Quentin Perret a6b22d1143 KVM: arm64: Prevent kmemleak from accessing pKVM memory ... [ Upstream commit 56961c6331 ] 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 Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-06-29 09:04:30 +02:00
..
alpha	alpha: fix alloc_zeroed_user_highpage_movable()	2022-06-09 10:29:51 +02:00
arc	ARC: remove redundant READ_ONCE() in cmpxchg loop	2022-04-18 14:47:05 -07:00
arm	ep93xx: clock: Do not return the address of the freed memory	2022-06-14 18:44:55 +02:00
arm64	KVM: arm64: Prevent kmemleak from accessing pKVM memory	2022-06-29 09:04:30 +02:00
csky	csky: patch_text: Fixup last cpu should be master	2022-06-09 10:30:50 +02:00
h8300	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2022-04-01 19:57:03 -07:00
hexagon	ptrace: Cleanups for v5.18	2022-03-28 17:29:53 -07:00
ia64	ia64: define get_cycles macro for arch-override	2022-05-30 09:24:04 +02:00
m68k	m68knommu: fix undefined reference to `mach_get_rtc_pll'	2022-06-14 18:45:03 +02:00
microblaze	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
mips	mips: cpc: Fix refcount leak in mips_cpc_default_phys_base	2022-06-14 18:45:01 +02:00
nios2	nios2: use fallback for random_get_entropy() instead of zero	2022-05-30 09:24:05 +02:00
openrisc	openrisc: start CPU timer early in boot	2022-06-09 10:29:44 +02:00
parisc	parisc/stifb: Implement fb_is_primary_device()	2022-06-09 10:29:26 +02:00
powerpc	powerpc/book3e: get rid of #include <generated/compile.h>	2022-06-22 14:28:12 +02:00
riscv	riscv: dts: microchip: re-add pdma to mpfs device tree	2022-06-22 14:27:59 +02:00
s390	s390/mm: use non-quiescing sske for KVM switch to keyed guest	2022-06-25 15:29:46 +02:00
sh	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2022-04-01 19:57:03 -07:00
sparc	signal: Deliver SIGTRAP on perf event asynchronously if blocked	2022-06-09 10:30:00 +02:00
um	um: line: Use separate IRQs per line	2022-06-14 18:45:13 +02:00
x86	bpf, x86: Fix tail call count offset calculation on bpf2bpf call	2022-06-29 09:04:30 +02:00
xtensa	xtensa/simdisk: fix proc_read_simdisk()	2022-06-09 10:30:52 +02:00
.gitignore
Kconfig	vmalloc: replace VM_NO_HUGE_VMAP with VM_ALLOW_HUGE_VMAP	2022-04-19 12:08:57 -07:00