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scsi-generic: avoid possible out-of-bounds access to r->buf 

Whenever the allocation length of a SCSI request is shorter than the size of the
VPD page list, page_idx is used blindly to index into r->buf.  Even though
the stores in the insertion sort are protected against overflows, the same is not
true of the reads and the final store of 0xb0.

This basically does the same thing as commit 57dbb58d80 ("scsi-generic: avoid
out-of-bounds access to VPD page list", 2018-11-06), except that here the
allocation length can be chosen by the guest.  Note that according to the SCSI
standard, the contents of the PAGE LENGTH field are not altered based
on the allocation length.

The code was introduced by commit 6c219fc8a1 ("scsi-generic: keep VPD
page list sorted", 2018-11-06) but the overflow was already possible before.

Reported-by: Kevin Wolf <kwolf@redhat.com>
Fixes: a71c775b24
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-01-11 17:27:31 +01:00
parent 7b0f97bade
commit e909ff9369
1 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
hw/scsi/scsi-generic.c
View File

@ -182,7 +182,7 @@ static void scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s)
/* Also take care of the opt xfer len. */
stl_be_p(&r->buf[12],
MIN_NON_ZERO(max_transfer, ldl_be_p(&r->buf[12])));
} else if (s->needs_vpd_bl_emulation && page == 0x00) {
} else if (s->needs_vpd_bl_emulation && page == 0x00 && r->buflen >= 4) {
/*
* Now we're capable of supplying the VPD Block Limits
* response if the hardware can't. Add it in the INQUIRY
@ -193,18 +193,20 @@ static void scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s)
* and will use it to proper setup the SCSI device.
*
* VPD page numbers must be sorted, so insert 0xb0 at the
* right place with an in-place insert. After the initialization
* part of the for loop is executed, the device response is
* at r[0] to r[page_idx - 1].
* right place with an in-place insert. When the while loop
* begins the device response is at r[0] to r[page_idx - 1].
*/
for (page_idx = lduw_be_p(r->buf + 2) + 4;
page_idx > 4 && r->buf[page_idx - 1] >= 0xb0;
page_idx--) {
page_idx = lduw_be_p(r->buf + 2) + 4;
page_idx = MIN(page_idx, r->buflen);
while (page_idx > 4 && r->buf[page_idx - 1] >= 0xb0) {
if (page_idx < r->buflen) {
r->buf[page_idx] = r->buf[page_idx - 1];
}
page_idx--;
}
if (page_idx < r->buflen) {
r->buf[page_idx] = 0xb0;
}
r->buf[page_idx] = 0xb0;
stw_be_p(r->buf + 2, lduw_be_p(r->buf + 2) + 1);
}
}