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riscv: define ILLEGAL_POINTER_VALUE for 64bit

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This is used in poison.h for poison pointer offset. Based on current
SV39, SV48 and SV57 vm layout, 0xdead000000000000 is a proper value
that is not mappable, this can avoid potentially turning an oops to
an expolit.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Fixes: fbe934d69e ("RISC-V: Build Infrastructure")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240705170210.3236-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Jisheng Zhang 2024-07-06 01:02:10 +08:00 • committed by Palmer Dabbelt
parent d6a1928134
commit 5c178472af
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arch/riscv/Kconfig
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@ -320,6 +320,11 @@ config GENERIC_HWEIGHT
config FIX_EARLYCON_MEM
def_bool MMU
config ILLEGAL_POINTER_VALUE
hex
default 0 if 32BIT
default 0xdead000000000000 if 64BIT
config PGTABLE_LEVELS
int
default 5 if 64BIT