IOC_SETFLAGS fails to preserve existing
inode flags that aren't settable by FS_IOC_SETFLAGS, namely the encrypt
flag.  This causes the encrypt flag to be unexpectedly cleared.

Fix it by preserving existing unsettable flags, like ext4 and f2fs do.

Test case with kvm-xfstests shell:

    FSTYP=ubifs KEYCTL_PROG=keyctl
    . fs/ubifs/config
    . ~/xfstests/common/encrypt
    dev=$(__blkdev_to_ubi_volume /dev/vdc)
    ubiupdatevol -t $dev
    mount $dev /mnt -t ubifs
    k=$(_generate_session_encryption_key)
    mkdir /mnt/edir
    xfs_io -c "set_encpolicy $k" /mnt/edir
    echo contents > /mnt/edir/file
    chattr +i /mnt/edir/file
    chattr -i /mnt/edir/file

With the bug, the following errors occur on the last command:

    [   18.081559] fscrypt (ubifs, inode 67): Inconsistent encryption context (parent directory: 65)
    chattr: Operation not permitted while reading flags on /mnt/edir/file

Fixes: d475a507457b ("ubifs: Add skeleton for fscrypto")
Cc: <stable@vger.kernel.org> # v4.10+
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ubifs/ioctl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c
index 5dc5abca11c70..eeb1be2598881 100644
--- a/fs/ubifs/ioctl.c
+++ b/fs/ubifs/ioctl.c
@@ -113,7 +113,8 @@ static int setflags(struct inode *inode, int flags)
 	if (err)
 		goto out_unlock;
 
-	ui->flags = ioctl2ubifs(flags);
+	ui->flags &= ~ioctl2ubifs(UBIFS_SUPPORTED_IOCTL_FLAGS);
+	ui->flags |= ioctl2ubifs(flags);
 	ubifs_set_inode_flags(inode);
 	inode->i_ctime = current_time(inode);
 	release = ui->dirty;
-- 
2.24.0.393.g34dc348eaf-goog


WARNING: multiple messages have this Message-ID (diff)
From: Eric Biggers <ebiggers@kernel.org>
To: linux-mtd@lists.infradead.org, Richard Weinberger <richard@nod.at>
Cc: linux-fsdevel@vger.kernel.org, linux-fscrypt@vger.kernel.org,
	stable@vger.kernel.org
Subject: [PATCH 1/2] ubifs: fix FS_IOC_SETFLAGS unexpectedly clearing encrypt flag
Date: Mon,  9 Dec 2019 14:23:24 -0800	[thread overview]
Message-ID: <20191209222325.95656-2-ebiggers@kernel.org> (raw)
In-Reply-To: <20191209222325.95656-1-ebiggers@kernel.org>

From: Eric Biggers <ebiggers@google.com>

UBIFS's implementation of FS_IOC_SETFLAGS fails to preserve existing
inode flags that aren't settable by FS_IOC_SETFLAGS, namely the encrypt
flag.  This causes the encrypt flag to be unexpectedly cleared.

Fix it by preserving existing unsettable flags, like ext4 and f2fs do.

Test case with kvm-xfstests shell:

    FSTYP=ubifs KEYCTL_PROG=keyctl
    . fs/ubifs/config
    . ~/xfstests/common/encrypt
    dev=$(__blkdev_to_ubi_volume /dev/vdc)
    ubiupdatevol -t $dev
    mount $dev /mnt -t ubifs
    k=$(_generate_session_encryption_key)
    mkdir /mnt/edir
    xfs_io -c "set_encpolicy $k" /mnt/edir
    echo contents > /mnt/edir/file
    chattr +i /mnt/edir/file
    chattr -i /mnt/edir/file

With the bug, the following errors occur on the last command:

    [   18.081559] fscrypt (ubifs, inode 67): Inconsistent encryption context (parent directory: 65)
    chattr: Operation not permitted while reading flags on /mnt/edir/file

Fixes: d475a507457b ("ubifs: Add skeleton for fscrypto")
Cc: <stable@vger.kernel.org> # v4.10+
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ubifs/ioctl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c
index 5dc5abca11c70..eeb1be2598881 100644
--- a/fs/ubifs/ioctl.c
+++ b/fs/ubifs/ioctl.c
@@ -113,7 +113,8 @@ static int setflags(struct inode *inode, int flags)
 	if (err)
 		goto out_unlock;
 
-	ui->flags = ioctl2ubifs(flags);
+	ui->flags &= ~ioctl2ubifs(UBIFS_SUPPORTED_IOCTL_FLAGS);
+	ui->flags |= ioctl2ubifs(flags);
 	ubifs_set_inode_flags(inode);
 	inode->i_ctime = current_time(inode);
 	release = ui->dirty;
-- 
2.24.0.393.g34dc348eaf-goog


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http://lists.infradead.org/mailman/listinfo/linux-mtd/

  reply	other threads:[~2019-12-09 22:24 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-09 22:23 [PATCH 0/2] ubifs: fixes for FS_IOC_GETFLAGS and FS_IOC_SETFLAGS Eric Biggers
2019-12-09 22:23 ` Eric Biggers
2019-12-09 22:23 ` Eric Biggers [this message]
2019-12-09 22:23   ` [PATCH 1/2] ubifs: fix FS_IOC_SETFLAGS unexpectedly clearing encrypt flag Eric Biggers
2019-12-16 15:06   ` Sasha Levin
2019-12-17 18:46     ` Eric Biggers
2019-12-17 18:46       ` Eric Biggers
2019-12-09 22:23 ` [PATCH 2/2] ubifs: add support for FS_ENCRYPT_FL Eric Biggers
2019-12-09 22:23   ` Eric Biggers
2020-01-03 17:08 ` [PATCH 0/2] ubifs: fixes for FS_IOC_GETFLAGS and FS_IOC_SETFLAGS Eric Biggers
2020-01-03 17:08   ` Eric Biggers
2020-01-14 22:00 ` Eric Biggers
2020-01-14 22:00   ` Eric Biggers
2020-01-14 22:03   ` Richard Weinberger
2020-01-14 22:03     ` Richard Weinberger
2020-01-16 23:32     ` Richard Weinberger
2020-01-16 23:32       ` Richard Weinberger

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