linux-kernel - [PATCH V2 04/10] kasan: Don't use kasan shadow pointer in generic functions

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Message-Id: <1440577578-15813-5-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
Date:	Wed, 26 Aug 2015 13:56:12 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
	ryabinin.a.a@...il.com
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH V2 04/10] kasan: Don't use kasan shadow pointer in generic functions

We can't use generic functions like print_hex_dump to access kasan
shadow region. This require us to setup another kasan shadow region
for the address passed (kasan shadow address). Most architecture won't
be able to do that. Hence remove dumping kasan shadow region dump. If
we really want to do this we will have to have a kasan internal implemen
tation of print_hex_dump for which we will disable address sanitizer
operation.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
 mm/kasan/report.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index d19d01823a68..79fbc5d14bd2 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -170,12 +170,6 @@ static void print_shadow_for_address(const void *addr)
 		snprintf(buffer, sizeof(buffer),
 			(i == 0) ? ">%p: " : " %p: ", kaddr);
 
-		kasan_disable_current();
-		print_hex_dump(KERN_ERR, buffer,
-			DUMP_PREFIX_NONE, SHADOW_BYTES_PER_ROW, 1,
-			shadow_row, SHADOW_BYTES_PER_ROW, 0);
-		kasan_enable_current();
-
 		if (row_is_guilty(shadow_row, shadow))
 			pr_err("%*c\n",
 				shadow_pointer_offset(shadow_row, shadow),
-- 
2.5.0

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