linux

iv/linux

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riscv: fix race when vmap stack overflow

Currently, when detecting vmap stack overflow, riscv firstly switches
to the so called shadow stack, then use this shadow stack to call the
get_overflow_stack() to get the overflow stack. However, there's
a race here if two or more harts use the same shadow stack at the same
time.

To solve this race, we introduce spin_shadow_stack atomic var, which
will be swap between its own address and 0 in atomic way, when the
var is set, it means the shadow_stack is being used; when the var
is cleared, it means the shadow_stack isn't being used.

Fixes: 31da94c25aea ("riscv: add VMAP_STACK overflow detection")
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Suggested-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20221030124517.2370-1-jszhang@kernel.org
[Palmer: Add AQ to the swap, and also some comments.]
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

2022-11-29 18:16:55 -08:00

boot

RISC-V Patches for the 5.13 Merge Window, Part 1

2021-05-06 09:24:18 -07:00

configs

RISC-V: Enable Microchip PolarFire ICICLE SoC

2021-04-26 08:31:32 -07:00

errata

riscv: sifive: Apply errata "cip-1200" patch

2021-04-26 08:24:58 -07:00

include

riscv: fix race when vmap stack overflow