[PATCH 3/5] riscv: shstk: Use the new common vm_mmap_shadow_stack() helper
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2026-02-24 17:58:17
Also in:
linux-mm, linux-riscv, lkml
Subsystem:
risc-v architecture, the rest · Maintainers:
Paul Walmsley, Palmer Dabbelt, Albert Ou, Linus Torvalds
Replace part of the allocate_shadow_stack() content with a call to vm_mmap_shadow_stack(). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Paul Walmsley <pjw@kernel.org> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Deepak Gupta <redacted> --- arch/riscv/kernel/usercfi.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-)
diff --git a/arch/riscv/kernel/usercfi.c b/arch/riscv/kernel/usercfi.c
index 1adba746f164..7e57f54dc5b2 100644
--- a/arch/riscv/kernel/usercfi.c
+++ b/arch/riscv/kernel/usercfi.c@@ -230,17 +230,7 @@ int restore_user_shstk(struct task_struct *tsk, unsigned long shstk_ptr) static unsigned long allocate_shadow_stack(unsigned long addr, unsigned long size, unsigned long token_offset, bool set_tok) { - int flags = MAP_ANONYMOUS | MAP_PRIVATE; - struct mm_struct *mm = current->mm; - unsigned long populate; - - if (addr) - flags |= MAP_FIXED_NOREPLACE; - - mmap_write_lock(mm); - addr = do_mmap(NULL, addr, size, PROT_READ, flags, - VM_SHADOW_STACK | VM_WRITE, 0, &populate, NULL); - mmap_write_unlock(mm); + addr = vm_mmap_shadow_stack(addr, size, 0); if (!set_tok || IS_ERR_VALUE(addr)) goto out;