mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-29 13:53:33 +00:00
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>
This commit is contained in:
parent
e92f469b07
commit
76e22fdc2c
1 changed files with 7 additions and 0 deletions
|
@ -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 */
|
||||
|
|
Loading…
Reference in a new issue