diff options
| author | Jiri Olsa <jolsa@kernel.org> | 2025-07-20 13:21:18 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-08-21 20:09:20 +0200 |
| commit | 91440ff4cafad4c86322a612e523f7f021a493e7 (patch) | |
| tree | 7654dd4e419031dd8ca2a2e7e4c4d907ed74802f /kernel/events | |
| parent | 18a111256a0b4fedfe47101f084441a84d7e357a (diff) | |
uprobes/x86: Add mapping for optimized uprobe trampolines
Adding support to add special mapping for user space trampoline with
following functions:
uprobe_trampoline_get - find or add uprobe_trampoline
uprobe_trampoline_put - remove or destroy uprobe_trampoline
The user space trampoline is exported as arch specific user space special
mapping through tramp_mapping, which is initialized in following changes
with new uprobe syscall.
The uprobe trampoline needs to be callable/reachable from the probed address,
so while searching for available address we use is_reachable_by_call function
to decide if the uprobe trampoline is callable from the probe address.
All uprobe_trampoline objects are stored in uprobes_state object and are
cleaned up when the process mm_struct goes down. Adding new arch hooks
for that, because this change is x86_64 specific.
Locking is provided by callers in following changes.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20250720112133.244369-9-jolsa@kernel.org
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/uprobes.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index da2b3d0deab6..2cd7a4c6f303 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1801,6 +1801,14 @@ static struct xol_area *get_xol_area(void) return area; } +void __weak arch_uprobe_clear_state(struct mm_struct *mm) +{ +} + +void __weak arch_uprobe_init_state(struct mm_struct *mm) +{ +} + /* * uprobe_clear_state - Free the area allocated for slots. */ @@ -1812,6 +1820,8 @@ void uprobe_clear_state(struct mm_struct *mm) delayed_uprobe_remove(NULL, mm); mutex_unlock(&delayed_uprobe_lock); + arch_uprobe_clear_state(mm); + if (!area) return; |