CVE-2025-38723 (GCVE-0-2025-38723)
Vulnerability from cvelistv5
Published
2025-09-04 15:33
Modified
2025-09-04 15:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Fix jump offset calculation in tailcall The extra pass of bpf_int_jit_compile() skips JIT context initialization which essentially skips offset calculation leaving out_offset = -1, so the jmp_offset in emit_bpf_tail_call is calculated by "#define jmp_offset (out_offset - (cur_offset))" is a negative number, which is wrong. The final generated assembly are as follow. 54: bgeu $a2, $t1, -8 # 0x0000004c 58: addi.d $a6, $s5, -1 5c: bltz $a6, -16 # 0x0000004c 60: alsl.d $t2, $a2, $a1, 0x3 64: ld.d $t2, $t2, 264 68: beq $t2, $zero, -28 # 0x0000004c Before apply this patch, the follow test case will reveal soft lock issues. cd tools/testing/selftests/bpf/ ./test_progs --allow=tailcalls/tailcall_bpf2bpf_1 dmesg: watchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/17c010fe45def335fe03a0718935416b04c7f349
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a782fa32e644aa9fbae6c8488f3e61221ac96e1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9262e3e04621558e875eb5afb5e726b648cd5949
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f83d469e16bb1f75991ca67c56786fb2aaa42bea
Impacted products
Vendor Product Version
Linux Linux Version: 5dc615520c4dfb358245680f1904bad61116648e
Version: 5dc615520c4dfb358245680f1904bad61116648e
Version: 5dc615520c4dfb358245680f1904bad61116648e
Version: 5dc615520c4dfb358245680f1904bad61116648e
Version: 5dc615520c4dfb358245680f1904bad61116648e
Version: 5dc615520c4dfb358245680f1904bad61116648e
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{
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          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Fix jump offset calculation in tailcall\n\nThe extra pass of bpf_int_jit_compile() skips JIT context initialization\nwhich essentially skips offset calculation leaving out_offset = -1, so\nthe jmp_offset in emit_bpf_tail_call is calculated by\n\n\"#define jmp_offset (out_offset - (cur_offset))\"\n\nis a negative number, which is wrong. The final generated assembly are\nas follow.\n\n54:\tbgeu        \t$a2, $t1, -8\t    # 0x0000004c\n58:\taddi.d      \t$a6, $s5, -1\n5c:\tbltz        \t$a6, -16\t    # 0x0000004c\n60:\talsl.d      \t$t2, $a2, $a1, 0x3\n64:\tld.d        \t$t2, $t2, 264\n68:\tbeq         \t$t2, $zero, -28\t    # 0x0000004c\n\nBefore apply this patch, the follow test case will reveal soft lock issues.\n\ncd tools/testing/selftests/bpf/\n./test_progs --allow=tailcalls/tailcall_bpf2bpf_1\n\ndmesg:\nwatchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]"
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    "dateReserved": "2025-04-16T04:51:24.033Z",
    "dateUpdated": "2025-09-04T15:33:16.547Z",
    "state": "PUBLISHED"
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  }
}


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