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linux/arch/arm64/net
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Xu Kuohai f6606a44bc bpf, arm64: Emit BTI for indirect jump target 
On CPUs that support BTI, the indirect jump selftest triggers a kernel
panic because there is no BTI instructions at the indirect jump targets.

Fix it by emitting a BTI instruction for each indirect jump target.

For reference, below is a sample panic log.

Internal error: Oops - BTI: 0000000036000003 [#1]  SMP
...
Call trace:
 bpf_prog_2e5f1c71c13ac3e0_big_jump_table+0x54/0xf8 (P)
 bpf_prog_run_pin_on_cpu+0x140/0x468
 bpf_prog_test_run_syscall+0x280/0x3b8
 bpf_prog_test_run+0x22c/0x2c0

Fixes: f4a66cf1cb ("bpf: arm64: Add support for indirect jumps")
Reviewed-by: Anton Protopopov <a.s.protopopov@gmail.com> # v8
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com> # v12
Acked-by: Leon Hwang <leon.hwang@linux.dev>
Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Link: https://lore.kernel.org/r/20260416064341.151802-6-xukuohai@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
History 2026-04-16 07:03:41 -07:00
..
bpf_jit.h bpf, arm64: Use ORR-based MOV for general-purpose registers 2026-03-03 08:43:10 -08:00
bpf_jit_comp.c bpf, arm64: Emit BTI for indirect jump target 2026-04-16 07:03:41 -07:00
bpf_timed_may_goto.S bpf, arm64: Add JIT support for timed may_goto 2025-08-27 17:16:22 -07:00
Makefile bpf, arm64: Add JIT support for timed may_goto 2025-08-27 17:16:22 -07:00