From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Peter Collingbourne <pcc@google.com>,
Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>
Subject: [PATCH 5.18 19/35] arm64: set UXN on swapper page tables
Date: Tue, 9 Aug 2022 20:00:48 +0200 [thread overview]
Message-ID: <20220809175515.739951080@linuxfoundation.org> (raw)
In-Reply-To: <20220809175515.046484486@linuxfoundation.org>
From: Peter Collingbourne <pcc@google.com>
[ This issue was fixed upstream by accident in c3cee924bd85 ("arm64:
head: cover entire kernel image in initial ID map") as part of a
large refactoring of the arm64 boot flow. This simple fix is therefore
preferred for -stable backporting ]
On a system that implements FEAT_EPAN, read/write access to the idmap
is denied because UXN is not set on the swapper PTEs. As a result,
idmap_kpti_install_ng_mappings panics the kernel when accessing
__idmap_kpti_flag. Fix it by setting UXN on these PTEs.
Fixes: 18107f8a2df6 ("arm64: Support execute-only permissions with Enhanced PAN")
Cc: <stable@vger.kernel.org> # 5.15
Link: https://linux-review.googlesource.com/id/Ic452fa4b4f74753e54f71e61027e7222a0fae1b1
Signed-off-by: Peter Collingbourne <pcc@google.com>
Acked-by: Will Deacon <will@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220719234909.1398992-1-pcc@google.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm64/include/asm/kernel-pgtable.h | 4 ++--
arch/arm64/kernel/head.S | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
--- a/arch/arm64/include/asm/kernel-pgtable.h
+++ b/arch/arm64/include/asm/kernel-pgtable.h
@@ -103,8 +103,8 @@
/*
* Initial memory map attributes.
*/
-#define SWAPPER_PTE_FLAGS (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
-#define SWAPPER_PMD_FLAGS (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
+#define SWAPPER_PTE_FLAGS (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED | PTE_UXN)
+#define SWAPPER_PMD_FLAGS (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S | PMD_SECT_UXN)
#if ARM64_KERNEL_USES_PMD_MAPS
#define SWAPPER_MM_MMUFLAGS (PMD_ATTRINDX(MT_NORMAL) | SWAPPER_PMD_FLAGS)
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -285,7 +285,7 @@ SYM_FUNC_START_LOCAL(__create_page_table
subs x1, x1, #64
b.ne 1b
- mov x7, SWAPPER_MM_MMUFLAGS
+ mov_q x7, SWAPPER_MM_MMUFLAGS
/*
* Create the identity mapping.
next prev parent reply other threads:[~2022-08-09 18:24 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-09 18:00 [PATCH 5.18 00/35] 5.18.17-rc1 review Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 01/35] x86/speculation: Make all RETbleed mitigations 64-bit only Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 02/35] block: fix default IO priority handling again Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 03/35] tools/vm/slabinfo: Handle files in debugfs Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 04/35] ACPI: video: Force backlight native for some TongFang devices Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 05/35] ACPI: video: Shortening quirk list by identifying Clevo by board_name only Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 06/35] ACPI: APEI: Better fix to avoid spamming the console with old error logs Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 07/35] crypto: arm64/poly1305 - fix a read out-of-bound Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 08/35] KVM: x86: do not report a vCPU as preempted outside instruction boundaries Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 09/35] KVM: x86: do not set st->preempted when going back to user space Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 10/35] KVM: selftests: Make hyperv_clock selftest more stable Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 11/35] KVM: x86/MMU: Zap non-leaf SPTEs when disabling dirty logging Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 12/35] entry/kvm: Exit to user mode when TIF_NOTIFY_SIGNAL is set Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 13/35] KVM: x86: disable preemption while updating apicv inhibition Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 14/35] KVM: x86: disable preemption around the call to kvm_arch_vcpu_{un|}blocking Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 15/35] KVM: selftests: Restrict test region to 48-bit physical addresses when using nested Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 16/35] tools/kvm_stat: fix display of error when multiple processes are found Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 17/35] selftests: KVM: Handle compiler optimizations in ucall Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 18/35] KVM: x86/svm: add __GFP_ACCOUNT to __sev_dbg_{en,de}crypt_user() Greg Kroah-Hartman
2022-08-09 18:00 ` Greg Kroah-Hartman [this message]
2022-08-09 18:00 ` [PATCH 5.18 20/35] btrfs: zoned: prevent allocation from previous data relocation BG Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 21/35] btrfs: zoned: fix critical section of relocation inode writeback Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 22/35] btrfs: zoned: drop optimization of zone finish Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 23/35] Bluetooth: hci_qca: Return wakeup for qca_wakeup Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 24/35] Bluetooth: hci_bcm: Add BCM4349B1 variant Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 25/35] Bluetooth: hci_bcm: Add DT compatible for CYW55572 Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 26/35] dt-bindings: bluetooth: broadcom: Add BCM4349B1 DT binding Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 27/35] Bluetooth: btusb: Add support of IMC Networks PID 0x3568 Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 28/35] Bluetooth: btusb: Add Realtek RTL8852C support ID 0x04CA:0x4007 Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 29/35] Bluetooth: btusb: Add Realtek RTL8852C support ID 0x04C5:0x1675 Greg Kroah-Hartman
2022-08-09 18:00 ` [PATCH 5.18 30/35] Bluetooth: btusb: Add Realtek RTL8852C support ID 0x0CB8:0xC558 Greg Kroah-Hartman
2022-08-09 18:01 ` [PATCH 5.18 31/35] Bluetooth: btusb: Add Realtek RTL8852C support ID 0x13D3:0x3587 Greg Kroah-Hartman
2022-08-09 18:01 ` [PATCH 5.18 32/35] Bluetooth: btusb: Add Realtek RTL8852C support ID 0x13D3:0x3586 Greg Kroah-Hartman
2022-08-09 18:01 ` [PATCH 5.18 33/35] macintosh/adb: fix oob read in do_adb_query() function Greg Kroah-Hartman
2022-08-09 18:01 ` [PATCH 5.18 34/35] x86/speculation: Add RSB VM Exit protections Greg Kroah-Hartman
2022-08-09 18:01 ` [PATCH 5.18 35/35] x86/speculation: Add LFENCE to RSB fill sequence Greg Kroah-Hartman
2022-08-09 21:47 ` [PATCH 5.18 00/35] 5.18.17-rc1 review Florian Fainelli
2022-08-10 6:16 ` Naresh Kamboju
2022-08-10 12:54 ` Ron Economos
2022-08-10 13:26 ` Sudip Mukherjee (Codethink)
2022-08-10 13:33 ` Guenter Roeck
2022-08-10 14:17 ` Justin Forbes
2022-08-10 14:31 ` Shuah Khan
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