| Message ID | 20180417004918.29213-2-longli@linuxonhyperv.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
> -----Original Message----- > From: linux-rdma-owner@vger.kernel.org [mailto:linux-rdma- > owner@vger.kernel.org] On Behalf Of Long Li > Sent: Monday, April 16, 2018 7:49 PM > To: Steve French <sfrench@samba.org>; linux-cifs@vger.kernel.org; samba- > technical@lists.samba.org; linux-kernel@vger.kernel.org; linux- > rdma@vger.kernel.org; stable@vger.kernel.org > Cc: longli <longli@microsoft.com> > Subject: [PATCH 2/6] cifs: Allocate validate negoation request through kmalloc > > From: Long Li <longli@microsoft.com> > > The data buffer allocated on the stack can't be DMA'ed, and hence can't send > through RDMA via SMB Direct. > > Fix this by allocating the request on the heap in smb3_validate_negotiate. > Please provide Fixes ("12-letters commit id") "commit string" which introduced this issue and it is getting fixed here, so that other can apply this fix to older versions. > Signed-off-by: Long Li <longli@microsoft.com> > --- > fs/cifs/smb2pdu.c | 38 ++++++++++++++++++++++---------------- > 1 file changed, 22 insertions(+), 16 deletions(-) > > diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 0f044c4..abbefe2 > 100644 > --- a/fs/cifs/smb2pdu.c > +++ b/fs/cifs/smb2pdu.c > @@ -730,7 +730,7 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses > *ses) int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon > *tcon) { > int rc = 0; > - struct validate_negotiate_info_req vneg_inbuf; > + struct validate_negotiate_info_req *pneg_inbuf; [..] > rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, > FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */, > - (char *)&vneg_inbuf, sizeof(struct > validate_negotiate_info_req), > + (char *)pneg_inbuf, sizeof(struct validate_negotiate_info_req), > (char **)&pneg_rsp, &rsplen); > > if (rc != 0) { > cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc); > + kfree(pneg_inbuf); > return -EIO; Instead of duplicating code here, please jump to err_rsp_free label. Kfree() takes care to not panic for NULL pointer. Or for clarity define new label. > } > > @@ -838,12 +842,14 @@ int smb3_validate_negotiate(const unsigned int xid, > struct cifs_tcon *tcon) > > /* validate negotiate successful */ > cifs_dbg(FYI, "validate negotiate info successful\n"); > + kfree(pneg_inbuf); > kfree(pneg_rsp); > return 0; > > vneg_out: > cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n"); > err_rsp_free: > + kfree(pneg_inbuf); > kfree(pneg_rsp); > return -EIO; > } > -- > 2.7.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body > of a message to majordomo@vger.kernel.org More majordomo info at > http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Mon, Apr 16, 2018 at 05:49:14PM -0700, Long Li wrote: > From: Long Li <longli@microsoft.com> > > The data buffer allocated on the stack can't be DMA'ed, and hence can't send > through RDMA via SMB Direct. > > Fix this by allocating the request on the heap in smb3_validate_negotiate. > > Signed-off-by: Long Li <longli@microsoft.com> > --- > fs/cifs/smb2pdu.c | 38 ++++++++++++++++++++++---------------- > 1 file changed, 22 insertions(+), 16 deletions(-) > > diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c > index 0f044c4..abbefe2 100644 > --- a/fs/cifs/smb2pdu.c > +++ b/fs/cifs/smb2pdu.c > @@ -730,7 +730,7 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses) > int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) > { > int rc = 0; > - struct validate_negotiate_info_req vneg_inbuf; > + struct validate_negotiate_info_req *pneg_inbuf; > struct validate_negotiate_info_rsp *pneg_rsp = NULL; > u32 rsplen; > u32 inbuflen; /* max of 4 dialects */ > @@ -741,6 +741,9 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) > if (tcon->ses->server->rdma) > return 0; > #endif > + pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_KERNEL); > + if (!pneg_inbuf) > + return -ENOMEM; > > /* In SMB3.11 preauth integrity supersedes validate negotiate */ > if (tcon->ses->server->dialect == SMB311_PROT_ID) > @@ -764,52 +767,53 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) > if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL) > cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n"); > > - vneg_inbuf.Capabilities = > + pneg_inbuf->Capabilities = > cpu_to_le32(tcon->ses->server->vals->req_capabilities); > - memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid, > + memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid, > SMB2_CLIENT_GUID_SIZE); > > if (tcon->ses->sign) > - vneg_inbuf.SecurityMode = > + pneg_inbuf->SecurityMode = > cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); > else if (global_secflags & CIFSSEC_MAY_SIGN) > - vneg_inbuf.SecurityMode = > + pneg_inbuf->SecurityMode = > cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); > else > - vneg_inbuf.SecurityMode = 0; > + pneg_inbuf->SecurityMode = 0; > > > if (strcmp(tcon->ses->server->vals->version_string, > SMB3ANY_VERSION_STRING) == 0) { > - vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID); > - vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID); > - vneg_inbuf.DialectCount = cpu_to_le16(2); > + pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); > + pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); > + pneg_inbuf->DialectCount = cpu_to_le16(2); > /* structure is big enough for 3 dialects, sending only 2 */ > inbuflen = sizeof(struct validate_negotiate_info_req) - 2; > } else if (strcmp(tcon->ses->server->vals->version_string, > SMBDEFAULT_VERSION_STRING) == 0) { > - vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID); > - vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID); > - vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID); > - vneg_inbuf.DialectCount = cpu_to_le16(3); > + pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); > + pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); > + pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); > + pneg_inbuf->DialectCount = cpu_to_le16(3); > /* structure is big enough for 3 dialects */ > inbuflen = sizeof(struct validate_negotiate_info_req); > } else { > /* otherwise specific dialect was requested */ > - vneg_inbuf.Dialects[0] = > + pneg_inbuf->Dialects[0] = > cpu_to_le16(tcon->ses->server->vals->protocol_id); > - vneg_inbuf.DialectCount = cpu_to_le16(1); > + pneg_inbuf->DialectCount = cpu_to_le16(1); > /* structure is big enough for 3 dialects, sending only 1 */ > inbuflen = sizeof(struct validate_negotiate_info_req) - 4; > } > > rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, > FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */, > - (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req), > + (char *)pneg_inbuf, sizeof(struct validate_negotiate_info_req), > (char **)&pneg_rsp, &rsplen); > > if (rc != 0) { > cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc); > + kfree(pneg_inbuf); > return -EIO; > } > > @@ -838,12 +842,14 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) > > /* validate negotiate successful */ > cifs_dbg(FYI, "validate negotiate info successful\n"); > + kfree(pneg_inbuf); > kfree(pneg_rsp); > return 0; > > vneg_out: > cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n"); > err_rsp_free: > + kfree(pneg_inbuf); > kfree(pneg_rsp); > return -EIO; > } > -- > 2.7.4 <formletter> This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly. </formletter> -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
> Subject: RE: [PATCH 2/6] cifs: Allocate validate negoation request through > kmalloc > > > > > -----Original Message----- > > From: linux-rdma-owner@vger.kernel.org [mailto:linux-rdma- > > owner@vger.kernel.org] On Behalf Of Long Li > > Sent: Monday, April 16, 2018 7:49 PM > > To: Steve French <sfrench@samba.org>; linux-cifs@vger.kernel.org; > > samba- technical@lists.samba.org; linux-kernel@vger.kernel.org; linux- > > rdma@vger.kernel.org; stable@vger.kernel.org > > Cc: longli <longli@microsoft.com> > > Subject: [PATCH 2/6] cifs: Allocate validate negoation request through > > kmalloc > > > > From: Long Li <longli@microsoft.com> > > > > The data buffer allocated on the stack can't be DMA'ed, and hence > > can't send through RDMA via SMB Direct. > > > > Fix this by allocating the request on the heap in smb3_validate_negotiate. > > > Please provide Fixes ("12-letters commit id") "commit string" which > introduced this issue and it is getting fixed here, so that other can apply this > fix to older versions. Will do. > > > Signed-off-by: Long Li <longli@microsoft.com> > > --- > > fs/cifs/smb2pdu.c | 38 ++++++++++++++++++++++---------------- > > 1 file changed, 22 insertions(+), 16 deletions(-) > > > > diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index > > 0f044c4..abbefe2 > > 100644 > > --- a/fs/cifs/smb2pdu.c > > +++ b/fs/cifs/smb2pdu.c > > @@ -730,7 +730,7 @@ SMB2_negotiate(const unsigned int xid, struct > > cifs_ses > > *ses) int smb3_validate_negotiate(const unsigned int xid, struct > > cifs_tcon > > *tcon) { > > int rc = 0; > > - struct validate_negotiate_info_req vneg_inbuf; > > + struct validate_negotiate_info_req *pneg_inbuf; > [..] > > > rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, > > FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */, > > - (char *)&vneg_inbuf, sizeof(struct > > validate_negotiate_info_req), > > + (char *)pneg_inbuf, sizeof(struct > validate_negotiate_info_req), > > (char **)&pneg_rsp, &rsplen); > > > > if (rc != 0) { > > cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc); > > + kfree(pneg_inbuf); > > return -EIO; > Instead of duplicating code here, please jump to err_rsp_free label. Kfree() > takes care to not panic for NULL pointer. > Or for clarity define new label. I will fix this. > > > } > > > > @@ -838,12 +842,14 @@ int smb3_validate_negotiate(const unsigned int > > xid, struct cifs_tcon *tcon) > > > > /* validate negotiate successful */ > > cifs_dbg(FYI, "validate negotiate info successful\n"); > > + kfree(pneg_inbuf); > > kfree(pneg_rsp); > > return 0; > > > > vneg_out: > > cifs_dbg(VFS, "protocol revalidation - security settings > > mismatch\n"); > > err_rsp_free: > > + kfree(pneg_inbuf); > > kfree(pneg_rsp); > > return -EIO; > > } > > -- > > 2.7.4 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-rdma" > > in the body of a message to majordomo@vger.kernel.org More > majordomo > > info at > > > https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fvger.k > > ernel.org%2Fmajordomo- > info.html&data=02%7C01%7Clongli%40microsoft.com% > > > 7Cc8c0b791819745b7403408d5a417d9d2%7C72f988bf86f141af91ab2d7cd011d > b47% > > > 7C1%7C0%7C636595344704783010&sdata=99vU6g%2FE5b8TG8Dn2MngmNw > pP5MghgdoV > > hBf0sak%2B0w%3D&reserved=0 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 0f044c4..abbefe2 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -730,7 +730,7 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses) int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) { int rc = 0; - struct validate_negotiate_info_req vneg_inbuf; + struct validate_negotiate_info_req *pneg_inbuf; struct validate_negotiate_info_rsp *pneg_rsp = NULL; u32 rsplen; u32 inbuflen; /* max of 4 dialects */ @@ -741,6 +741,9 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) if (tcon->ses->server->rdma) return 0; #endif + pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_KERNEL); + if (!pneg_inbuf) + return -ENOMEM; /* In SMB3.11 preauth integrity supersedes validate negotiate */ if (tcon->ses->server->dialect == SMB311_PROT_ID) @@ -764,52 +767,53 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL) cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n"); - vneg_inbuf.Capabilities = + pneg_inbuf->Capabilities = cpu_to_le32(tcon->ses->server->vals->req_capabilities); - memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid, + memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid, SMB2_CLIENT_GUID_SIZE); if (tcon->ses->sign) - vneg_inbuf.SecurityMode = + pneg_inbuf->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); else if (global_secflags & CIFSSEC_MAY_SIGN) - vneg_inbuf.SecurityMode = + pneg_inbuf->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); else - vneg_inbuf.SecurityMode = 0; + pneg_inbuf->SecurityMode = 0; if (strcmp(tcon->ses->server->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { - vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID); - vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID); - vneg_inbuf.DialectCount = cpu_to_le16(2); + pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); + pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); + pneg_inbuf->DialectCount = cpu_to_le16(2); /* structure is big enough for 3 dialects, sending only 2 */ inbuflen = sizeof(struct validate_negotiate_info_req) - 2; } else if (strcmp(tcon->ses->server->vals->version_string, SMBDEFAULT_VERSION_STRING) == 0) { - vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID); - vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID); - vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID); - vneg_inbuf.DialectCount = cpu_to_le16(3); + pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); + pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); + pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); + pneg_inbuf->DialectCount = cpu_to_le16(3); /* structure is big enough for 3 dialects */ inbuflen = sizeof(struct validate_negotiate_info_req); } else { /* otherwise specific dialect was requested */ - vneg_inbuf.Dialects[0] = + pneg_inbuf->Dialects[0] = cpu_to_le16(tcon->ses->server->vals->protocol_id); - vneg_inbuf.DialectCount = cpu_to_le16(1); + pneg_inbuf->DialectCount = cpu_to_le16(1); /* structure is big enough for 3 dialects, sending only 1 */ inbuflen = sizeof(struct validate_negotiate_info_req) - 4; } rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */, - (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req), + (char *)pneg_inbuf, sizeof(struct validate_negotiate_info_req), (char **)&pneg_rsp, &rsplen); if (rc != 0) { cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc); + kfree(pneg_inbuf); return -EIO; } @@ -838,12 +842,14 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) /* validate negotiate successful */ cifs_dbg(FYI, "validate negotiate info successful\n"); + kfree(pneg_inbuf); kfree(pneg_rsp); return 0; vneg_out: cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n"); err_rsp_free: + kfree(pneg_inbuf); kfree(pneg_rsp); return -EIO; }