diff options
| author | Andy Chiu <andy.chiu@sifive.com> | 2023-06-05 11:07:13 +0000 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-06-08 07:16:48 -0700 |
| commit | 76e22fdc2c2658ab595cdda7368d43d2dc16f3f4 (patch) | |
| tree | 712e2ae53164e8deed7f2247ba2758f32c0c7388 /arch/riscv/kernel/signal.c | |
| parent | e92f469b0771e6db9688a58c0e34a8342da6a6bc (diff) | |
riscv: signal: validate altstack to reflect Vector
Some extensions, such as Vector, dynamically change footprint on a
signal frame, so MINSIGSTKSZ is no longer accurate. For example, an
RV64V implementation with vlen = 512 may occupy 2K + 40 + 12 Bytes of a
signal frame with the upcoming support. And processes that do not
execute any vector instructions do not need to reserve the extra
sigframe. So we need a way to guard the allocation size of the sigframe
at process runtime according to current status of V.
Thus, provide the function sigaltstack_size_valid() to validate its size
based on current allocation status of supported extensions.
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Tested-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Link: https://lore.kernel.org/r/20230605110724.21391-17-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/kernel/signal.c')
| -rw-r--r-- | arch/riscv/kernel/signal.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c index f117641c1c49..180d951d3624 100644 --- a/arch/riscv/kernel/signal.c +++ b/arch/riscv/kernel/signal.c @@ -476,3 +476,10 @@ void __init init_rt_signal_env(void) */ signal_minsigstksz = get_rt_frame_size(true); } + +#ifdef CONFIG_DYNAMIC_SIGFRAME +bool sigaltstack_size_valid(size_t ss_size) +{ + return ss_size > get_rt_frame_size(false); +} +#endif /* CONFIG_DYNAMIC_SIGFRAME */ |