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| author | Yiyang Chen <chenyy23@mails.tsinghua.edu.cn> | 2026-07-29 15:18:28 +0000 |
|---|---|---|
| committer | Eduard Zingerman <eddyz87@gmail.com> | 2026-07-31 12:45:21 -0700 |
| commit | a4c6f804b44c5c790269b25e0e61cf4e9f117c86 (patch) | |
| tree | 4dacbc340a4b5f8769e3d26d55782ae9e4bf0aef /tools/perf/scripts/python/stackcollapse.py | |
| parent | a15970d916b39acc7c60a0a99c27a6e378690aa9 (diff) | |
bpf: Preserve pointer state for commuted arithmetic
When scalar += pointer is handled in adjust_ptr_min_max_vals(), the
destination register inherits the pointer state from the source pointer.
Copying only selected fields is fragile because pointer provenance is
tracked by several bpf_reg_state fields.
Use the caller's temporary offset register to preserve the scalar operand
while replacing the destination with the full pointer state. This preserves
the frame number for PTR_TO_STACK registers and keeps parent identity
fields consistent.
Fixes: f4d7e40a5b71 ("bpf: introduce function calls (verification)")
Signed-off-by: Yiyang Chen <chenyy23@mails.tsinghua.edu.cn>
Tested-by: Daniel Wade <danjwade95@gmail.com>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Link: https://patch.msgid.link/20260729-c3-035-public-bpf-v4-v4-2-8ee297e2346b@mails.tsinghua.edu.cn
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions