bpf: add __weak hook for allocating executable memory
By default, BPF uses module_alloc() to allocate executable memory, but this is not necessary on all arches and potentially undesirable on some of them. So break out the module_alloc() and module_memfree() calls into __weak functions to allow them to be overridden in arch code. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>
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@ -634,6 +634,16 @@ bool __weak arch_bpf_jit_check_func(const struct bpf_prog *prog)
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EXPORT_SYMBOL_GPL(arch_bpf_jit_check_func);
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#endif
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void *__weak bpf_jit_alloc_exec(unsigned long size)
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{
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return module_alloc(size);
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}
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void __weak bpf_jit_free_exec(void *addr)
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{
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module_memfree(addr);
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}
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struct bpf_binary_header *
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bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
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unsigned int alignment,
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@ -651,7 +661,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
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if (bpf_jit_charge_modmem(pages))
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return NULL;
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hdr = module_alloc(size);
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hdr = bpf_jit_alloc_exec(size);
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if (!hdr) {
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bpf_jit_uncharge_modmem(pages);
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return NULL;
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@ -676,7 +686,7 @@ void bpf_jit_binary_free(struct bpf_binary_header *hdr)
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{
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u32 pages = hdr->pages;
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module_memfree(hdr);
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bpf_jit_free_exec(hdr);
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bpf_jit_uncharge_modmem(pages);
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}
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