diff options
Diffstat (limited to 'arch/riscv/kernel/signal.c')
| -rw-r--r-- | arch/riscv/kernel/signal.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c index c46f3dc039bb..f117641c1c49 100644 --- a/arch/riscv/kernel/signal.c +++ b/arch/riscv/kernel/signal.c @@ -23,6 +23,8 @@ #include <asm/csr.h> #include <asm/cacheflush.h> +unsigned long signal_minsigstksz __ro_after_init; + extern u32 __user_rt_sigreturn[2]; static size_t riscv_v_sc_size __ro_after_init; @@ -197,7 +199,7 @@ static long restore_sigcontext(struct pt_regs *regs, return err; } -static size_t get_rt_frame_size(void) +static size_t get_rt_frame_size(bool cal_all) { struct rt_sigframe __user *frame; size_t frame_size; @@ -205,8 +207,10 @@ static size_t get_rt_frame_size(void) frame_size = sizeof(*frame); - if (has_vector() && riscv_v_vstate_query(task_pt_regs(current))) - total_context_size += riscv_v_sc_size; + if (has_vector()) { + if (cal_all || riscv_v_vstate_query(task_pt_regs(current))) + total_context_size += riscv_v_sc_size; + } /* * Preserved a __riscv_ctx_hdr for END signal context header if an * extension uses __riscv_extra_ext_header @@ -226,7 +230,7 @@ SYSCALL_DEFINE0(rt_sigreturn) struct rt_sigframe __user *frame; struct task_struct *task; sigset_t set; - size_t frame_size = get_rt_frame_size(); + size_t frame_size = get_rt_frame_size(false); /* Always make any pending restarted system calls return -EINTR */ current->restart_block.fn = do_no_restart_syscall; @@ -323,7 +327,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct rt_sigframe __user *frame; long err = 0; unsigned long __maybe_unused addr; - size_t frame_size = get_rt_frame_size(); + size_t frame_size = get_rt_frame_size(false); frame = get_sigframe(ksig, regs, frame_size); if (!access_ok(frame, frame_size)) @@ -465,4 +469,10 @@ void __init init_rt_signal_env(void) { riscv_v_sc_size = sizeof(struct __riscv_ctx_hdr) + sizeof(struct __sc_riscv_v_state) + riscv_v_vsize; + /* + * Determine the stack space required for guaranteed signal delivery. + * The signal_minsigstksz will be populated into the AT_MINSIGSTKSZ entry + * in the auxiliary array at process startup. + */ + signal_minsigstksz = get_rt_frame_size(true); } |