bpf: arm64: Fix panic due to missing BTI at indirect jump targets #6429
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When BTI is enabled, the indirect jump selftest triggers BTI exception: 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 __sys_bpf+0x4d8/0x5c8 __arm64_sys_bpf+0x88/0xa8 invoke_syscall+0x80/0x220 el0_svc_common+0x160/0x1d0 do_el0_svc+0x54/0x70 el0_svc+0x54/0x188 el0t_64_sync_handler+0x84/0x130 el0t_64_sync+0x198/0x1a0 This happens because no BTI instruction is generated by the JIT for indirect jump targets. Fix it by emitting BTI instruction for every possible indirect jump targets when BTI is enabled. The targets are identified by traversing all instruction arrays used by the BPF program, since indirect jump targets can only be read from instruction arrays. Fixes: f4a66cf ("bpf: arm64: Add support for indirect jumps") Signed-off-by: Xu Kuohai <[email protected]>
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Pull request for series with
subject: bpf: arm64: Fix panic due to missing BTI at indirect jump targets
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1028290