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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.9 25/32] arm64: kprobe: Always blacklist the KVM world-switch code
Date: Sat, 23 Feb 2019 16:09:44 -0500	[thread overview]
Message-ID: <20190223210951.202268-25-sashal@kernel.org> (raw)
In-Reply-To: <20190223210951.202268-1-sashal@kernel.org>

From: James Morse <james.morse@arm.com>

[ Upstream commit f2b3d8566d81deaca31f4e3163def0bea7746e11 ]

On systems with VHE the kernel and KVM's world-switch code run at the
same exception level. Code that is only used on a VHE system does not
need to be annotated as __hyp_text as it can reside anywhere in the
 kernel text.

__hyp_text was also used to prevent kprobes from patching breakpoint
instructions into this region, as this code runs at a different
exception level. While this is no longer true with VHE, KVM still
switches VBAR_EL1, meaning a kprobe's breakpoint executed in the
world-switch code will cause a hyp-panic.

Move the __hyp_text check in the kprobes blacklist so it applies on
VHE systems too, to cover the common code and guest enter/exit
assembly.

Fixes: 888b3c8720e0 ("arm64: Treat all entry code as non-kprobe-able")
Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm64/kernel/probes/kprobes.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
index 30bcae0aef2a0..d2b1b624ddc3c 100644
--- a/arch/arm64/kernel/probes/kprobes.c
+++ b/arch/arm64/kernel/probes/kprobes.c
@@ -546,13 +546,13 @@ bool arch_within_kprobe_blacklist(unsigned long addr)
 	    addr < (unsigned long)__entry_text_end) ||
 	    (addr >= (unsigned long)__idmap_text_start &&
 	    addr < (unsigned long)__idmap_text_end) ||
+	    (addr >= (unsigned long)__hyp_text_start &&
+	    addr < (unsigned long)__hyp_text_end) ||
 	    !!search_exception_tables(addr))
 		return true;
 
 	if (!is_kernel_in_hyp_mode()) {
-		if ((addr >= (unsigned long)__hyp_text_start &&
-		    addr < (unsigned long)__hyp_text_end) ||
-		    (addr >= (unsigned long)__hyp_idmap_text_start &&
+		if ((addr >= (unsigned long)__hyp_idmap_text_start &&
 		    addr < (unsigned long)__hyp_idmap_text_end))
 			return true;
 	}
-- 
2.19.1


  parent reply	other threads:[~2019-02-23 21:10 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-23 21:09 [PATCH AUTOSEL 4.9 01/32] vti4: Fix a ipip packet processing bug in 'IPCOMP' virtual tunnel Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 02/32] xfrm: refine validation of template and selector families Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 03/32] perf core: Fix perf_proc_update_handler() bug Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 04/32] perf tools: Handle TOPOLOGY headers with no CPU Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 05/32] IB/{hfi1, qib}: Fix WC.byte_len calculation for UD_SEND_WITH_IMM Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 06/32] iommu/amd: Call free_iova_fast with pfn in map_sg Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 07/32] iommu/amd: Unmap all mapped pages in error path of map_sg Sasha Levin
2019-02-23 21:09   ` Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 08/32] ipvs: Fix signed integer overflow when setsockopt timeout Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 09/32] iommu/amd: Fix IOMMU page flush when detach device from a domain Sasha Levin
2019-02-23 21:09   ` Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 10/32] xtensa: SMP: fix ccount_timer_shutdown Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 11/32] xtensa: SMP: fix secondary CPU initialization Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 12/32] xtensa: smp_lx200_defconfig: fix vectors clash Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 13/32] xtensa: SMP: mark each possible CPU as present Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 14/32] xtensa: SMP: limit number of possible CPUs by NR_CPUS Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 15/32] net: altera_tse: fix msgdma_tx_completion on non-zero fill_level case Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 16/32] net: hns: Fix for missing of_node_put() after of_parse_phandle() Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 17/32] net: hns: Fix wrong read accesses via Clause 45 MDIO protocol Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 18/32] net: stmmac: dwmac-rk: fix error handling in rk_gmac_powerup() Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 19/32] gpio: vf610: Mask all GPIO interrupts Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 20/32] nfs: Fix NULL pointer dereference of dev_name Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 21/32] qed: Fix VF probe failure while FLR Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 22/32] scsi: libfc: free skb when receiving invalid flogi resp Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 23/32] platform/x86: Fix unmet dependency warning for SAMSUNG_Q10 Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 24/32] cifs: fix computation for MAX_SMB2_HDR_SIZE Sasha Levin
2019-02-23 21:09 ` Sasha Levin [this message]
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 26/32] x86/kexec: Don't setup EFI info if EFI runtime is not enabled Sasha Levin
2019-02-23 21:09   ` Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 27/32] x86_64: increase stack size for KASAN_EXTRA Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 28/32] mm, memory_hotplug: is_mem_section_removable do not pass the end of a zone Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 29/32] mm, memory_hotplug: test_pages_in_a_zone do not pass the end of zone Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 30/32] fs/drop_caches.c: avoid softlockups in drop_pagecache_sb() Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 31/32] autofs: drop dentry reference only when it is never used Sasha Levin
2019-02-23 21:09 ` [PATCH AUTOSEL 4.9 32/32] autofs: fix error return in autofs_fill_super() Sasha Levin

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