cifs: dynamic allocation of ntlmssp blob

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commit b8da344b74 upstream.

In sess_auth_rawntlmssp_authenticate(), the ntlmssp blob is allocated
statically and its size is an "empirical" 5*sizeof(struct
_AUTHENTICATE_MESSAGE) (320B on x86_64). I don't know where this value
comes from or if it was ever appropriate, but it is currently
insufficient: the user and domain name in UTF16 could take 1kB by
themselves. Because of that, build_ntlmssp_auth_blob() might corrupt
memory (out-of-bounds write). The size of ntlmssp_blob in
SMB2_sess_setup() is too small too (sizeof(struct _NEGOTIATE_MESSAGE)
+ 500).

This patch allocates the blob dynamically in
build_ntlmssp_auth_blob().

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
[bwh: Backported to 3.16: adjust context, indentation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

This commit is contained in:

Jerome Marchand 2016-05-26 11:52:25 +02:00 • committed by Ben Hutchings

parent 30622d3dbf

commit 44b522de8d

3 changed files with 45 additions and 44 deletions

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2

fs/cifs/ntlmssp.h

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77

fs/cifs/sess.c

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10

fs/cifs/smb2pdu.c

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