From e9ee9efc0d176512cdce9d27ff8549d7ffa2bfcd Mon Sep 17 00:00:00 2001 From: David Miller Date: Fri, 30 Nov 2018 21:08:14 -0800 Subject: [PATCH] bpf: Add BPF_F_ANY_ALIGNMENT. Often we want to write tests cases that check things like bad context offset accesses. And one way to do this is to use an odd offset on, for example, a 32-bit load. This unfortunately triggers the alignment checks first on platforms that do not set CONFIG_EFFICIENT_UNALIGNED_ACCESS. So the test case see the alignment failure rather than what it was testing for. It is often not completely possible to respect the original intention of the test, or even test the same exact thing, while solving the alignment issue. Another option could have been to check the alignment after the context and other validations are performed by the verifier, but that is a non-trivial change to the verifier. Signed-off-by: David S. Miller Signed-off-by: Alexei Starovoitov --- include/uapi/linux/bpf.h | 14 ++++++++++++++ kernel/bpf/syscall.c | 7 ++++++- kernel/bpf/verifier.c | 2 ++ tools/include/uapi/linux/bpf.h | 14 ++++++++++++++ tools/lib/bpf/bpf.c | 8 ++++---- tools/lib/bpf/bpf.h | 2 +- tools/testing/selftests/bpf/test_align.c | 4 ++-- tools/testing/selftests/bpf/test_verifier.c | 3 ++- 8 files changed, 45 insertions(+), 9 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 597afdb..8050cae 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -232,6 +232,20 @@ enum bpf_attach_type { */ #define BPF_F_STRICT_ALIGNMENT (1U << 0) +/* If BPF_F_ANY_ALIGNMENT is used in BPF_PROF_LOAD command, the + * verifier will allow any alignment whatsoever. On platforms + * with strict alignment requirements for loads ands stores (such + * as sparc and mips) the verifier validates that all loads and + * stores provably follow this requirement. This flag turns that + * checking and enforcement off. + * + * It is mostly used for testing when we want to validate the + * context and memory access aspects of the verifier, but because + * of an unaligned access the alignment check would trigger before + * the one we are interested in. + */ +#define BPF_F_ANY_ALIGNMENT (1U << 1) + /* when bpf_ldimm64->src_reg == BPF_PSEUDO_MAP_FD, bpf_ldimm64->imm == fd */ #define BPF_PSEUDO_MAP_FD 1 diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 85cbeec..f9554d9 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1452,9 +1452,14 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) if (CHECK_ATTR(BPF_PROG_LOAD)) return -EINVAL; - if (attr->prog_flags & ~BPF_F_STRICT_ALIGNMENT) + if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT | BPF_F_ANY_ALIGNMENT)) return -EINVAL; + if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && + (attr->prog_flags & BPF_F_ANY_ALIGNMENT) && + !capable(CAP_SYS_ADMIN)) + return -EPERM; + /* copy eBPF program license from user space */ if (strncpy_from_user(license, u64_to_user_ptr(attr->license), sizeof(license) - 1) < 0) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 9584438..71988337 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -6505,6 +6505,8 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr, env->strict_alignment = !!(attr->prog_flags & BPF_F_STRICT_ALIGNMENT); if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) env->strict_alignment = true; + if (attr->prog_flags & BPF_F_ANY_ALIGNMENT) + env->strict_alignment = false; ret = replace_map_fd_with_map_ptr(env); if (ret < 0) diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 597afdb..8050cae 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -232,6 +232,20 @@ enum bpf_attach_type { */ #define BPF_F_STRICT_ALIGNMENT (1U << 0) +/* If BPF_F_ANY_ALIGNMENT is used in BPF_PROF_LOAD command, the + * verifier will allow any alignment whatsoever. On platforms + * with strict alignment requirements for loads ands stores (such + * as sparc and mips) the verifier validates that all loads and + * stores provably follow this requirement. This flag turns that + * checking and enforcement off. + * + * It is mostly used for testing when we want to validate the + * context and memory access aspects of the verifier, but because + * of an unaligned access the alignment check would trigger before + * the one we are interested in. + */ +#define BPF_F_ANY_ALIGNMENT (1U << 1) + /* when bpf_ldimm64->src_reg == BPF_PSEUDO_MAP_FD, bpf_ldimm64->imm == fd */ #define BPF_PSEUDO_MAP_FD 1 diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index ce18221..c19226c 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -279,9 +279,9 @@ int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, } int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, - size_t insns_cnt, int strict_alignment, - const char *license, __u32 kern_version, - char *log_buf, size_t log_buf_sz, int log_level) + size_t insns_cnt, __u32 prog_flags, const char *license, + __u32 kern_version, char *log_buf, size_t log_buf_sz, + int log_level) { union bpf_attr attr; @@ -295,7 +295,7 @@ int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, attr.log_level = log_level; log_buf[0] = 0; attr.kern_version = kern_version; - attr.prog_flags = strict_alignment ? BPF_F_STRICT_ALIGNMENT : 0; + attr.prog_flags = prog_flags; return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); } diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index 09e8bbe..60392b7 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -98,7 +98,7 @@ LIBBPF_API int bpf_load_program(enum bpf_prog_type type, char *log_buf, size_t log_buf_sz); LIBBPF_API int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, - size_t insns_cnt, int strict_alignment, + size_t insns_cnt, __u32 prog_flags, const char *license, __u32 kern_version, char *log_buf, size_t log_buf_sz, int log_level); diff --git a/tools/testing/selftests/bpf/test_align.c b/tools/testing/selftests/bpf/test_align.c index 5f377ec..3c789d0 100644 --- a/tools/testing/selftests/bpf/test_align.c +++ b/tools/testing/selftests/bpf/test_align.c @@ -620,8 +620,8 @@ static int do_test_single(struct bpf_align_test *test) prog_len = probe_filter_length(prog); fd_prog = bpf_verify_program(prog_type ? : BPF_PROG_TYPE_SOCKET_FILTER, - prog, prog_len, 1, "GPL", 0, - bpf_vlog, sizeof(bpf_vlog), 2); + prog, prog_len, BPF_F_STRICT_ALIGNMENT, + "GPL", 0, bpf_vlog, sizeof(bpf_vlog), 2); if (fd_prog < 0 && test->result != REJECT) { printf("Failed to load program.\n"); printf("%s", bpf_vlog); diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c index 5eace1f6..78e779c 100644 --- a/tools/testing/selftests/bpf/test_verifier.c +++ b/tools/testing/selftests/bpf/test_verifier.c @@ -14275,7 +14275,8 @@ static void do_test_single(struct bpf_test *test, bool unpriv, prog_len = probe_filter_length(prog); fd_prog = bpf_verify_program(prog_type, prog, prog_len, - test->flags & F_LOAD_WITH_STRICT_ALIGNMENT, + test->flags & F_LOAD_WITH_STRICT_ALIGNMENT ? + BPF_F_STRICT_ALIGNMENT : 0, "GPL", 0, bpf_vlog, sizeof(bpf_vlog), 1); expected_ret = unpriv && test->result_unpriv != UNDEF ? -- 2.7.4