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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/arc/lib/memcpy-700.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/arc/lib/memcpy-700.S')
| -rw-r--r-- | arch/arc/lib/memcpy-700.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/arc/lib/memcpy-700.S b/arch/arc/lib/memcpy-700.S new file mode 100644 index 000000000..f2e239e21 --- /dev/null +++ b/arch/arc/lib/memcpy-700.S @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + */ + +#include <linux/linkage.h> + +ENTRY_CFI(memcpy) + or r3,r0,r1 + asl_s r3,r3,30 + mov_s r5,r0 + brls.d r2,r3,.Lcopy_bytewise + sub.f r3,r2,1 + ld_s r12,[r1,0] + asr.f lp_count,r3,3 + bbit0.d r3,2,.Lnox4 + bmsk_s r2,r2,1 + st.ab r12,[r5,4] + ld.a r12,[r1,4] +.Lnox4: + lppnz .Lendloop + ld_s r3,[r1,4] + st.ab r12,[r5,4] + ld.a r12,[r1,8] + st.ab r3,[r5,4] +.Lendloop: + breq r2,0,.Last_store + ld r3,[r5,0] +#ifdef __LITTLE_ENDIAN__ + add3 r2,-1,r2 + ; uses long immediate + xor_s r12,r12,r3 + bmsk r12,r12,r2 + xor_s r12,r12,r3 +#else /* BIG ENDIAN */ + sub3 r2,31,r2 + ; uses long immediate + xor_s r3,r3,r12 + bmsk r3,r3,r2 + xor_s r12,r12,r3 +#endif /* ENDIAN */ +.Last_store: + j_s.d [blink] + st r12,[r5,0] + + .balign 4 +.Lcopy_bytewise: + jcs [blink] + ldb_s r12,[r1,0] + lsr.f lp_count,r3 + bhs_s .Lnox1 + stb.ab r12,[r5,1] + ldb.a r12,[r1,1] +.Lnox1: + lppnz .Lendbloop + ldb_s r3,[r1,1] + stb.ab r12,[r5,1] + ldb.a r12,[r1,2] + stb.ab r3,[r5,1] +.Lendbloop: + j_s.d [blink] + stb r12,[r5,0] +END_CFI(memcpy) |