[PATCHv4 03/13] uprobes/x86: Allow to copy uprobe trampolines on fork

[Jiri Olsa]

When we do fork or clone without CLONE_VM the new process won't
have uprobe trampoline vma objects and at the same time it will
have optimized code calling that trampoline and crash.

Fixing this by allowing vma uprobe trampoline objects to be copied
on fork to the new process.

Fixes: ba2bfc97b462 ("uprobes/x86: Add support to optimize uprobes")
Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 arch/x86/kernel/uprobes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index 733655bc610e..c8af41ed681a 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -697,7 +697,7 @@ static struct vm_area_struct *get_uprobe_trampoline(struct 
mm_struct *mm, unsign
                return ERR_PTR(vaddr);
 
        return _install_special_mapping(mm, vaddr, PAGE_SIZE,
-                               
VM_READ|VM_EXEC|VM_MAYEXEC|VM_MAYREAD|VM_DONTCOPY|VM_IO,
+                               VM_READ|VM_EXEC|VM_MAYEXEC|VM_MAYREAD|VM_IO,
                                &tramp_mapping);
 }
 
-- 
2.54.0