bpf: arm64: fix BPF_ST into arena memory #6259
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The arm64 JIT supports BPF_ST with BPF_PROBE_MEM32 (arena) by using the tmp2 register to hold the dst + arena_vm_base value and using tmp2 as the new dst register. But this is broken because in case is_lsi_offset() returns false the tmp2 will be clobbered by emit_a64_mov_i(1, tmp2, off, ctx); and hence the emitted store instruction will be of the form: strb w10, [x11, x11] Fix this by using the third temporary register to hold the dst + arena_vm_base. Fixes: 339af57 ("bpf: Add arm64 JIT support for PROBE_MEM32 pseudo instructions.") Signed-off-by: Puranjay Mohan <[email protected]>
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Upstream branch: 5701d5a |
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Pull request for series with
subject: bpf: arm64: fix BPF_ST into arena memory
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1017709