Description
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Fix off-by-one error in build_prologue() Vincent reported that running BPF progs with tailcalls on LoongArch causes kernel hard lockup. Debugging the issues shows that the JITed image missing a jirl instruction at the end of the epilogue. There are two passes in JIT compiling, the first pass set the flags and the second pass generates JIT code based on those flags. With BPF progs mixing bpf2bpf and tailcalls, build_prologue() generates N insns in the first pass and then generates N+1 insns in the second pass. This makes epilogue_offset off by one and we will jump to some unexpected insn and cause lockup. Fix this by inserting a nop insn.
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 < b3ffad2f02db4aace6799fe0049508b8925eae45affected5dc615520c4dfb358245680f1904bad61116648e to < 205a2182c51ffebaef54d643e3745e720cded08baffected5dc615520c4dfb358245680f1904bad61116648e to < c74d95a5679741ef428974ab788f5b0758dc78aeaffected5dc615520c4dfb358245680f1904bad61116648e to < 48b904de2408af5f936f0e03f48dfcddeab58aa0affected5dc615520c4dfb358245680f1904bad61116648e to < 7e2586991e36663c9bc48c828b83eab180ad30a9affected
Linux Linux
Default version status: affected
6.1affected0 to < 6.1unaffected6.6.87 to ≤ 6.6.*unaffected6.12.23 to ≤ 6.12.*unaffected6.13.11 to ≤ 6.13.*unaffected6.14.2 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/b3ffad2f02db4aace6799fe0049508b8925eae45 ↗
- https://git.kernel.org/stable/c/205a2182c51ffebaef54d643e3745e720cded08b ↗
- https://git.kernel.org/stable/c/c74d95a5679741ef428974ab788f5b0758dc78ae ↗
- https://git.kernel.org/stable/c/48b904de2408af5f936f0e03f48dfcddeab58aa0 ↗
- https://git.kernel.org/stable/c/7e2586991e36663c9bc48c828b83eab180ad30a9 ↗