linux

korg/linux

mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-02 00:24:12 +08:00

Go to file

Quentin Perret 56961c6331 KVM: arm64: Prevent kmemleak from accessing pKVM memory Commit `a7259df767` ("memblock: make memblock_find_in_range method private") changed the API using which memory is reserved for the pKVM hypervisor. However, memblock_phys_alloc() differs from the original API in terms of kmemleak semantics -- the old one didn't report the reserved regions to kmemleak while the new one does. Unfortunately, when protected KVM is enabled, all kernel accesses to pKVM-private memory result in a fatal exception, which can now happen because of kmemleak scans: $ echo scan > /sys/kernel/debug/kmemleak [ 34.991354] kvm [304]: nVHE hyp BUG at: [<ffff800008fa3750>] __kvm_nvhe_handle_host_mem_abort+0x270/0x290! [ 34.991580] kvm [304]: Hyp Offset: 0xfffe8be807e00000 [ 34.991813] Kernel panic - not syncing: HYP panic: [ 34.991813] PS:600003c9 PC:0000f418011a3750 ESR:00000000f2000800 [ 34.991813] FAR:ffff000439200000 HPFAR:0000000004792000 PAR:0000000000000000 [ 34.991813] VCPU:0000000000000000 [ 34.993660] CPU: 0 PID: 304 Comm: bash Not tainted 5.19.0-rc2 #102 [ 34.994059] Hardware name: linux,dummy-virt (DT) [ 34.994452] Call trace: [ 34.994641] dump_backtrace.part.0+0xcc/0xe0 [ 34.994932] show_stack+0x18/0x6c [ 34.995094] dump_stack_lvl+0x68/0x84 [ 34.995276] dump_stack+0x18/0x34 [ 34.995484] panic+0x16c/0x354 [ 34.995673] __hyp_pgtable_total_pages+0x0/0x60 [ 34.995933] scan_block+0x74/0x12c [ 34.996129] scan_gray_list+0xd8/0x19c [ 34.996332] kmemleak_scan+0x2c8/0x580 [ 34.996535] kmemleak_write+0x340/0x4a0 [ 34.996744] full_proxy_write+0x60/0xbc [ 34.996967] vfs_write+0xc4/0x2b0 [ 34.997136] ksys_write+0x68/0xf4 [ 34.997311] __arm64_sys_write+0x20/0x2c [ 34.997532] invoke_syscall+0x48/0x114 [ 34.997779] el0_svc_common.constprop.0+0x44/0xec [ 34.998029] do_el0_svc+0x2c/0xc0 [ 34.998205] el0_svc+0x2c/0x84 [ 34.998421] el0t_64_sync_handler+0xf4/0x100 [ 34.998653] el0t_64_sync+0x18c/0x190 [ 34.999252] SMP: stopping secondary CPUs [ 35.000034] Kernel Offset: disabled [ 35.000261] CPU features: 0x800,00007831,00001086 [ 35.000642] Memory Limit: none [ 35.001329] ---[ end Kernel panic - not syncing: HYP panic: [ 35.001329] PS:600003c9 PC:0000f418011a3750 ESR:00000000f2000800 [ 35.001329] FAR:ffff000439200000 HPFAR:0000000004792000 PAR:0000000000000000 [ 35.001329] VCPU:0000000000000000 ]--- Fix this by explicitly excluding the hypervisor's memory pool from kmemleak like we already do for the hyp BSS. Cc: Mike Rapoport <rppt@kernel.org> Fixes: `a7259df767` ("memblock: make memblock_find_in_range method private") Signed-off-by: Quentin Perret <qperret@google.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220616161135.3997786-1-qperret@google.com		2022-06-17 09:48:38 +01:00
arch	KVM: arm64: Prevent kmemleak from accessing pKVM memory	2022-06-17 09:48:38 +01:00
block	for-5.19/drivers-2022-06-02	2022-06-03 10:25:56 -07:00
certs	Kbuild updates for v5.19	2022-05-26 12:09:50 -07:00
crypto	This update includes the following changes:	2022-05-27 18:06:49 -07:00
Documentation	KVM: arm64: Ignore 'kvm-arm.mode=protected' when using VHE	2022-06-09 13:24:02 +01:00
drivers	fix for breakage in #work.fd this window	2022-06-05 17:14:03 -07:00
fs	fix for breakage in #work.fd this window	2022-06-05 17:14:03 -07:00
include	A single featurelet for delay accounting. Delayed a bit	2022-06-05 16:58:27 -07:00
init	This set of changes updates init and user mode helper tasks to be	2022-06-03 16:03:05 -07:00
ipc	These changes update the ipc sysctls so that they are fundamentally	2022-06-03 15:54:57 -07:00
kernel	A single featurelet for delay accounting. Delayed a bit	2022-06-05 16:58:27 -07:00
lib	Bitmap patches for 5.19-rc1	2022-06-04 14:04:27 -07:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	Hot fixes for 5.19-rc1.	2022-06-05 17:05:38 -07:00
net	bluetooth: don't use bitmaps for random flag accesses	2022-06-05 16:28:41 -07:00
samples	drm for 5.19-rc1	2022-05-25 16:18:27 -07:00
scripts	A set of objtool fixes:	2022-06-05 09:45:27 -07:00
security	Cleanups (and one fix) around struct mount handling.	2022-06-04 19:00:05 -07:00
sound	USB / Thunderbolt changes for 5.19-rc1	2022-06-03 11:17:49 -07:00
tools	A single featurelet for delay accounting. Delayed a bit	2022-06-05 16:58:27 -07:00
usr	Not a lot of material this cycle. Many singleton patches against various	2022-05-27 11:22:03 -07:00
virt	VFIO updates for v5.19-rc1	2022-06-01 13:49:15 -07:00
.clang-format	clang-format: Fix space after for_each macros	2022-05-20 19:27:16 +02:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	kbuild: split the second line of .mod into .usyms	2022-05-08 03:16:59 +09:00
.mailmap	Hot fixes for 5.19-rc1.	2022-06-05 17:05:38 -07:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: replace a Microchip AT91 maintainer	2022-02-09 11:30:01 +01:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Hot fixes for 5.19-rc1.	2022-06-05 17:05:38 -07:00
Makefile	Linux 5.19-rc1	2022-06-05 17:18:54 -07:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.