Jisheng Zhang 7e1864332f 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: 31da94c25a ("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
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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	2022-11-29 18:16:55 -08:00
kernel	riscv: fix race when vmap stack overflow	2022-11-29 18:16:55 -08:00
lib	riscv: Add support for function error injection	2021-01-14 15:09:09 -08:00
mm	riscv: Introduce structure that group all variables regarding kernel mapping	2021-07-05 18:04:00 -07:00
net	riscv: bpf: Avoid breaking W^X	2021-04-26 08:25:14 -07:00
Kbuild	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00
Kconfig	riscv: add VMAP_STACK overflow detection	2021-07-06 12:11:38 -07:00
Kconfig.debug	RISC-V: Remove EARLY_PRINTK support	2018-12-17 10:23:46 -08:00
Kconfig.erratas	riscv: enable SiFive errata CIP-453 and CIP-1200 Kconfig only if CONFIG_64BIT=y	2021-05-06 09:40:13 -07:00
Kconfig.socs	RISC-V Patches for the 5.13 Merge Window, Part 1	2021-05-06 09:24:18 -07:00
Makefile	RISC-V: enable XIP	2021-04-26 08:31:28 -07:00