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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2022-09-06 17:12:59 +0200
committerAlexei Starovoitov <ast@kernel.org>2022-09-07 20:03:44 +0200
commit15baa55ff5b00b81bcd9874b89cb8e0b0daaa13d (patch)
treede84b7fd33c63411952073682cdb27bcd3ac9829 /net/bpf
parentbpf: split btf_check_subprog_arg_match in two (diff)
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bpf/verifier: allow all functions to read user provided context
When a function was trying to access data from context in a syscall eBPF program, the verifier was rejecting the call unless it was accessing the first element. This is because the syscall context is not known at compile time, and so we need to check this when actually accessing it. Check for the valid memory access if there is no convert_ctx callback, and allow such situation to happen. Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Link: https://lore.kernel.org/r/20220906151303.2780789-4-benjamin.tissoires@redhat.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/bpf')
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