4.19-stable review patch. If anyone has any objections, please let me know.
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From: Jisheng Zhang jszhang@kernel.org
commit 5c178472af247c7b50f962495bb7462ba453b9fb upstream.
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: fbe934d69eb7 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/Kconfig | 5 +++++ 1 file changed, 5 insertions(+)
--- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -84,6 +84,11 @@ config GENERIC_CSUM config GENERIC_HWEIGHT def_bool y
+config ILLEGAL_POINTER_VALUE + hex + default 0 if 32BIT + default 0xdead000000000000 if 64BIT + config PGTABLE_LEVELS int default 3 if 64BIT