From 836b2fe544a5e9b5ce116622cb36fba33838c6fd Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 01:33:23 -0700 Subject: selftests/bpf: Check that JMP32 pointer vs zero jumps are not predicted Add jmp32_ptr_vs_zero_jne: the fall-through of the 32-bit compare, which the verifier used to skip, contains an out of bounds map value access, hence w/o the previous patch the program is accepted. See previous patch for detailed description. Reported-by: Nicholas Carlini Suggested-by: Nicholas Carlini Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/bpf/20260904083325.2083493-6-eddyz87@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- security/bpf/hooks.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 security/bpf/hooks.c (limited to 'security/bpf/hooks.c') diff --git a/security/bpf/hooks.c b/security/bpf/hooks.c new file mode 100644 index 000000000..7b98f5d1e --- /dev/null +++ b/security/bpf/hooks.c @@ -0,0 +1,42 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Copyright (C) 2020 Google LLC. + */ +#include +#include +#include + +bool bpf_lsm_initialized __ro_after_init; + +static struct security_hook_list bpf_lsm_hooks[] __ro_after_init = { + #define LSM_HOOK(RET, DEFAULT, NAME, ...) \ + LSM_HOOK_INIT(NAME, bpf_lsm_##NAME), + #include + #undef LSM_HOOK + LSM_HOOK_INIT(inode_free_security, bpf_inode_storage_free), +}; + +static const struct lsm_id bpf_lsmid = { + .name = "bpf", + .id = LSM_ID_BPF, +}; + +static int __init bpf_lsm_init(void) +{ + security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks), + &bpf_lsmid); + bpf_lsm_initialized = true; + pr_info("LSM support for eBPF active\n"); + return 0; +} + +struct lsm_blob_sizes bpf_lsm_blob_sizes __ro_after_init = { + .lbs_inode = sizeof(struct bpf_storage_blob), +}; + +DEFINE_LSM(bpf) = { + .id = &bpf_lsmid, + .init = bpf_lsm_init, + .blobs = &bpf_lsm_blob_sizes +}; -- cgit v1.3.1