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Hengqi Chen 918a399501 riscv, bpf: Sign extend struct ops return values properly [ Upstream commit `fd2e081289` ] The ns_bpf_qdisc selftest triggers a kernel panic: Unable to handle kernel paging request at virtual address ffffffffa38dbf58 Current test_progs pgtable: 4K pagesize, 57-bit VAs, pgdp=0x00000001109cc000 [ffffffffa38dbf58] pgd=000000011fffd801, p4d=000000011fffd401, pud=000000011fffd001, pmd=0000000000000000 Oops [#1] Modules linked in: bpf_testmod(OE) xt_conntrack nls_iso8859_1 [...] [last unloaded: bpf_testmod(OE)] CPU: 1 UID: 0 PID: 23584 Comm: test_progs Tainted: G W OE 6.17.0-rc1-g2465bb83e0b4 #1 NONE Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2024.01+dfsg-1ubuntu5.1 01/01/2024 epc : __qdisc_run+0x82/0x6f0 ra : __qdisc_run+0x6e/0x6f0 epc : ffffffff80bd5c7a ra : ffffffff80bd5c66 sp : ff2000000eecb550 gp : ffffffff82472098 tp : ff60000096895940 t0 : ffffffff8001f180 t1 : ffffffff801e1664 t2 : 0000000000000000 s0 : ff2000000eecb5d0 s1 : ff60000093a6a600 a0 : ffffffffa38dbee8 a1 : 0000000000000001 a2 : ff2000000eecb510 a3 : 0000000000000001 a4 : 0000000000000000 a5 : 0000000000000010 a6 : 0000000000000000 a7 : 0000000000735049 s2 : ffffffffa38dbee8 s3 : 0000000000000040 s4 : ff6000008bcda000 s5 : 0000000000000008 s6 : ff60000093a6a680 s7 : ff60000093a6a6f0 s8 : ff60000093a6a6ac s9 : ff60000093140000 s10: 0000000000000000 s11: ff2000000eecb9d0 t3 : 0000000000000000 t4 : 0000000000ff0000 t5 : 0000000000000000 t6 : ff60000093a6a8b6 status: 0000000200000120 badaddr: ffffffffa38dbf58 cause: 000000000000000d [<ffffffff80bd5c7a>] __qdisc_run+0x82/0x6f0 [<ffffffff80b6fe58>] __dev_queue_xmit+0x4c0/0x1128 [<ffffffff80b80ae0>] neigh_resolve_output+0xd0/0x170 [<ffffffff80d2daf6>] ip6_finish_output2+0x226/0x6c8 [<ffffffff80d31254>] ip6_finish_output+0x10c/0x2a0 [<ffffffff80d31446>] ip6_output+0x5e/0x178 [<ffffffff80d2e232>] ip6_xmit+0x29a/0x608 [<ffffffff80d6f4c6>] inet6_csk_xmit+0xe6/0x140 [<ffffffff80c985e4>] __tcp_transmit_skb+0x45c/0xaa8 [<ffffffff80c995fe>] tcp_connect+0x9ce/0xd10 [<ffffffff80d66524>] tcp_v6_connect+0x4ac/0x5e8 [<ffffffff80cc19b8>] __inet_stream_connect+0xd8/0x318 [<ffffffff80cc1c36>] inet_stream_connect+0x3e/0x68 [<ffffffff80b42b20>] __sys_connect_file+0x50/0x88 [<ffffffff80b42bee>] __sys_connect+0x96/0xc8 [<ffffffff80b42c40>] __riscv_sys_connect+0x20/0x30 [<ffffffff80e5bcae>] do_trap_ecall_u+0x256/0x378 [<ffffffff80e69af2>] handle_exception+0x14a/0x156 Code: 892a 0363 1205 489c 8bc1 c7e5 2d03 084a 2703 080a (2783) 0709 ---[ end trace 0000000000000000 ]--- The bpf_fifo_dequeue prog returns a skb which is a pointer. The pointer is treated as a 32bit value and sign extend to 64bit in epilogue. This behavior is right for most bpf prog types but wrong for struct ops which requires RISC-V ABI. So let's sign extend struct ops return values according to the function model and RISC-V ABI([0]). [0]: https://riscv.org/wp-content/uploads/2024/12/riscv-calling.pdf Fixes: `25ad10658d` ("riscv, bpf: Adapt bpf trampoline to optimized riscv ftrace framework") Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Tested-by: Pu Lehui <pulehui@huawei.com> Reviewed-by: Pu Lehui <pulehui@huawei.com> Link: https://lore.kernel.org/bpf/20250908012448.1695-1-hengqi.chen@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-10-15 12:03:33 +02:00
arch
block
certs
crypto	crypto: rng - Ensure set_ent is always present	2025-10-12 13:01:57 +02:00
Documentation
drivers
fs
include	ACPICA: Apply ACPI_NONSTRING	2025-10-15 12:03:33 +02:00
init
io_uring	io_uring-6.17-20250919	2025-09-19 12:10:49 -07:00
ipc	vfs-6.17-rc1.mmap_prepare	2025-07-28 13:43:25 -07:00
kernel
lib
LICENSES
mm
net	net/9p: fix double req put in p9_fd_cancelled	2025-10-12 13:01:57 +02:00
rust
samples
scripts
security	lsm: CONFIG_LSM can depend on CONFIG_SECURITY	2025-10-15 12:03:17 +02:00
sound	ASoC: qcom: audioreach: fix potential null pointer dereference	2025-10-06 11:20:06 +02:00
tools
usr	usr/include: openrisc: don't HDRTEST bpf_perf_event.h	2025-05-12 15:03:17 +09:00
virt
.clang-format
.clippy.toml
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.editorconfig	.editorconfig: remove trim_trailing_whitespace option	2024-06-13 16:47:52 +02:00
.get_maintainer.ignore
.gitattributes
.gitignore	gitignore: allow .pylintrc to be tracked	2025-07-02 17:10:04 -06:00
.mailmap	7 hotfixes. 4 are cc:stable and the remainder address post-6.16 issues or	2025-09-28 09:32:00 -07:00
.pylintrc	docs: add a .pylintrc file with sys path for docs scripts	2025-04-09 12:10:33 -06:00
.rustfmt.toml
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: retire Boris from TLS maintainers	2025-08-26 17:36:01 -07:00
Kbuild
Kconfig
MAINTAINERS
Makefile	Linux 6.17.2	2025-10-12 13:01:58 +02:00
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