This is a note to let you know that I've just added the patch titled powerpc/bpf: Fix use of user_pt_regs in uapi to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: powerpc-bpf-fix-use-of-user_pt_regs-in-uapi.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From b21bd5a4b130f8370861478d2880985daace5913 Mon Sep 17 00:00:00 2001 From: "Naveen N. Rao" <naveen.n.rao@xxxxxxxxxxxxxxxxxx> Date: Tue, 28 Jun 2022 00:41:19 +0530 Subject: powerpc/bpf: Fix use of user_pt_regs in uapi MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx> commit b21bd5a4b130f8370861478d2880985daace5913 upstream. Trying to build a .c file that includes <linux/bpf_perf_event.h>: $ cat test_bpf_headers.c #include <linux/bpf_perf_event.h> throws the below error: /usr/include/linux/bpf_perf_event.h:14:28: error: field ‘regs’ has incomplete type 14 | bpf_user_pt_regs_t regs; | ^~~~ This is because we typedef bpf_user_pt_regs_t to 'struct user_pt_regs' in arch/powerpc/include/uaps/asm/bpf_perf_event.h, but 'struct user_pt_regs' is not exposed to userspace. Powerpc has both pt_regs and user_pt_regs structures. However, unlike arm64 and s390, we expose user_pt_regs to userspace as just 'pt_regs'. As such, we should typedef bpf_user_pt_regs_t to 'struct pt_regs' for userspace. Within the kernel though, we want to typedef bpf_user_pt_regs_t to 'struct user_pt_regs'. Remove arch/powerpc/include/uapi/asm/bpf_perf_event.h so that the uapi/asm-generic version of the header is exposed to userspace. Introduce arch/powerpc/include/asm/bpf_perf_event.h so that we can typedef bpf_user_pt_regs_t to 'struct user_pt_regs' for use within the kernel. Note that this was not showing up with the bpf selftest build since tools/include/uapi/asm/bpf_perf_event.h didn't include the powerpc variant. Fixes: a6460b03f945ee ("powerpc/bpf: Fix broken uapi for BPF_PROG_TYPE_PERF_EVENT") Cc: stable@xxxxxxxxxxxxxxx # v4.20+ Signed-off-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx> [mpe: Use typical naming for header include guard] Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20220627191119.142867-1-naveen.n.rao@xxxxxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/powerpc/include/asm/bpf_perf_event.h | 9 +++++++++ arch/powerpc/include/uapi/asm/bpf_perf_event.h | 9 --------- 2 files changed, 9 insertions(+), 9 deletions(-) create mode 100644 arch/powerpc/include/asm/bpf_perf_event.h delete mode 100644 arch/powerpc/include/uapi/asm/bpf_perf_event.h --- /dev/null +++ b/arch/powerpc/include/asm/bpf_perf_event.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_BPF_PERF_EVENT_H +#define _ASM_POWERPC_BPF_PERF_EVENT_H + +#include <asm/ptrace.h> + +typedef struct user_pt_regs bpf_user_pt_regs_t; + +#endif /* _ASM_POWERPC_BPF_PERF_EVENT_H */ --- a/arch/powerpc/include/uapi/asm/bpf_perf_event.h +++ /dev/null @@ -1,9 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ -#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__ -#define _UAPI__ASM_BPF_PERF_EVENT_H__ - -#include <asm/ptrace.h> - -typedef struct user_pt_regs bpf_user_pt_regs_t; - -#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */ Patches currently in stable-queue which might be from naveen.n.rao@xxxxxxxxxxxxxxxxxx are queue-5.4/powerpc-bpf-fix-use-of-user_pt_regs-in-uapi.patch