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From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	 naveen.n.rao@linux.vnet.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH 10/12] powerpc/entry32: Blacklist exception entry points for kprobe.
Date: Sun, 29 Mar 2020 09:41:10 +0000 (UTC)	[thread overview]
Message-ID: <aea027844b12fcbc29ea78d26c5848a6794d1688.1585474724.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <dff05b59a161434a546010507000816750073f28.1585474724.git.christophe.leroy@c-s.fr>

kprobe does not handle events happening in real mode.

As exception entry points are running with MMU disabled,
blacklist them.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 arch/powerpc/kernel/entry_32.S | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 94f78c03cb79..9a1a45d6038a 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -51,6 +51,7 @@ mcheck_transfer_to_handler:
 	mfspr	r0,SPRN_DSRR1
 	stw	r0,_DSRR1(r11)
 	/* fall through */
+_ASM_NOKPROBE_SYMBOL(mcheck_transfer_to_handler)
 
 	.globl	debug_transfer_to_handler
 debug_transfer_to_handler:
@@ -59,6 +60,7 @@ debug_transfer_to_handler:
 	mfspr	r0,SPRN_CSRR1
 	stw	r0,_CSRR1(r11)
 	/* fall through */
+_ASM_NOKPROBE_SYMBOL(debug_transfer_to_handler)
 
 	.globl	crit_transfer_to_handler
 crit_transfer_to_handler:
@@ -94,6 +96,7 @@ crit_transfer_to_handler:
 	rlwinm	r0,r1,0,0,(31 - THREAD_SHIFT)
 	stw	r0,KSP_LIMIT(r8)
 	/* fall through */
+_ASM_NOKPROBE_SYMBOL(crit_transfer_to_handler)
 #endif
 
 #ifdef CONFIG_40x
@@ -115,6 +118,7 @@ crit_transfer_to_handler:
 	rlwinm	r0,r1,0,0,(31 - THREAD_SHIFT)
 	stw	r0,KSP_LIMIT(r8)
 	/* fall through */
+_ASM_NOKPROBE_SYMBOL(crit_transfer_to_handler)
 #endif
 
 /*
@@ -127,6 +131,7 @@ crit_transfer_to_handler:
 	.globl	transfer_to_handler_full
 transfer_to_handler_full:
 	SAVE_NVGPRS(r11)
+_ASM_NOKPROBE_SYMBOL(transfer_to_handler_full)
 	/* fall through */
 
 	.globl	transfer_to_handler
@@ -286,6 +291,8 @@ reenable_mmu:
 	lwz	r2, GPR2(r11)
 	b	fast_exception_return
 #endif
+_ASM_NOKPROBE_SYMBOL(transfer_to_handler)
+_ASM_NOKPROBE_SYMBOL(transfer_to_handler_cont)
 
 #ifndef CONFIG_VMAP_STACK
 /*
-- 
2.25.0


  parent reply	other threads:[~2020-03-29  9:58 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-29  9:41 [PATCH 01/12] powerpc/52xx: Blacklist functions running with MMU disabled for kprobe Christophe Leroy
2020-03-29  9:41 ` [PATCH 02/12] powerpc/82xx: Blacklist pq2_restart() " Christophe Leroy
2020-03-29  9:41 ` [PATCH 03/12] powerpc/83xx: Blacklist mpc83xx_deep_resume() " Christophe Leroy
2020-03-29  9:41 ` [PATCH 04/12] powerpc/powermac: Blacklist functions running with MMU disabled " Christophe Leroy
2020-03-29  9:41 ` [PATCH 05/12] powerpc/mem: Blacklist flush_dcache_icache_phys() " Christophe Leroy
2020-03-29  9:41 ` [PATCH 06/12] powerpc/32s: Make local symbols non visible in hash_low Christophe Leroy
2020-03-30 17:06   ` Naveen N. Rao
2020-03-30 17:22     ` Christophe Leroy
2020-03-30 17:49       ` Naveen N. Rao
2020-03-29  9:41 ` [PATCH 07/12] powerpc/32s: Blacklist functions running with MMU disabled for kprobe Christophe Leroy
2020-03-29  9:41 ` [PATCH 08/12] powerpc/rtas: Remove machine_check_in_rtas() Christophe Leroy
2020-03-29  9:41 ` [PATCH 09/12] powerpc/32: Blacklist functions running with MMU disabled for kprobe Christophe Leroy
2020-03-29  9:41 ` Christophe Leroy [this message]
2020-03-30 17:08   ` [PATCH 10/12] powerpc/entry32: Blacklist exception entry points " Naveen N. Rao
2020-03-30 18:33     ` Christophe Leroy
2020-03-31  5:51       ` Christophe Leroy
2020-03-31  6:17         ` Naveen N. Rao
2020-03-31  6:28           ` Christophe Leroy
2020-03-31  6:44             ` Naveen N. Rao
2020-03-31  6:13       ` Naveen N. Rao
2020-03-29  9:41 ` [PATCH 11/12] powerpc/entry32: Blacklist syscall exit " Christophe Leroy
2020-03-29  9:41 ` [PATCH 12/12] powerpc/entry32: Blacklist exception " Christophe Leroy
2020-03-30 17:13 ` [PATCH 01/12] powerpc/52xx: Blacklist functions running with MMU disabled " Naveen N. Rao

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