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| author | Eduard Zingerman <eddyz87@gmail.com> | 2026-09-04 17:05:56 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-09-04 18:17:30 -0700 |
| commit | 506ada89629ec7059b96ecfb0dc7d33ece0103ca (patch) | |
| tree | 0b07297409b68d2333fb4f0eae7f3b072eb68d4c /arch/hexagon/lib/modsi3.S | |
| download | linux-stable-506ada89629ec7059b96ecfb0dc7d33ece0103ca.tar.gz linux-stable-506ada89629ec7059b96ecfb0dc7d33ece0103ca.zip | |
bpf: mark a NULL kfunc argument precisegrafted
check_kfunc_arg() allows bpf_register_is_null() for nullable arguments
w/o marking the underlying scalar register precise. Hence a checkpoint
created on such a path would prune against arbitrary scalar value.
Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)")
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'arch/hexagon/lib/modsi3.S')
| -rw-r--r-- | arch/hexagon/lib/modsi3.S | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/hexagon/lib/modsi3.S b/arch/hexagon/lib/modsi3.S new file mode 100644 index 000000000..9ea1c86ef --- /dev/null +++ b/arch/hexagon/lib/modsi3.S @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2021, The Linux Foundation. All rights reserved. + */ + +#include <linux/linkage.h> + +SYM_FUNC_START(__hexagon_modsi3) + { + p2 = cmp.ge(r0,#0) + r2 = abs(r0) + r1 = abs(r1) + } + { + r3 = cl0(r2) + r4 = cl0(r1) + p0 = cmp.gtu(r1,r2) + } + { + r3 = sub(r4,r3) + if (p0) jumpr r31 + } + { + p1 = cmp.eq(r3,#0) + loop0(1f,r3) + r0 = r2 + r2 = lsl(r1,r3) + } + .falign +1: + { + p0 = cmp.gtu(r2,r0) + if (!p0.new) r0 = sub(r0,r2) + r2 = lsr(r2,#1) + if (p1) r1 = #0 + }:endloop0 + { + p0 = cmp.gtu(r2,r0) + if (!p0.new) r0 = sub(r0,r1) + if (p2) jumpr r31 + } + { + r0 = neg(r0) + jumpr r31 + } +SYM_FUNC_END(__hexagon_modsi3) |