From: <gregkh@linuxfoundation.org>
To: ebiggers@google.com, ebiggers@kernel.org,
gregkh@linuxfoundation.org,
linux-f2fs-devel@lists.sourceforge.net,
linux-mtd@lists.infradead.org
Cc: stable-commits@vger.kernel.org
Subject: [f2fs-dev] Patch "ext4: report correct st_size for encrypted symlinks" has been added to the 4.19-stable tree
Date: Mon, 13 Sep 2021 11:33:36 +0200 [thread overview]
Message-ID: <163152561619799@kroah.com> (raw)
In-Reply-To: <20210908215033.1122580-3-ebiggers@kernel.org>
This is a note to let you know that I've just added the patch titled
ext4: report correct st_size for encrypted symlinks
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-report-correct-st_size-for-encrypted-symlinks.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
From foo@baz Mon Sep 13 11:31:12 AM CEST 2021
From: Eric Biggers <ebiggers@kernel.org>
Date: Wed, 8 Sep 2021 14:50:31 -0700
Subject: ext4: report correct st_size for encrypted symlinks
To: stable@vger.kernel.org
Cc: linux-fscrypt@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mtd@lists.infradead.org
Message-ID: <20210908215033.1122580-3-ebiggers@kernel.org>
From: Eric Biggers <ebiggers@google.com>
commit 8c4bca10ceafc43b1ca0a9fab5fa27e13cbce99e upstream.
The stat() family of syscalls report the wrong size for encrypted
symlinks, which has caused breakage in several userspace programs.
Fix this by calling fscrypt_symlink_getattr() after ext4_getattr() for
encrypted symlinks. This function computes the correct size by reading
and decrypting the symlink target (if it's not already cached).
For more details, see the commit which added fscrypt_symlink_getattr().
Fixes: f348c252320b ("ext4 crypto: add symlink encryption")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210702065350.209646-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/ext4/symlink.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -52,10 +52,19 @@ static const char *ext4_encrypted_get_li
return paddr;
}
+static int ext4_encrypted_symlink_getattr(const struct path *path,
+ struct kstat *stat, u32 request_mask,
+ unsigned int query_flags)
+{
+ ext4_getattr(path, stat, request_mask, query_flags);
+
+ return fscrypt_symlink_getattr(path, stat);
+}
+
const struct inode_operations ext4_encrypted_symlink_inode_operations = {
.get_link = ext4_encrypted_get_link,
.setattr = ext4_setattr,
- .getattr = ext4_getattr,
+ .getattr = ext4_encrypted_symlink_getattr,
.listxattr = ext4_listxattr,
};
Patches currently in stable-queue which might be from ebiggers@kernel.org are
queue-4.19/ubifs-report-correct-st_size-for-encrypted-symlinks.patch
queue-4.19/ext4-report-correct-st_size-for-encrypted-symlinks.patch
queue-4.19/fscrypt-add-fscrypt_symlink_getattr-for-computing-st_size.patch
queue-4.19/f2fs-report-correct-st_size-for-encrypted-symlinks.patch
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next prev parent reply other threads:[~2021-09-13 9:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-08 21:50 [f2fs-dev] [PATCH 0/4] backport fscrypt symlink fixes to 4.19 Eric Biggers
2021-09-08 21:50 ` [f2fs-dev] [PATCH 1/4] fscrypt: add fscrypt_symlink_getattr() for computing st_size Eric Biggers
2021-09-13 9:33 ` [f2fs-dev] Patch "fscrypt: add fscrypt_symlink_getattr() for computing st_size" has been added to the 4.19-stable tree gregkh
2021-09-08 21:50 ` [f2fs-dev] [PATCH 2/4] ext4: report correct st_size for encrypted symlinks Eric Biggers
2021-09-13 9:33 ` gregkh [this message]
2021-09-08 21:50 ` [f2fs-dev] [PATCH 3/4] f2fs: " Eric Biggers
2021-09-13 9:33 ` [f2fs-dev] Patch "f2fs: report correct st_size for encrypted symlinks" has been added to the 4.19-stable tree gregkh
2021-09-08 21:50 ` [f2fs-dev] [PATCH 4/4] ubifs: report correct st_size for encrypted symlinks Eric Biggers
2021-09-13 9:33 ` [f2fs-dev] Patch "ubifs: report correct st_size for encrypted symlinks" has been added to the 4.19-stable tree gregkh
2021-09-13 9:33 ` [f2fs-dev] [PATCH 0/4] backport fscrypt symlink fixes to 4.19 Greg KH
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