From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Russell King <rmk+kernel@armlinux.org.uk>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 33/77] ARM: uaccess: consolidate uaccess asm to asm/uaccess-asm.h
Date: Mon, 1 Jun 2020 19:53:38 +0200 [thread overview]
Message-ID: <20200601174022.507416591@linuxfoundation.org> (raw)
In-Reply-To: <20200601174016.396817032@linuxfoundation.org>
From: Russell King <rmk+kernel@armlinux.org.uk>
[ Upstream commit 747ffc2fcf969eff9309d7f2d1d61cb8b9e1bb40 ]
Consolidate the user access assembly code to asm/uaccess-asm.h. This
moves the csdb, check_uaccess, uaccess_mask_range_ptr, uaccess_enable,
uaccess_disable, uaccess_save, uaccess_restore macros, and creates two
new ones for exception entry and exit - uaccess_entry and uaccess_exit.
This makes the uaccess_save and uaccess_restore macros private to
asm/uaccess-asm.h.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm/include/asm/assembler.h | 75 +-------------------
arch/arm/include/asm/uaccess-asm.h | 106 +++++++++++++++++++++++++++++
arch/arm/kernel/entry-armv.S | 11 +--
| 9 +--
4 files changed, 112 insertions(+), 89 deletions(-)
create mode 100644 arch/arm/include/asm/uaccess-asm.h
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
index 965224d14e6c..1935b580f0e8 100644
--- a/arch/arm/include/asm/assembler.h
+++ b/arch/arm/include/asm/assembler.h
@@ -21,11 +21,11 @@
#endif
#include <asm/ptrace.h>
-#include <asm/domain.h>
#include <asm/opcodes-virt.h>
#include <asm/asm-offsets.h>
#include <asm/page.h>
#include <asm/thread_info.h>
+#include <asm/uaccess-asm.h>
#define IOMEM(x) (x)
@@ -447,79 +447,6 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
.size \name , . - \name
.endm
- .macro csdb
-#ifdef CONFIG_THUMB2_KERNEL
- .inst.w 0xf3af8014
-#else
- .inst 0xe320f014
-#endif
- .endm
-
- .macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
-#ifndef CONFIG_CPU_USE_DOMAINS
- adds \tmp, \addr, #\size - 1
- sbcscc \tmp, \tmp, \limit
- bcs \bad
-#ifdef CONFIG_CPU_SPECTRE
- movcs \addr, #0
- csdb
-#endif
-#endif
- .endm
-
- .macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req
-#ifdef CONFIG_CPU_SPECTRE
- sub \tmp, \limit, #1
- subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr
- addhs \tmp, \tmp, #1 @ if (tmp >= 0) {
- subshs \tmp, \tmp, \size @ tmp = limit - (addr + size) }
- movlo \addr, #0 @ if (tmp < 0) addr = NULL
- csdb
-#endif
- .endm
-
- .macro uaccess_disable, tmp, isb=1
-#ifdef CONFIG_CPU_SW_DOMAIN_PAN
- /*
- * Whenever we re-enter userspace, the domains should always be
- * set appropriately.
- */
- mov \tmp, #DACR_UACCESS_DISABLE
- mcr p15, 0, \tmp, c3, c0, 0 @ Set domain register
- .if \isb
- instr_sync
- .endif
-#endif
- .endm
-
- .macro uaccess_enable, tmp, isb=1
-#ifdef CONFIG_CPU_SW_DOMAIN_PAN
- /*
- * Whenever we re-enter userspace, the domains should always be
- * set appropriately.
- */
- mov \tmp, #DACR_UACCESS_ENABLE
- mcr p15, 0, \tmp, c3, c0, 0
- .if \isb
- instr_sync
- .endif
-#endif
- .endm
-
- .macro uaccess_save, tmp
-#ifdef CONFIG_CPU_SW_DOMAIN_PAN
- mrc p15, 0, \tmp, c3, c0, 0
- str \tmp, [sp, #SVC_DACR]
-#endif
- .endm
-
- .macro uaccess_restore
-#ifdef CONFIG_CPU_SW_DOMAIN_PAN
- ldr r0, [sp, #SVC_DACR]
- mcr p15, 0, r0, c3, c0, 0
-#endif
- .endm
-
.irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo
.macro ret\c, reg
#if __LINUX_ARM_ARCH__ < 6
diff --git a/arch/arm/include/asm/uaccess-asm.h b/arch/arm/include/asm/uaccess-asm.h
new file mode 100644
index 000000000000..d475e3e8145d
--- /dev/null
+++ b/arch/arm/include/asm/uaccess-asm.h
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_UACCESS_ASM_H__
+#define __ASM_UACCESS_ASM_H__
+
+#include <asm/asm-offsets.h>
+#include <asm/domain.h>
+#include <asm/memory.h>
+#include <asm/thread_info.h>
+
+ .macro csdb
+#ifdef CONFIG_THUMB2_KERNEL
+ .inst.w 0xf3af8014
+#else
+ .inst 0xe320f014
+#endif
+ .endm
+
+ .macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
+#ifndef CONFIG_CPU_USE_DOMAINS
+ adds \tmp, \addr, #\size - 1
+ sbcscc \tmp, \tmp, \limit
+ bcs \bad
+#ifdef CONFIG_CPU_SPECTRE
+ movcs \addr, #0
+ csdb
+#endif
+#endif
+ .endm
+
+ .macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req
+#ifdef CONFIG_CPU_SPECTRE
+ sub \tmp, \limit, #1
+ subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr
+ addhs \tmp, \tmp, #1 @ if (tmp >= 0) {
+ subshs \tmp, \tmp, \size @ tmp = limit - (addr + size) }
+ movlo \addr, #0 @ if (tmp < 0) addr = NULL
+ csdb
+#endif
+ .endm
+
+ .macro uaccess_disable, tmp, isb=1
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ /*
+ * Whenever we re-enter userspace, the domains should always be
+ * set appropriately.
+ */
+ mov \tmp, #DACR_UACCESS_DISABLE
+ mcr p15, 0, \tmp, c3, c0, 0 @ Set domain register
+ .if \isb
+ instr_sync
+ .endif
+#endif
+ .endm
+
+ .macro uaccess_enable, tmp, isb=1
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ /*
+ * Whenever we re-enter userspace, the domains should always be
+ * set appropriately.
+ */
+ mov \tmp, #DACR_UACCESS_ENABLE
+ mcr p15, 0, \tmp, c3, c0, 0
+ .if \isb
+ instr_sync
+ .endif
+#endif
+ .endm
+
+ .macro uaccess_save, tmp
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ mrc p15, 0, \tmp, c3, c0, 0
+ str \tmp, [sp, #SVC_DACR]
+#endif
+ .endm
+
+ .macro uaccess_restore
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ ldr r0, [sp, #SVC_DACR]
+ mcr p15, 0, r0, c3, c0, 0
+#endif
+ .endm
+
+ /*
+ * Save the address limit on entry to a privileged exception and
+ * if using PAN, save and disable usermode access.
+ */
+ .macro uaccess_entry, tsk, tmp0, tmp1, tmp2, disable
+ ldr \tmp0, [\tsk, #TI_ADDR_LIMIT]
+ mov \tmp1, #TASK_SIZE
+ str \tmp1, [\tsk, #TI_ADDR_LIMIT]
+ str \tmp0, [sp, #SVC_ADDR_LIMIT]
+ uaccess_save \tmp0
+ .if \disable
+ uaccess_disable \tmp0
+ .endif
+ .endm
+
+ /* Restore the user access state previously saved by uaccess_entry */
+ .macro uaccess_exit, tsk, tmp0, tmp1
+ ldr \tmp1, [sp, #SVC_ADDR_LIMIT]
+ uaccess_restore
+ str \tmp1, [\tsk, #TI_ADDR_LIMIT]
+ .endm
+
+#endif /* __ASM_UACCESS_ASM_H__ */
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index fbc707626b3e..f3de76f7ad43 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -30,6 +30,7 @@
#include <asm/unistd.h>
#include <asm/tls.h>
#include <asm/system_info.h>
+#include <asm/uaccess-asm.h>
#include "entry-header.S"
#include <asm/entry-macro-multi.S>
@@ -186,15 +187,7 @@ ENDPROC(__und_invalid)
stmia r7, {r2 - r6}
get_thread_info tsk
- ldr r0, [tsk, #TI_ADDR_LIMIT]
- mov r1, #TASK_SIZE
- str r1, [tsk, #TI_ADDR_LIMIT]
- str r0, [sp, #SVC_ADDR_LIMIT]
-
- uaccess_save r0
- .if \uaccess
- uaccess_disable r0
- .endif
+ uaccess_entry tsk, r0, r1, r2, \uaccess
.if \trace
#ifdef CONFIG_TRACE_IRQFLAGS
--git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index 62db1c9746cb..7b595f2d4a28 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -6,6 +6,7 @@
#include <asm/asm-offsets.h>
#include <asm/errno.h>
#include <asm/thread_info.h>
+#include <asm/uaccess-asm.h>
#include <asm/v7m.h>
@ Bad Abort numbers
@@ -217,9 +218,7 @@
blne trace_hardirqs_off
#endif
.endif
- ldr r1, [sp, #SVC_ADDR_LIMIT]
- uaccess_restore
- str r1, [tsk, #TI_ADDR_LIMIT]
+ uaccess_exit tsk, r0, r1
#ifndef CONFIG_THUMB2_KERNEL
@ ARM mode SVC restore
@@ -263,9 +262,7 @@
@ on the stack remains correct).
@
.macro svc_exit_via_fiq
- ldr r1, [sp, #SVC_ADDR_LIMIT]
- uaccess_restore
- str r1, [tsk, #TI_ADDR_LIMIT]
+ uaccess_exit tsk, r0, r1
#ifndef CONFIG_THUMB2_KERNEL
@ ARM mode restore
mov r0, sp
--
2.25.1
next prev parent reply other threads:[~2020-06-01 18:56 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-01 17:53 [PATCH 4.14 00/77] 4.14.183-rc1 review Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 01/77] ax25: fix setsockopt(SO_BINDTODEVICE) Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 02/77] net: ipip: fix wrong address family in init error path Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 03/77] net/mlx5: Add command entry handling completion Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 04/77] net: revert "net: get rid of an signed integer overflow in ip_idents_reserve()" Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 05/77] net sched: fix reporting the first-time use timestamp Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 06/77] r8152: support additional Microsoft Surface Ethernet Adapter variant Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 07/77] sctp: Start shutdown on association restart if in SHUTDOWN-SENT state and socket is closed Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 08/77] net/mlx5e: Update netdev txq on completions during closure Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 09/77] net: qrtr: Fix passing invalid reference to qrtr_local_enqueue() Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 10/77] net: sun: fix missing release regions in cas_init_one() Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 11/77] net/mlx4_core: fix a memory leak bug Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 12/77] ARM: dts: rockchip: fix phy nodename for rk3228-evb Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 13/77] arm64: dts: rockchip: swap interrupts interrupt-names rk3399 gpu node Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 14/77] ARM: dts: rockchip: fix pinctrl sub nodename for spi in rk322x.dtsi Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 15/77] gpio: tegra: mask GPIO IRQs during IRQ shutdown Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 16/77] net: microchip: encx24j600: add missed kthread_stop Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 17/77] gfs2: move privileged user check to gfs2_quota_lock_check Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 18/77] gfs2: dont call quota_unhold if quotas are not locked Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 19/77] cachefiles: Fix race between read_waiter and read_copier involving op->to_do Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 20/77] usb: gadget: legacy: fix redundant initialization warnings Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 21/77] net: freescale: select CONFIG_FIXED_PHY where needed Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 22/77] cifs: Fix null pointer check in cifs_read Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 23/77] samples: bpf: Fix build error Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 24/77] Input: usbtouchscreen - add support for BonXeon TP Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 25/77] Input: i8042 - add ThinkPad S230u to i8042 nomux list Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 26/77] Input: evdev - call input_flush_device() on release(), not flush() Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 27/77] Input: xpad - add custom init packet for Xbox One S controllers Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 28/77] Input: dlink-dir685-touchkeys - fix a typo in driver name Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 29/77] Input: i8042 - add ThinkPad S230u to i8042 reset list Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 30/77] Input: synaptics-rmi4 - really fix attn_data use-after-free Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 31/77] Input: synaptics-rmi4 - fix error return code in rmi_driver_probe() Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 32/77] ARM: 8843/1: use unified assembler in headers Greg Kroah-Hartman
2020-06-01 17:53 ` Greg Kroah-Hartman [this message]
2020-06-01 17:53 ` [PATCH 4.14 34/77] ARM: uaccess: integrate uaccess_save and uaccess_restore Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 35/77] ARM: uaccess: fix DACR mismatch with nested exceptions Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 36/77] gpio: exar: Fix bad handling for ida_simple_get error path Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 37/77] IB/qib: Call kobject_put() when kobject_init_and_add() fails Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 38/77] ARM: dts: imx6q-bx50v3: Add internal switch Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 39/77] ARM: dts/imx6q-bx50v3: Set display interface clock parents Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 40/77] ARM: dts: bcm2835-rpi-zero-w: Fix led polarity Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 41/77] mmc: block: Fix use-after-free issue for rpmb Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 42/77] RDMA/pvrdma: Fix missing pci disable in pvrdma_pci_probe() Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 43/77] ALSA: hwdep: fix a left shifting 1 by 31 UB bug Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 44/77] ALSA: usb-audio: mixer: volume quirk for ESS Technology Asus USB DAC Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 45/77] exec: Always set cap_ambient in cap_bprm_set_creds Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 46/77] ALSA: hda/realtek - Add new codec supported for ALC287 Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 47/77] libceph: ignore pool overlay and cache logic on redirects Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 48/77] mm: remove VM_BUG_ON(PageSlab()) from page_mapcount() Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 49/77] fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info() Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 50/77] include/asm-generic/topology.h: guard cpumask_of_node() macro argument Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 51/77] iommu: Fix reference count leak in iommu_group_alloc Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 52/77] parisc: Fix kernel panic in mem_init() Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 53/77] mac80211: mesh: fix discovery timer re-arming issue / crash Greg Kroah-Hartman
2020-06-01 17:53 ` [PATCH 4.14 54/77] x86/dma: Fix max PFN arithmetic overflow on 32 bit systems Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 55/77] copy_xstate_to_kernel(): dont leave parts of destination uninitialized Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 56/77] xfrm: allow to accept packets with ipv6 NEXTHDR_HOP in xfrm_input Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 57/77] xfrm: call xfrm_output_gso when inner_protocol is set in xfrm_output Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 58/77] xfrm: fix a warning in xfrm_policy_insert_list Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 59/77] xfrm: fix a NULL-ptr deref in xfrm_local_error Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 60/77] xfrm: fix error in comment Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 61/77] vti4: eliminated some duplicate code Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 62/77] ip_vti: receive ipip packet by calling ip_tunnel_rcv Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 63/77] netfilter: nft_reject_bridge: enable reject with bridge vlan Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 64/77] netfilter: ipset: Fix subcounter update skip Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 65/77] netfilter: nfnetlink_cthelper: unbreak userspace helper support Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 66/77] netfilter: nf_conntrack_pptp: prevent buffer overflows in debug code Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 67/77] esp6: get the right proto for transport mode in esp6_gso_encap Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 68/77] qlcnic: fix missing release in qlcnic_83xx_interrupt_test Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 69/77] bonding: Fix reference count leak in bond_sysfs_slave_add Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 70/77] Revert "Input: i8042 - add ThinkPad S230u to i8042 nomux list" Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 71/77] netfilter: nf_conntrack_pptp: fix compilation warning with W=1 build Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 72/77] mm/vmalloc.c: dont dereference possible NULL pointer in __vunmap() Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 73/77] sc16is7xx: move label err_spi to correct section Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 74/77] rxrpc: Fix transport sockopts to get IPv4 errors on an IPv6 socket Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 75/77] KVM: VMX: check for existence of secondary exec controls before accessing Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 76/77] net: hns: fix unsigned comparison to less than zero Greg Kroah-Hartman
2020-06-01 17:54 ` [PATCH 4.14 77/77] net: hns: Fixes the missing put_device in positive leg for roce reset Greg Kroah-Hartman
2020-06-02 7:34 ` [PATCH 4.14 00/77] 4.14.183-rc1 review Naresh Kamboju
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