GHSA-989V-M4F5-C899
Vulnerability from github – Published: 2024-05-21 18:31 – Updated: 2024-05-21 18:31In the Linux kernel, the following vulnerability has been resolved:
samples/bpf: syscall_tp_user: Fix array out-of-bound access
Commit 06744f24696e ("samples/bpf: Add openat2() enter/exit tracepoint to syscall_tp sample") added two more eBPF programs to support the openat2() syscall. However, it did not increase the size of the array that holds the corresponding bpf_links. This leads to an out-of-bound access on that array in the bpf_object__for_each_program loop and could corrupt other variables on the stack. On our testing QEMU, it corrupts the map1_fds array and causes the sample to fail:
# ./syscall_tp prog #0: map ids 4 5 verify map:4 val: 5 map_lookup failed: Bad file descriptor
Dynamically allocate the array based on the number of programs reported by libbpf to prevent similar inconsistencies in the future
{
"affected": [],
"aliases": [
"CVE-2023-52793"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T16:15:17Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsamples/bpf: syscall_tp_user: Fix array out-of-bound access\n\nCommit 06744f24696e (\"samples/bpf: Add openat2() enter/exit tracepoint\nto syscall_tp sample\") added two more eBPF programs to support the\nopenat2() syscall. However, it did not increase the size of the array\nthat holds the corresponding bpf_links. This leads to an out-of-bound\naccess on that array in the bpf_object__for_each_program loop and could\ncorrupt other variables on the stack. On our testing QEMU, it corrupts\nthe map1_fds array and causes the sample to fail:\n\n # ./syscall_tp\n prog #0: map ids 4 5\n verify map:4 val: 5\n map_lookup failed: Bad file descriptor\n\nDynamically allocate the array based on the number of programs reported\nby libbpf to prevent similar inconsistencies in the future",
"id": "GHSA-989v-m4f5-c899",
"modified": "2024-05-21T18:31:21Z",
"published": "2024-05-21T18:31:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52793"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/61576b7a0f28f924da06bead92a39a6d9aa2404a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9220c3ef6fefbf18f24aeedb1142a642b3de0596"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/de4825a444560f8cb78b03dda3ba873fab88bc4f"
}
],
"schema_version": "1.4.0",
"severity": []
}
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