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a=Yupwre4RP9_Eg_Bd0iYG:22 a=5yU3S35YU4bGjq-dph-N:22 a=Bho9c0fBagfJEIQBS7DQ:22 cc=ntf awl=host:12102 X-Proofpoint-GUID: KUK-FL_XHi0wGsIlxNn0NbigGJqk3QOY X-Proofpoint-Spam-Info: AW1haW4tMjYwODI5MDE3NCBTYWx0ZWRfX2iB88Cgaw/02 eq2iwBvPiAU40yOXGimTxJ0T9spq8fd+DO3VrTWA9xW/xt/R0R/L2m2dkoRZuxkcFXu/MeCyUvQ xwAiZDu+CM2IAWCOTGn/tLa+ERgZZjtiYwUCcT959QtDJ6gy+8rS Hi Greg/Sasha, On 20/08/26 8:25 pm, Greg Kroah-Hartman wrote: > 6.12-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: ChenXiaoSong > > [ Upstream commit 3b9c30eb8f5aaad4a54cdfa470b74c0467cc71e8 ] > > Since the RFC1002 header has been removed from `struct smb_hdr`, > the minimum SMB1 PDU size should be updated as well. > > Fixes: 83bfbd0bb902 ("cifs: Remove the RFC1002 header from smb_hdr") > Suggested-by: David Howells > Suggested-by: Namjae Jeon > Signed-off-by: ChenXiaoSong > Reviewed-by: David Howells > Acked-by: Namjae Jeon > Signed-off-by: Steve French > Stable-dep-of: cfc0b8e5080a ("ksmbd: validate minimum PDU size for transform requests") > Signed-off-by: Sasha Levin > Signed-off-by: Greg Kroah-Hartman I ran an AI-assisted backport review and then checked 465e7e8a68af ("smb/server: fix minimum SMB1 PDU size") against the upstream and 6.12.y receive paths. I do not think this patch belongs in 6.12.y. Upstream has an RFC1002-free struct smb_hdr which is 33 bytes, so: #define SMB1_MIN_SUPPORTED_PDU_SIZE \ (sizeof(struct smb_hdr) + 2) correctly includes the two-byte ByteCount and produces a 35-byte minimum. In 6.12.y, struct smb_hdr still begins with the four-byte smb_buf_length, while the receive path does this: pdu_size = get_rfc1002_len(hdr_buf); size = t->ops->read(t, conn->request_buf + 4, pdu_size, 2); Here sizeof(struct smb_hdr) is 37, but pdu_size excludes those four transport bytes. The previous 6.12.y check was already large enough to avoid upstream's too-short 33-byte bound. Copying upstream's +2 instead raises the branch's bound from 37 to 39 and rejects records that previously reached SMB1 validation. The later transform-request fix uses separate SMB2 and transform bounds, so it does not require this SMB1 arithmetic change. Since the upstream bug is absent with the 6.12.y header layout, I would suggest dropping 465e7e8a68af from 6.12.y. Now that we have merged it, we need to think about other ways of dealing with this. It is probably a functional issue, still looks like something to be fixed. thanks, Harshit > --- > fs/smb/server/connection.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > --- a/fs/smb/server/connection.c > +++ b/fs/smb/server/connection.c > @@ -376,7 +376,8 @@ bool ksmbd_conn_alive(struct ksmbd_conn > return true; > } > > -#define SMB1_MIN_SUPPORTED_HEADER_SIZE (sizeof(struct smb_hdr)) > +/* "+2" for BCC field (ByteCount, 2 bytes) */ > +#define SMB1_MIN_SUPPORTED_PDU_SIZE (sizeof(struct smb_hdr) + 2) > #define SMB2_MIN_SUPPORTED_HEADER_SIZE (sizeof(struct smb2_hdr) + 4) > > /** > @@ -444,7 +445,7 @@ recheck: > if (pdu_size > MAX_STREAM_PROT_LEN) > break; > > - if (pdu_size < SMB1_MIN_SUPPORTED_HEADER_SIZE) > + if (pdu_size < SMB1_MIN_SUPPORTED_PDU_SIZE) > break; > > /* 4 for rfc1002 length field */ > > >