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ARM: 9430/1: entry: Do a dummy read from VMAP shadow

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When switching task, in addition to a dummy read from the new
VMAP stack, also do a dummy read from the VMAP stack's
corresponding KASAN shadow memory to sync things up in
the new MM context.

Cc: stable@vger.kernel.org
Fixes: a1c510d0ad ("ARM: implement support for vmap'ed stacks")
Link: https://lore.kernel.org/linux-arm-kernel/a1a1d062-f3a2-4d05-9836-3b098de9db6d@foss.st.com/
Reported-by: Clement LE GOFFIC <clement.legoffic@foss.st.com>
Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Linus Walleij
2024-10-23 13:04:44 +01:00
committed by Russell King (Oracle)
parent d6e6a74d4c
commit 44e9a3bb76
1 changed files with 8 additions and 0 deletions
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8
arch/arm/kernel/entry-armv.S
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@@ -25,6 +25,7 @@
#include <asm/tls.h>
#include <asm/system_info.h>
#include <asm/uaccess-asm.h>
#include <asm/kasan_def.h>
#include "entry-header.S"
#include <asm/probes.h>
@@ -561,6 +562,13 @@ ENTRY(__switch_to)
@ entries covering the vmalloc region.
@
ldr r2, [ip]
#ifdef CONFIG_KASAN_VMALLOC
@ Also dummy read from the KASAN shadow memory for the new stack if we
@ are using KASAN
mov_l r2, KASAN_SHADOW_OFFSET
add r2, r2, ip, lsr #KASAN_SHADOW_SCALE_SHIFT
ldr r2, [r2]
#endif
#endif
@ When CONFIG_THREAD_INFO_IN_TASK=n, the update of SP itself is what