[PATCHv2 02/11] 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 the trampolines.

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 2be6707e3320..37faf038be33 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -702,7 +702,7 @@ static struct uprobe_trampoline 
*create_uprobe_trampoline(unsigned long vaddr)
 
        tramp->vaddr = vaddr;
        vma = _install_special_mapping(mm, tramp->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);
        if (IS_ERR(vma)) {
                kfree(tramp);
-- 
2.53.0