ksmbd: don't allow O_TRUNC open on read-only share

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commit d592a9158a upstream.

When file is changed using notepad on read-only share(read_only = yes in
ksmbd.conf), There is a problem where existing data is truncated.
notepad in windows try to O_TRUNC open(FILE_OVERWRITE_IF) and all data
in file is truncated. This patch don't allow  O_TRUNC open on read-only
share and add KSMBD_TREE_CONN_FLAG_WRITABLE check in smb2_set_info().

Cc: stable@vger.kernel.org
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Namjae Jeon 2024-01-07 21:24:07 +09:00 • committed by Greg Kroah-Hartman

parent c24fc060ab

commit 09d84f37f8

1 changed files with 9 additions and 14 deletions

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fs/smb/server/smb2pdu.c

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