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a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=wP3pNCr1ah4A:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=46_LeYnHjSuwuQiKq7EA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjE1MDEzOSBTYWx0ZWRfXyxemREksMyjL g3eB0zt5rWclAROTH18OsZ1lFRIIxM3lntX9aRvRcaYn5kxFDHvPUDKqUStEMPu7IV3rUD0DpmC ZyJs08I7jpSJivqN4aWOEHKtqywWWgcWTJ9WDGvc7zyMfzT5M92yahlQf+Y/Cw8EGxIl2fnMjJI ECK7bN0OTdRfBqdwQq04FpxqLC8VIapHSJ8jXldJgvaUqbz3im8WLl5e+00I5XLWFCX+7KYYX/N O/knExzIMontPuH81SwD/cZtydEiErsR79mwqvo92UFhV3wVKLWK9TjTsR5ypYU68bRoCIBl2VJ La8A7px/Ej8foezg56xhBKugP1oR2xK5TGki2CdmVCqIaTMQyUMdlxgGT/IQBVDNMCrr8BPkLLS TZdG7BpR7I7/dPqCLtUnq+bjR5yHcg== On 15/12/2025 09:38, bot+bpf-ci@kernel.org wrote: >> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c >> index b136572e889a..8835aee6ee84 100644 >> --- a/tools/lib/bpf/btf.c >> +++ b/tools/lib/bpf/btf.c > > [ ... ] > >> @@ -214,7 +232,7 @@ static int btf_add_type_idx_entry(struct btf *btf, __u32 type_off) >> return 0; >> } >> >> -static void btf_bswap_hdr(struct btf_header *h) >> +static void btf_bswap_hdr(struct btf_header *h, __u32 hdr_len) >> { >> h->magic = bswap_16(h->magic); >> h->hdr_len = bswap_32(h->hdr_len); >> @@ -222,54 +240,87 @@ static void btf_bswap_hdr(struct btf_header *h) >> h->type_len = bswap_32(h->type_len); >> h->str_off = bswap_32(h->str_off); >> h->str_len = bswap_32(h->str_len); >> + /* May be operating on raw data with hdr_len that does not include below fields */ >> + if (hdr_len >= sizeof(struct btf_header)) { >> + h->kind_layout_off = bswap_32(h->kind_layout_off); >> + h->kind_layout_len = bswap_32(h->kind_layout_len); >> + } >> } >> >> static int btf_parse_hdr(struct btf *btf) >> { >> - struct btf_header *hdr = btf->hdr; >> + struct btf_header *hdr = btf->raw_data; >> + __u32 hdr_len = hdr->hdr_len; >> __u32 meta_left; >> >> - if (btf->raw_size < sizeof(struct btf_header)) { >> + if (btf->raw_size < offsetofend(struct btf_header, str_len)) { >> pr_debug("BTF header not found\n"); >> return -EINVAL; >> } >> >> if (hdr->magic == bswap_16(BTF_MAGIC)) { >> btf->swapped_endian = true; >> - if (bswap_32(hdr->hdr_len) != sizeof(struct btf_header)) { >> + hdr_len = bswap_32(hdr->hdr_len); >> + if (hdr_len < offsetofend(struct btf_header, str_len)) { >> pr_warn("Can't load BTF with non-native endianness due to unsupported header length %u\n", >> - bswap_32(hdr->hdr_len)); >> + hdr_len); >> return -ENOTSUP; >> } >> - btf_bswap_hdr(hdr); >> + btf_bswap_hdr(hdr, hdr_len); > ^^^ > > Does this result in hdr->hdr_len being double-swapped? In the swapped > endianness path, hdr_len is set to bswap_32(hdr->hdr_len) and then > btf_bswap_hdr() is called, which does h->hdr_len = bswap_32(h->hdr_len) > again. This means hdr->hdr_len in the structure ends up with its original > (incorrect) endianness while the local hdr_len variable has the correct > swapped value. > > Later code then copies the incorrectly-swapped header into btf->hdr: > I don't think this is right. We do hdr_len = bswap_32(hdr->hdr_len); and this will _return_ a bswapped value, but does not bswap hdr->hdr_len itself. When we later bswap the header via btf_bswap_hdr(), we end up in a state where both hdr_len and hdr->hdr_len will have the same (swapped once) value. If we had hdr->hdr_len = bswap_32(hdr->hdr_len); ...the concern would be valid. So AI wasn't far off here. >> } >> >> - if (btf->raw_size < hdr->hdr_len) { >> + if (btf->raw_size < hdr_len) { >> pr_debug("BTF header len %u larger than data size %u\n", >> - hdr->hdr_len, btf->raw_size); >> + hdr_len, btf->raw_size); >> return -EINVAL; >> } > > [ ... ] > >> + /* At this point, we have basic header information, so allocate btf->hdr */ >> + btf->hdr = calloc(1, sizeof(struct btf_header)); >> + if (!btf->hdr) { >> + pr_debug("BTF header allocation failed\n"); >> + return -ENOMEM; >> + } >> + memcpy(btf->hdr, hdr, min((size_t)hdr_len, sizeof(struct btf_header))); > ^^^ > > The memcpy copies from hdr, which contains the double-swapped (therefore > incorrect) hdr_len field. So btf->hdr->hdr_len will have the wrong > endianness when btf_parse_hdr() returns. This affects subsequent pointer > arithmetic like: > > btf->types_data = btf->raw_data + btf->hdr->hdr_len + btf->hdr->type_off > > causing types_data to point to the wrong location when loading BTF with > non-native endianness. > AI has followed the chain of reasoning based on the non-existent byte-swap issue above, so this isn't a concern either I believe.