** Description changed: [ Impact ] Previously applied patches to the generic kernel are making jammy:linux- riscv-6.8 FTBFS because of missing declaration of some functions in arch/riscv/net/bpf_jit.h. Those previous patches were applied in bulk as part of upstream stable patchset 2026-01-26. See https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2139072 The following commit, fixing CVE-2025-40079, from kernel 6.12, uses functions that were not yet defined in 6.8: - riscv, bpf: Sign extend struct ops return values properly (fd2e08128944a7679e753f920e9eda72057e427c) + riscv, bpf: Sign extend struct ops return values properly (fd2e08128944a7679e753f920e9eda72057e427c) Error log: /build/jammy/arch/riscv/net/bpf_jit_comp64.c:582:17: error: implicit declaration of function 'emit_sextb'; did you mean 'emit_sub'? [-Werror=implicit-function-declaration] /build/jammy/arch/riscv/net/bpf_jit_comp64.c:585:17: error: implicit declaration of function 'emit_sexth'; did you mean 'emit_zext_32'? [-Werror=implicit-function-declaration] /build/jammy/arch/riscv/net/bpf_jit_comp64.c:588:17: error: implicit declaration of function 'emit_sextw'; did you mean 'emit_subw'? [-Werror=implicit-function-declaration] ... and more missing functions [ Fix ] - Cherry picked 3 missing commits from upstream: + Cherry picked 5 missing commits from upstream: - e33758f7493c9ad8cf6960bcf7c70f5761f3acfb "riscv, bpf: Unify 32-bit sign-extension to emit_sextw" + - 914c7a5ff18a225f7df254ae3433574f3d47b711 "riscv, bpf: Unify 32-bit zero-extension to emit_zextw" + - 647b93f65daa128d9a0e4aac744a5fcf5f58b2d2 "riscv, bpf: Add necessary Zbb instructions" - 5090b339eeb3417baa940d690923e630e077d8f8 "riscv, bpf: Add rv_ext_enabled macro for runtime detection extentsion" - - 647b93f65daa128d9a0e4aac744a5fcf5f58b2d2 "riscv, bpf: Add necessary Zbb instructions" + - 06a33d024838414432b6c0f51f994e7f1695b74f "riscv, bpf: Optimize bswap insns with Zbb support" Those commits add definitions for the missing functions emit_sextX and others. [ Test Case ] Kernel build succeeded.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2142235 Title: linux-riscv-6.8 is FTBFS because of missing patches To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-riscv-6.8/+bug/2142235/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
