Linux v3.14-rc6-26-g33807f4
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Josh Boyer
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Path: news.gmane.org!not-for-mail
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From: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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Newsgroups: gmane.linux.kernel.cifs
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Subject: [PATCH] cifs: mask off top byte in get_rfc1002_length()
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Date: Tue, 25 Feb 2014 05:27:17 -0800
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Lines: 31
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Xref: news.gmane.org gmane.linux.kernel.cifs:9419
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel.cifs/9419>
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The 32-bit rfc1002 header field consists of a type byte and then a
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24-bit length field, but get_rfc1002_length doesn't mask off the top
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byte.
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In most cases, it's not a problem since the RFC1002_SESSION_MESSAGE type
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is '\0', but when doing a RFC1002 session establishment, the type is
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non-zero and that throws off the returned length in smb_send_rqst.
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Reported-by: klaus-jjkdzbv0JQgAvxtiuMwx3w@public.gmane.org
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Tested-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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Signed-off-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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---
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fs/cifs/cifsglob.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
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index e7fe49e..45376a4 100644
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--- a/fs/cifs/cifsglob.h
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+++ b/fs/cifs/cifsglob.h
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@@ -506,7 +506,7 @@ struct cifs_mnt_data {
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static inline unsigned int
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get_rfc1002_length(void *buf)
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{
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- return be32_to_cpu(*((__be32 *)buf));
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+ return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
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}
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static inline void
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--
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1.8.5.3
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@ -1,129 +0,0 @@
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Path: news.gmane.org!not-for-mail
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From: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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Newsgroups: gmane.linux.kernel.cifs
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Subject: [PATCH] cifs: sanity check length of data to send before sending
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Date: Fri, 14 Feb 2014 07:21:00 -0500
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel.cifs/9402>
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We had a bug discovered recently where an upper layer function
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(cifs_iovec_write) could pass down a smb_rqst with an invalid amount of
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data in it. The length of the SMB frame would be correct, but the rqst
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struct would cause smb_send_rqst to send nearly 4GB of data.
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This should never be the case. Add some sanity checking to the beginning
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of smb_send_rqst that ensures that the amount of data we're going to
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send agrees with the length in the RFC1002 header. If it doesn't, WARN()
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and return -EIO to the upper layers.
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Signed-off-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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---
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fs/cifs/transport.c | 29 +++++++++++++++++++++++++++++
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1 file changed, 29 insertions(+)
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diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
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index b37570952846..18cd5650a5fc 100644
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--- a/fs/cifs/transport.c
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+++ b/fs/cifs/transport.c
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@@ -270,6 +270,26 @@ cifs_rqst_page_to_kvec(struct smb_rqst *rqst, unsigned int idx,
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iov->iov_len = rqst->rq_pagesz;
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}
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+static unsigned long
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+rqst_len(struct smb_rqst *rqst)
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+{
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+ unsigned int i;
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+ struct kvec *iov = rqst->rq_iov;
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+ unsigned long buflen = 0;
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+
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+ /* total up iov array first */
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+ for (i = 0; i < rqst->rq_nvec; i++)
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+ buflen += iov[i].iov_len;
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+
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+ /* add in the page array if there is one */
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+ if (rqst->rq_npages) {
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+ buflen += rqst->rq_pagesz * (rqst->rq_npages - 1);
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+ buflen += rqst->rq_tailsz;
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+ }
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+
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+ return buflen;
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+}
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+
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static int
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smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst)
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{
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@@ -277,6 +297,7 @@ smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst)
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struct kvec *iov = rqst->rq_iov;
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int n_vec = rqst->rq_nvec;
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unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base);
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+ unsigned long send_length;
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unsigned int i;
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size_t total_len = 0, sent;
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struct socket *ssocket = server->ssocket;
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@@ -285,6 +306,14 @@ smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst)
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if (ssocket == NULL)
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return -ENOTSOCK;
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+ /* sanity check send length */
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+ send_length = rqst_len(rqst);
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+ if (send_length != smb_buf_length + 4) {
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+ WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n",
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+ send_length, smb_buf_length);
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+ return -EIO;
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+ }
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+
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cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length);
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dump_smb(iov[0].iov_base, iov[0].iov_len);
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--
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1.8.5.3
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17
kernel.spec
17
kernel.spec
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@ -61,7 +61,7 @@ Summary: The Linux kernel
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# The rc snapshot level
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%define rcrev 6
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# The git snapshot level
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%define gitrev 1
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%define gitrev 2
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# Set rpm version accordingly
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%define rpmversion 3.%{upstream_sublevel}.0
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%endif
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@ -631,12 +631,6 @@ Patch22000: weird-root-dentry-name-debug.patch
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Patch25047: drm-radeon-Disable-writeback-by-default-on-ppc.patch
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#CVE-2014-0069 rhbz 1064253 1062578
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Patch25201: cifs-sanity-check-length-of-data-to-send-before-sending.patch
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#rhbz 1068862
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Patch25002: cifs-mask-off-top-byte-in-get_rfc1002_length.patch
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#rhbz 1071998
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Patch25034: bug-1071998.patch
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@ -1287,12 +1281,6 @@ ApplyPatch ath9k_rx_dma_stop_check.patch
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ApplyPatch drm-radeon-Disable-writeback-by-default-on-ppc.patch
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#CVE-2014-0069 rhbz 1064253 1062578
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ApplyPatch cifs-sanity-check-length-of-data-to-send-before-sending.patch
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#rhbz 1068862
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ApplyPatch cifs-mask-off-top-byte-in-get_rfc1002_length.patch
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#rhbz 1071998
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ApplyPatch bug-1071998.patch
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@ -2084,6 +2072,9 @@ fi
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# ||----w |
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# || ||
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%changelog
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* Wed Mar 12 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.14.0-0.rc6.git2.1
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- Linux v3.14-rc6-26-g33807f4
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* Wed Mar 12 2014 Peter Robinson <pbrobinson@fedoraproject.org>
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- Add some general missing ARM drivers (mostly sound)
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- ARM config tweaks and cleanups
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2
sources
2
sources
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@ -1,4 +1,4 @@
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0ecbaf65c00374eb4a826c2f9f37606f linux-3.13.tar.xz
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732d1952898b28d5ccc264cad77b0619 perf-man-3.13.tar.gz
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cb06761a64fd9328add06577943e6b37 patch-3.14-rc6.xz
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6d6c3fd42d7ac21414b9602b5ee7e8ae patch-3.14-rc6-git1.xz
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331ea9b7849ae258ddb718029472f91a patch-3.14-rc6-git2.xz
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