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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: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v2 07/12] powerpc/32s: Blacklist functions running with MMU disabled for kprobe
Date: Tue, 31 Mar 2020 16:03:42 +0000 (UTC)	[thread overview]
Message-ID: <dabed523c1b8955dd425152ce260b390053e727a.1585670437.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <1ae02b6637b87fc5aaa1d5012c3e2cb30e62b4a3.1585670437.git.christophe.leroy@c-s.fr>

kprobe does not handle events happening in real mode, all
functions running with MMU disabled have to be blacklisted.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
 arch/powerpc/mm/book3s32/hash_low.S | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/mm/book3s32/hash_low.S b/arch/powerpc/mm/book3s32/hash_low.S
index 2afa3fa2012d..f5f836477009 100644
--- a/arch/powerpc/mm/book3s32/hash_low.S
+++ b/arch/powerpc/mm/book3s32/hash_low.S
@@ -163,6 +163,7 @@ _GLOBAL(hash_page)
 	stw	r0, (mmu_hash_lock - PAGE_OFFSET)@l(r8)
 	blr
 #endif /* CONFIG_SMP */
+_ASM_NOKPROBE_SYMBOL(hash_page)
 
 /*
  * Add an entry for a particular page to the hash table.
@@ -267,6 +268,7 @@ _GLOBAL(add_hash_page)
 	lwz	r0,4(r1)
 	mtlr	r0
 	blr
+_ASM_NOKPROBE_SYMBOL(add_hash_page)
 
 /*
  * This routine adds a hardware PTE to the hash table.
@@ -472,6 +474,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)
 
 	sync		/* make sure pte updates get to memory */
 	blr
+_ASM_NOKPROBE_SYMBOL(create_hpte)
 
 	.section .bss
 	.align	2
@@ -628,6 +631,7 @@ _GLOBAL(flush_hash_pages)
 	isync
 	blr
 EXPORT_SYMBOL(flush_hash_pages)
+_ASM_NOKPROBE_SYMBOL(flush_hash_pages)
 
 /*
  * Flush an entry from the TLB
@@ -665,6 +669,7 @@ _GLOBAL(_tlbie)
 	sync
 #endif /* CONFIG_SMP */
 	blr
+_ASM_NOKPROBE_SYMBOL(_tlbie)
 
 /*
  * Flush the entire TLB. 603/603e only
@@ -706,3 +711,4 @@ _GLOBAL(_tlbia)
 	isync
 #endif /* CONFIG_SMP */
 	blr
+_ASM_NOKPROBE_SYMBOL(_tlbia)
-- 
2.25.0


WARNING: multiple messages have this Message-ID (diff)
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 v2 07/12] powerpc/32s: Blacklist functions running with MMU disabled for kprobe
Date: Tue, 31 Mar 2020 16:03:42 +0000 (UTC)	[thread overview]
Message-ID: <dabed523c1b8955dd425152ce260b390053e727a.1585670437.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <1ae02b6637b87fc5aaa1d5012c3e2cb30e62b4a3.1585670437.git.christophe.leroy@c-s.fr>

kprobe does not handle events happening in real mode, all
functions running with MMU disabled have to be blacklisted.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
 arch/powerpc/mm/book3s32/hash_low.S | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/mm/book3s32/hash_low.S b/arch/powerpc/mm/book3s32/hash_low.S
index 2afa3fa2012d..f5f836477009 100644
--- a/arch/powerpc/mm/book3s32/hash_low.S
+++ b/arch/powerpc/mm/book3s32/hash_low.S
@@ -163,6 +163,7 @@ _GLOBAL(hash_page)
 	stw	r0, (mmu_hash_lock - PAGE_OFFSET)@l(r8)
 	blr
 #endif /* CONFIG_SMP */
+_ASM_NOKPROBE_SYMBOL(hash_page)
 
 /*
  * Add an entry for a particular page to the hash table.
@@ -267,6 +268,7 @@ _GLOBAL(add_hash_page)
 	lwz	r0,4(r1)
 	mtlr	r0
 	blr
+_ASM_NOKPROBE_SYMBOL(add_hash_page)
 
 /*
  * This routine adds a hardware PTE to the hash table.
@@ -472,6 +474,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)
 
 	sync		/* make sure pte updates get to memory */
 	blr
+_ASM_NOKPROBE_SYMBOL(create_hpte)
 
 	.section .bss
 	.align	2
@@ -628,6 +631,7 @@ _GLOBAL(flush_hash_pages)
 	isync
 	blr
 EXPORT_SYMBOL(flush_hash_pages)
+_ASM_NOKPROBE_SYMBOL(flush_hash_pages)
 
 /*
  * Flush an entry from the TLB
@@ -665,6 +669,7 @@ _GLOBAL(_tlbie)
 	sync
 #endif /* CONFIG_SMP */
 	blr
+_ASM_NOKPROBE_SYMBOL(_tlbie)
 
 /*
  * Flush the entire TLB. 603/603e only
@@ -706,3 +711,4 @@ _GLOBAL(_tlbia)
 	isync
 #endif /* CONFIG_SMP */
 	blr
+_ASM_NOKPROBE_SYMBOL(_tlbia)
-- 
2.25.0


  parent reply	other threads:[~2020-03-31 16:04 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-31 16:03 [PATCH v2 01/12] powerpc/52xx: Blacklist functions running with MMU disabled for kprobe Christophe Leroy
2020-03-31 16:03 ` Christophe Leroy
2020-03-31 16:03 ` [PATCH v2 02/12] powerpc/82xx: Blacklist pq2_restart() " Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-03-31 16:03 ` [PATCH v2 03/12] powerpc/83xx: Blacklist mpc83xx_deep_resume() " Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-03-31 16:03 ` [PATCH v2 04/12] powerpc/powermac: Blacklist functions running with MMU disabled " Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-03-31 16:03 ` [PATCH v2 05/12] powerpc/mem: Blacklist flush_dcache_icache_phys() " Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-03-31 16:03 ` [PATCH v2 06/12] powerpc/32s: Make local symbols non visible in hash_low Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-03-31 16:03 ` Christophe Leroy [this message]
2020-03-31 16:03   ` [PATCH v2 07/12] powerpc/32s: Blacklist functions running with MMU disabled for kprobe Christophe Leroy
2020-03-31 16:03 ` [PATCH v2 08/12] powerpc/rtas: Remove machine_check_in_rtas() Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-03-31 16:03 ` [PATCH v2 09/12] powerpc/32: Blacklist functions running with MMU disabled for kprobe Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-03-31 16:03 ` [PATCH v2 10/12] powerpc/entry32: Blacklist exception entry points " Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-03-31 17:05   ` Naveen N. Rao
2020-03-31 17:05     ` Naveen N. Rao
2020-03-31 16:03 ` [PATCH v2 11/12] powerpc/entry32: Blacklist syscall exit " Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-03-31 16:03 ` [PATCH v2 12/12] powerpc/entry32: Blacklist exception " Christophe Leroy
2020-03-31 16:03   ` Christophe Leroy
2020-06-09  5:28 ` [PATCH v2 01/12] powerpc/52xx: Blacklist functions running with MMU disabled " Michael Ellerman

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