Description
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]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
5dc615520c4dfb358245680f1904bad61116648e to < 1a782fa32e644aa9fbae6c8488f3e61221ac96e1affected5dc615520c4dfb358245680f1904bad61116648e to < 17c010fe45def335fe03a0718935416b04c7f349affected5dc615520c4dfb358245680f1904bad61116648e to < f83d469e16bb1f75991ca67c56786fb2aaa42beaaffected5dc615520c4dfb358245680f1904bad61116648e to < f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94faffected5dc615520c4dfb358245680f1904bad61116648e to < 9262e3e04621558e875eb5afb5e726b648cd5949affected5dc615520c4dfb358245680f1904bad61116648e to < cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3affected
Linux Linux
Default version status: affected
6.1affected0 to < 6.1unaffected6.1.149 to ≤ 6.1.*unaffected6.6.103 to ≤ 6.6.*unaffected6.12.43 to ≤ 6.12.*unaffected6.15.11 to ≤ 6.15.*unaffected6.16.2 to ≤ 6.16.*unaffected6.17 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/1a782fa32e644aa9fbae6c8488f3e61221ac96e1 ↗
- https://git.kernel.org/stable/c/17c010fe45def335fe03a0718935416b04c7f349 ↗
- https://git.kernel.org/stable/c/f83d469e16bb1f75991ca67c56786fb2aaa42bea ↗
- https://git.kernel.org/stable/c/f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f ↗
- https://git.kernel.org/stable/c/9262e3e04621558e875eb5afb5e726b648cd5949 ↗
- https://git.kernel.org/stable/c/cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html ↗