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uprobes/x86: Allow to copy uprobe trampolines on fork

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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: ba2bfc97b4 ("uprobes/x86: Add support to optimize uprobes")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Link: https://patch.msgid.link/20260703114917.238144-5-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2026-07-03 13:49:08 +02:00 committed by Peter Zijlstra
parent 07c308eb2b
commit d9a48e77f6
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/uprobes.c
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@ -701,7 +701,7 @@ static struct vm_area_struct *get_uprobe_trampoline(struct mm_struct *mm, unsign
*new_mapping = true;
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);
}