In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix re-attachment branch in bpf_tracing_prog_attach
The following case can cause a crash due to missing attach_btf:
In the end we have:
prog->aux->dst_trampoline == NULL
tgt_prog == NULL (because we did not provide target_fd to link_create)
prog->aux->attach_btf == NULL (the program was loaded with attach_prog_fd=X)
the program was loaded for tgt_prog but we have no way to find out which one
BUG: kernel NULL pointer dereference, address: 0000000000000058
Call Trace:
<TASK>
? __die+0x20/0x70
? page_fault_oops+0x15b/0x430
? fixup_exception+0x22/0x330
? exc_page_fault+0x6f/0x170
? asm_exc_page_fault+0x22/0x30
? bpf_tracing_prog_attach+0x279/0x560
? btf_obj_id+0x5/0x10
bpf_tracing_prog_attach+0x439/0x560
__sys_bpf+0x1cf4/0x2de0
__x64_sys_bpf+0x1c/0x30
do_syscall_64+0x41/0xf0
entry_SYSCALL_64_after_hwframe+0x6e/0x76
Return -EINVAL in this situation.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/bpf/syscall.c"
],
"versions": [
{
"version": "f3a95075549e",
"lessThan": "a7b98aa10f89",
"status": "affected",
"versionType": "git"
},
{
"version": "f3a95075549e",
"lessThan": "6cc9c0af0aa0",
"status": "affected",
"versionType": "git"
},
{
"version": "f3a95075549e",
"lessThan": "8c8bcd45e9b1",
"status": "affected",
"versionType": "git"
},
{
"version": "f3a95075549e",
"lessThan": "50ae82f080cf",
"status": "affected",
"versionType": "git"
},
{
"version": "f3a95075549e",
"lessThan": "715d82ba636c",
"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/syscall.c"
],
"versions": [
{
"version": "5.13",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.13",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.148",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.75",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.14",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.7.2",
"lessThanOrEqual": "6.7.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.8",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/50ae82f080cf87e84828f066c31723b781d68f5b
git.kernel.org/stable/c/6cc9c0af0aa06f781fa515a1734b1a4239dfd2c0
git.kernel.org/stable/c/715d82ba636cb3629a6e18a33bb9dbe53f9936ee
git.kernel.org/stable/c/8c8bcd45e9b10eef12321f08d2e5be33d615509c
git.kernel.org/stable/c/a7b98aa10f895e2569403896f2d19b73b6c95653