diff options
| author | Ronnie Sahlberg <lsahlber@redhat.com> | 2018-06-12 01:00:58 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-06-15 10:38:08 +0300 |
| commit | c713c8770fa5bfbeaac088cc7b959c7a6ba79f93 (patch) | |
| tree | 76b49e4511ff8b37777552aa150caae3033ce77c /fs/cifs/cifsencrypt.c | |
| parent | d409014e4feeab486fb36b350abfc4c94de8be37 (diff) | |
| download | linux-c713c8770fa5bfbeaac088cc7b959c7a6ba79f93.tar.xz | |
cifs: push rfc1002 generation down the stack
Move the generation of the 4 byte length field down the stack and
generate it immediately before we start writing the data to the socket.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/cifsencrypt.c')
| -rw-r--r-- | fs/cifs/cifsencrypt.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index 937251cc61c0..f23ff848b158 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -37,7 +37,6 @@ #include <crypto/aead.h> int __cifs_calc_signature(struct smb_rqst *rqst, - int start, struct TCP_Server_Info *server, char *signature, struct shash_desc *shash) { @@ -45,16 +44,30 @@ int __cifs_calc_signature(struct smb_rqst *rqst, int rc; struct kvec *iov = rqst->rq_iov; int n_vec = rqst->rq_nvec; + int is_smb2 = server->vals->header_preamble_size == 0; - for (i = start; i < n_vec; i++) { + /* iov[0] is actual data and not the rfc1002 length for SMB2+ */ + if (is_smb2) { + rc = crypto_shash_update(shash, + iov[0].iov_base, iov[0].iov_len); + } else { + if (n_vec < 2 || iov[0].iov_len != 4) + return -EIO; + } + + for (i = 1; i < n_vec; i++) { if (iov[i].iov_len == 0) continue; if (iov[i].iov_base == NULL) { cifs_dbg(VFS, "null iovec entry\n"); return -EIO; } - if (i == 1 && iov[1].iov_len <= 4) - break; /* nothing to sign or corrupt header */ + if (is_smb2) { + if (i == 0 && iov[0].iov_len <= 4) + break; /* nothing to sign or corrupt header */ + } else + if (i == 1 && iov[1].iov_len <= 4) + break; /* nothing to sign or corrupt header */ rc = crypto_shash_update(shash, iov[i].iov_base, iov[i].iov_len); if (rc) { @@ -118,7 +131,7 @@ static int cifs_calc_signature(struct smb_rqst *rqst, return rc; } - return __cifs_calc_signature(rqst, 1, server, signature, + return __cifs_calc_signature(rqst, server, signature, &server->secmech.sdescmd5->shash); } |