From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
Jordy Zomer <jordy@jordyzomer.github.io>,
Mike Snitzer <snitzer@redhat.com>,
snitzer@kernel.org, dm-devel@redhat.com,
Jordy Zomer <jordy@pwning.systems>,
agk@redhat.com
Subject: [dm-devel] [PATCH AUTOSEL 4.14 10/22] dm ioctl: prevent potential spectre v1 gadget
Date: Fri, 1 Apr 2022 10:47:17 -0400 [thread overview]
Message-ID: <20220401144729.1955554-10-sashal@kernel.org> (raw)
In-Reply-To: <20220401144729.1955554-1-sashal@kernel.org>
[-- Attachment #1: Type: application/octet-stream, Size: 1187 bytes --]
From: Jordy Zomer <jordy@jordyzomer.github.io>
[ Upstream commit cd9c88da171a62c4b0f1c70e50c75845969fbc18 ]
It appears like cmd could be a Spectre v1 gadget as it's supplied by a
user and used as an array index. Prevent the contents of kernel memory
from being leaked to userspace via speculative execution by using
array_index_nospec.
Signed-off-by: Jordy Zomer <jordy@pwning.systems>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/md/dm-ioctl.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 2f020401d5ba..ddfea5324b58 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -17,6 +17,7 @@
#include <linux/dm-ioctl.h>
#include <linux/hdreg.h>
#include <linux/compat.h>
+#include <linux/nospec.h>
#include <linux/uaccess.h>
@@ -1669,6 +1670,7 @@ static ioctl_fn lookup_ioctl(unsigned int cmd, int *ioctl_flags)
if (unlikely(cmd >= ARRAY_SIZE(_ioctls)))
return NULL;
+ cmd = array_index_nospec(cmd, ARRAY_SIZE(_ioctls));
*ioctl_flags = _ioctls[cmd].flags;
return _ioctls[cmd].fn;
}
--
2.34.1
[-- Attachment #2: Type: text/plain, Size: 98 bytes --]
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WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jordy Zomer <jordy@jordyzomer.github.io>,
Jordy Zomer <jordy@pwning.systems>,
Mike Snitzer <snitzer@redhat.com>,
Sasha Levin <sashal@kernel.org>,
agk@redhat.com, snitzer@kernel.org, dm-devel@redhat.com
Subject: [PATCH AUTOSEL 4.14 10/22] dm ioctl: prevent potential spectre v1 gadget
Date: Fri, 1 Apr 2022 10:47:17 -0400 [thread overview]
Message-ID: <20220401144729.1955554-10-sashal@kernel.org> (raw)
In-Reply-To: <20220401144729.1955554-1-sashal@kernel.org>
From: Jordy Zomer <jordy@jordyzomer.github.io>
[ Upstream commit cd9c88da171a62c4b0f1c70e50c75845969fbc18 ]
It appears like cmd could be a Spectre v1 gadget as it's supplied by a
user and used as an array index. Prevent the contents of kernel memory
from being leaked to userspace via speculative execution by using
array_index_nospec.
Signed-off-by: Jordy Zomer <jordy@pwning.systems>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/md/dm-ioctl.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 2f020401d5ba..ddfea5324b58 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -17,6 +17,7 @@
#include <linux/dm-ioctl.h>
#include <linux/hdreg.h>
#include <linux/compat.h>
+#include <linux/nospec.h>
#include <linux/uaccess.h>
@@ -1669,6 +1670,7 @@ static ioctl_fn lookup_ioctl(unsigned int cmd, int *ioctl_flags)
if (unlikely(cmd >= ARRAY_SIZE(_ioctls)))
return NULL;
+ cmd = array_index_nospec(cmd, ARRAY_SIZE(_ioctls));
*ioctl_flags = _ioctls[cmd].flags;
return _ioctls[cmd].fn;
}
--
2.34.1
next prev parent reply other threads:[~2022-04-01 14:48 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-01 14:47 [PATCH AUTOSEL 4.14 01/22] ath5k: fix OOB in ath5k_eeprom_read_pcal_info_5111 Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 02/22] ptp: replace snprintf with sysfs_emit Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 03/22] powerpc: dts: t104xrdb: fix phy type for FMAN 4/5 Sasha Levin
2022-04-01 14:47 ` Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 04/22] scsi: mvsas: Replace snprintf() with sysfs_emit() Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 05/22] scsi: bfa: " Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 06/22] power: supply: axp20x_battery: properly report current when discharging Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 07/22] powerpc: Set crashkernel offset to mid of RMA region Sasha Levin
2022-04-01 14:47 ` Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 08/22] PCI: aardvark: Fix support for MSI interrupts Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 09/22] iommu/arm-smmu-v3: fix event handling soft lockup Sasha Levin
2022-04-01 14:47 ` Sasha Levin
2022-04-01 14:47 ` Sasha Levin [this message]
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 10/22] dm ioctl: prevent potential spectre v1 gadget Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 11/22] scsi: pm8001: Fix pm8001_mpi_task_abort_resp() Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 12/22] scsi: aha152x: Fix aha152x_setup() __setup handler return value Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 13/22] net/smc: correct settings of RMB window update limit Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 14/22] macvtap: advertise link netns via netlink Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 15/22] bnxt_en: Eliminate unintended link toggle during FW reset Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 16/22] MIPS: fix fortify panic when copying asm exception handlers Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 17/22] powerpc/code-patching: Pre-map patch area Sasha Levin
2022-04-01 14:47 ` Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 18/22] scsi: libfc: Fix use after free in fc_exch_abts_resp() Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 19/22] usb: dwc3: omap: fix "unbalanced disables for smps10_out1" on omap5evm Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 20/22] xtensa: fix DTC warning unit_address_format Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 21/22] Bluetooth: Fix use after free in hci_send_acl Sasha Levin
2022-04-01 14:47 ` [PATCH AUTOSEL 4.14 22/22] init/main.c: return 1 from handled __setup() functions Sasha Levin
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