cifs: wrap received signature check in srv_mutex (157c2491) · Commits · 戴 / test

While testing my patchset to fix asynchronous writes, I hit a bunch of signature problems when testing with signing on. The problem seems to be that signature checks on receive can be running at the same time as a process that is sending, or even that multiple receives can be checking signatures at the same time, clobbering the same data structures. While we're at it, clean up the comments over cifs_calculate_signature and add a note that the srv_mutex should be held when calling this function. This patch seems to fix the problems for me, but I'm not clear on whether it's the best approach. If it is, then this should probably go to stable too. Cc: stable@kernel.org Cc: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by:

Jeff Layton <jlayton@redhat.com> Signed-off-by:

Steve French <sfrench@us.ibm.com>

fs/cifs/cifsencrypt.c

+9 −6

Original line number	Diff line number	Diff line
		@@ -30,12 +30,13 @@
		#include <linux/ctype.h>
		#include <linux/random.h>

		/* Calculate and return the CIFS signature based on the mac key and SMB PDU */
		/* the 16 byte signature must be allocated by the caller */
		/* Note we only use the 1st eight bytes */
		/* Note that the smb header signature field on input contains the
		sequence number before this function is called */

		/*
		* Calculate and return the CIFS signature based on the mac key and SMB PDU.
		* The 16 byte signature must be allocated by the caller. Note we only use the
		* 1st eight bytes and that the smb header signature field on input contains
		* the sequence number before this function is called. Also, this function
		* should be called with the server->srv_mutex held.
		*/
		static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
		struct TCP_Server_Info server, char signature)
		{
		@@ -209,8 +210,10 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
		cpu_to_le32(expected_sequence_number);
		cifs_pdu->Signature.Sequence.Reserved = 0;

		mutex_lock(&server->srv_mutex);
		rc = cifs_calculate_signature(cifs_pdu, server,
		what_we_think_sig_should_be);
		mutex_unlock(&server->srv_mutex);

		if (rc)
		return rc;

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