{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2022-49228","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-02-26T01:49:39.293Z","datePublished":"2025-02-26T01:55:56.682Z","dateUpdated":"2025-05-04T08:32:53.680Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T08:32:53.680Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a btf decl_tag bug when tagging a function\n\nsyzbot reported a btf decl_tag bug with stack trace below:\n\n  general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  CPU: 0 PID: 3592 Comm: syz-executor914 Not tainted 5.16.0-syzkaller-11424-gb7892f7d5cb2 #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n  RIP: 0010:btf_type_vlen include/linux/btf.h:231 [inline]\n  RIP: 0010:btf_decl_tag_resolve+0x83e/0xaa0 kernel/bpf/btf.c:3910\n  ...\n  Call Trace:\n   <TASK>\n   btf_resolve+0x251/0x1020 kernel/bpf/btf.c:4198\n   btf_check_all_types kernel/bpf/btf.c:4239 [inline]\n   btf_parse_type_sec kernel/bpf/btf.c:4280 [inline]\n   btf_parse kernel/bpf/btf.c:4513 [inline]\n   btf_new_fd+0x19fe/0x2370 kernel/bpf/btf.c:6047\n   bpf_btf_load kernel/bpf/syscall.c:4039 [inline]\n   __sys_bpf+0x1cbb/0x5970 kernel/bpf/syscall.c:4679\n   __do_sys_bpf kernel/bpf/syscall.c:4738 [inline]\n   __se_sys_bpf kernel/bpf/syscall.c:4736 [inline]\n   __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4736\n   do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n   do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe kasan error is triggered with an illegal BTF like below:\n   type 0: void\n   type 1: int\n   type 2: decl_tag to func type 3\n   type 3: func to func_proto type 8\nThe total number of types is 4 and the type 3 is illegal\nsince its func_proto type is out of range.\n\nCurrently, the target type of decl_tag can be struct/union, var or func.\nBoth struct/union and var implemented their own 'resolve' callback functions\nand hence handled properly in kernel.\nBut func type doesn't have 'resolve' callback function. When\nbtf_decl_tag_resolve() tries to check func type, it tries to get\nvlen of its func_proto type, which triggered the above kasan error.\n\nTo fix the issue, btf_decl_tag_resolve() needs to do btf_func_check()\nbefore trying to accessing func_proto type.\nIn the current implementation, func type is checked with\nbtf_func_check() in the main checking function btf_check_all_types().\nTo fix the above kasan issue, let us implement 'resolve' callback\nfunc type properly. The 'resolve' callback will be also called\nin btf_check_all_types() for func types."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/btf.c"],"versions":[{"version":"b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef","lessThan":"a3bcd2110c087bc62e90fddd4a93237b049d6e68","status":"affected","versionType":"git"},{"version":"b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef","lessThan":"796d5666f6422ddadc938fb888044fcc16f2dbe3","status":"affected","versionType":"git"},{"version":"b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef","lessThan":"d7e7b42f4f956f2c68ad8cda87d750093dbba737","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/btf.c"],"versions":[{"version":"5.16","status":"affected"},{"version":"0","lessThan":"5.16","status":"unaffected","versionType":"semver"},{"version":"5.16.19","lessThanOrEqual":"5.16.*","status":"unaffected","versionType":"semver"},{"version":"5.17.2","lessThanOrEqual":"5.17.*","status":"unaffected","versionType":"semver"},{"version":"5.18","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.16.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.17.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a3bcd2110c087bc62e90fddd4a93237b049d6e68"},{"url":"https://git.kernel.org/stable/c/796d5666f6422ddadc938fb888044fcc16f2dbe3"},{"url":"https://git.kernel.org/stable/c/d7e7b42f4f956f2c68ad8cda87d750093dbba737"}],"title":"bpf: Fix a btf decl_tag bug when tagging a function","x_generator":{"engine":"bippy-1.2.0"}}}}