/* * common eBPF ELF operations. * * Copyright (C) 2013-2015 Alexei Starovoitov * Copyright (C) 2015 Wang Nan * Copyright (C) 2015 Huawei Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License (not later!) * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program; if not, see */ #include #include #include #include #include #include "bpf.h" /* * When building perf, unistd.h is overrided. __NR_bpf is * required to be defined explicitly. */ #ifndef __NR_bpf # if defined(__i386__) # define __NR_bpf 357 # elif defined(__x86_64__) # define __NR_bpf 321 # elif defined(__aarch64__) # define __NR_bpf 280 # else # error __NR_bpf not defined. libbpf does not support your arch. # endif #endif static __u64 ptr_to_u64(void *ptr) { return (__u64) (unsigned long) ptr; } static int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr, unsigned int size) { return syscall(__NR_bpf, cmd, attr, size); } int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size, int max_entries, __u32 map_flags) { union bpf_attr attr; memset(&attr, '\0', sizeof(attr)); attr.map_type = map_type; attr.key_size = key_size; attr.value_size = value_size; attr.max_entries = max_entries; attr.map_flags = map_flags; return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); } int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns, size_t insns_cnt, char *license, __u32 kern_version, char *log_buf, size_t log_buf_sz) { int fd; union bpf_attr attr; bzero(&attr, sizeof(attr)); attr.prog_type = type; attr.insn_cnt = (__u32)insns_cnt; attr.insns = ptr_to_u64(insns); attr.license = ptr_to_u64(license); attr.log_buf = ptr_to_u64(NULL); attr.log_size = 0; attr.log_level = 0; attr.kern_version = kern_version; fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); if (fd >= 0 || !log_buf || !log_buf_sz) return fd; /* Try again with log */ attr.log_buf = ptr_to_u64(log_buf); attr.log_size = log_buf_sz; attr.log_level = 1; log_buf[0] = 0; return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); } int bpf_map_update_elem(int fd, void *key, void *value, __u64 flags) { union bpf_attr attr; bzero(&attr, sizeof(attr)); attr.map_fd = fd; attr.key = ptr_to_u64(key); attr.value = ptr_to_u64(value); attr.flags = flags; return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); } int bpf_map_lookup_elem(int fd, void *key, void *value) { union bpf_attr attr; bzero(&attr, sizeof(attr)); attr.map_fd = fd; attr.key = ptr_to_u64(key); attr.value = ptr_to_u64(value); return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); } int bpf_map_delete_elem(int fd, void *key) { union bpf_attr attr; bzero(&attr, sizeof(attr)); attr.map_fd = fd; attr.key = ptr_to_u64(key); return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); } int bpf_map_get_next_key(int fd, void *key, void *next_key) { union bpf_attr attr; bzero(&attr, sizeof(attr)); attr.map_fd = fd; attr.key = ptr_to_u64(key); attr.next_key = ptr_to_u64(next_key); return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); } int bpf_obj_pin(int fd, const char *pathname) { union bpf_attr attr; bzero(&attr, sizeof(attr)); attr.pathname = ptr_to_u64((void *)pathname); attr.bpf_fd = fd; return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); } int bpf_obj_get(const char *pathname) { union bpf_attr attr; bzero(&attr, sizeof(attr)); attr.pathname = ptr_to_u64((void *)pathname); return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); } int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type) { union bpf_attr attr; bzero(&attr, sizeof(attr)); attr.target_fd = target_fd; attr.attach_bpf_fd = prog_fd; attr.attach_type = type; return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); } int bpf_prog_detach(int target_fd, enum bpf_attach_type type) { union bpf_attr attr; bzero(&attr, sizeof(attr)); attr.target_fd = target_fd; attr.attach_type = type; return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); } tr>committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100 commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch) treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/9p/Makefile parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/9p/Makefile')