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CVE-XXXX-XXXX potential memory corruption in vhost/scsi driver (rhbz 1189864 1192079)

This commit is contained in:
Josh Boyer 2015-02-16 14:32:42 -05:00
parent 9d95825dc3
commit 6e84c26d41
2 changed files with 60 additions and 0 deletions
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7
kernel.spec
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@ -644,6 +644,9 @@ Patch30004: acpi-video-add-disable_native_backlight_quirk_for_samsung_510r.patch
#CVE-2015-1593 rhbz 1192519 1192520
Patch26135: ASLR-fix-stack-randomization-on-64-bit-systems.patch
#CVE-XXXX-XXXX rhbz 1189864 1192079
Patch26136: vhost-scsi-potential-memory-corruption.patch
# END OF PATCH DEFINITIONS
%endif
@ -1393,6 +1396,9 @@ ApplyPatch acpi-video-add-disable_native_backlight_quirk_for_samsung_510r.patch
#CVE-2015-1593 rhbz 1192519 1192520
ApplyPatch ASLR-fix-stack-randomization-on-64-bit-systems.patch
#CVE-XXXX-XXXX rhbz 1189864 1192079
ApplyPatch vhost-scsi-potential-memory-corruption.patch
%if 0%{?aarch64patches}
ApplyPatch kernel-arm64.patch
%ifnarch aarch64 # this is stupid, but i want to notice before secondary koji does.
@ -2264,6 +2270,7 @@ fi
# || ||
%changelog
* Mon Feb 16 2015 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-XXXX-XXXX potential memory corruption in vhost/scsi driver (rhbz 1189864 1192079)
- CVE-2015-1593 stack ASLR integer overflow (rhbz 1192519 1192520)
* Wed Feb 11 2015 Justin M. Forbes <jforbes@fedoraproject.org> - 3.18.7-200

53
vhost-scsi-potential-memory-corruption.patch Normal file
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@ -0,0 +1,53 @@
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 5 Feb 2015 10:37:33 +0300
Subject: [PATCH] vhost/scsi: potential memory corruption
This code in vhost_scsi_make_tpg() is confusing because we limit "tpgt"
to UINT_MAX but the data type of "tpg->tport_tpgt" and that is a u16.
I looked at the context and it turns out that in
vhost_scsi_set_endpoint(), "tpg->tport_tpgt" is used as an offset into
the vs_tpg[] array which has VHOST_SCSI_MAX_TARGET (256) elements so
anything higher than 255 then it is invalid. I have made that the limit
now.
In vhost_scsi_send_evt() we mask away values higher than 255, but now
that the limit has changed, we don't need the mask.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/vhost/scsi.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index cb84f69f76ad..28cf2510d33b 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -1251,7 +1251,7 @@ tcm_vhost_send_evt(struct vhost_scsi *vs,
* lun[4-7] need to be zero according to virtio-scsi spec.
*/
evt->event.lun[0] = 0x01;
- evt->event.lun[1] = tpg->tport_tpgt & 0xFF;
+ evt->event.lun[1] = tpg->tport_tpgt;
if (lun->unpacked_lun >= 256)
evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
evt->event.lun[3] = lun->unpacked_lun & 0xFF;
@@ -2122,12 +2122,12 @@ tcm_vhost_make_tpg(struct se_wwn *wwn,
struct tcm_vhost_tport, tport_wwn);
struct tcm_vhost_tpg *tpg;
- unsigned long tpgt;
+ u16 tpgt;
int ret;
if (strstr(name, "tpgt_") != name)
return ERR_PTR(-EINVAL);
- if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
+ if (kstrtou16(name + 5, 10, &tpgt) || tpgt > VHOST_SCSI_MAX_TARGET)
return ERR_PTR(-EINVAL);
tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
--
2.1.0