CVE-2022-49228 (GCVE-0-2022-49228)
Vulnerability from cvelistv5
Published
2025-02-26 01:55
Modified
2025-05-04 08:32
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix a btf decl_tag bug when tagging a function
syzbot reported a btf decl_tag bug with stack trace below:
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 3592 Comm: syz-executor914 Not tainted 5.16.0-syzkaller-11424-gb7892f7d5cb2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:btf_type_vlen include/linux/btf.h:231 [inline]
RIP: 0010:btf_decl_tag_resolve+0x83e/0xaa0 kernel/bpf/btf.c:3910
...
Call Trace:
<TASK>
btf_resolve+0x251/0x1020 kernel/bpf/btf.c:4198
btf_check_all_types kernel/bpf/btf.c:4239 [inline]
btf_parse_type_sec kernel/bpf/btf.c:4280 [inline]
btf_parse kernel/bpf/btf.c:4513 [inline]
btf_new_fd+0x19fe/0x2370 kernel/bpf/btf.c:6047
bpf_btf_load kernel/bpf/syscall.c:4039 [inline]
__sys_bpf+0x1cbb/0x5970 kernel/bpf/syscall.c:4679
__do_sys_bpf kernel/bpf/syscall.c:4738 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4736 [inline]
__x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4736
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
The kasan error is triggered with an illegal BTF like below:
type 0: void
type 1: int
type 2: decl_tag to func type 3
type 3: func to func_proto type 8
The total number of types is 4 and the type 3 is illegal
since its func_proto type is out of range.
Currently, the target type of decl_tag can be struct/union, var or func.
Both struct/union and var implemented their own 'resolve' callback functions
and hence handled properly in kernel.
But func type doesn't have 'resolve' callback function. When
btf_decl_tag_resolve() tries to check func type, it tries to get
vlen of its func_proto type, which triggered the above kasan error.
To fix the issue, btf_decl_tag_resolve() needs to do btf_func_check()
before trying to accessing func_proto type.
In the current implementation, func type is checked with
btf_func_check() in the main checking function btf_check_all_types().
To fix the above kasan issue, let us implement 'resolve' callback
func type properly. The 'resolve' callback will be also called
in btf_check_all_types() for func types.
References
Impacted products
{
"containers": {
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"versions": [
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"version": "0",
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{
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"status": "unaffected",
"version": "5.16.19",
"versionType": "semver"
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{
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"version": "5.17.2",
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{
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"versionType": "original_commit_for_fix"
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}
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"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 \u003cTASK\u003e\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 \u0027resolve\u0027 callback functions\nand hence handled properly in kernel.\nBut func type doesn\u0027t have \u0027resolve\u0027 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 \u0027resolve\u0027 callback\nfunc type properly. The \u0027resolve\u0027 callback will be also called\nin btf_check_all_types() for func types."
}
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"dateUpdated": "2025-05-04T08:32:53.680Z",
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{
"url": "https://git.kernel.org/stable/c/796d5666f6422ddadc938fb888044fcc16f2dbe3"
},
{
"url": "https://git.kernel.org/stable/c/d7e7b42f4f956f2c68ad8cda87d750093dbba737"
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"title": "bpf: Fix a btf decl_tag bug when tagging a function",
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"cveId": "CVE-2022-49228",
"datePublished": "2025-02-26T01:55:56.682Z",
"dateReserved": "2025-02-26T01:49:39.293Z",
"dateUpdated": "2025-05-04T08:32:53.680Z",
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