From 33a154a96e71a34a1bcca9f40da343dbbf7b38b4 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 1 Oct 2026 14:52:55 +0000 Subject: selftests/bpf: Test packet range of pointers sharing an id Add tests where two packet pointers share an id and tightening one pointer's umax from its var_off would put it less than their constant distance from the other's umax: with an index & 0x38 capped at 50, the base pointer keeps umax 50, so the pointer 8 bytes further on must keep umax 58, even though its known bits allow at most 56. These refused a valid program or accepted an out-of-bounds access before the fix: - check the advanced copy, load through the base: valid, was refused; - check the base, load the byte at base + 1 through a copy advanced by 8: was accepted; - check base + 4, load 4 bytes at base + 2 through base + 8: reads two bytes past the checked range, was accepted; - the same as the second with data_meta pointers checked against data: was accepted. These pass with and without the fix and cover nearby paths: - subtract an unknown scalar from a checked pointer and load below it (the range is kept across a new id); - reach a load through two paths whose checks cover 8 and 7 bytes after the loaded pointer; the second path must not be pruned by the first; - spill a copy of a pointer, check the pointer, fill the copy and load one byte past the checked range: the load is refused, and the copy has the range of the check. Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- drivers/cxl/security.c | 206 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 206 insertions(+) create mode 100644 drivers/cxl/security.c (limited to 'drivers/cxl/security.c') diff --git a/drivers/cxl/security.c b/drivers/cxl/security.c new file mode 100644 index 000000000..ab793e857 --- /dev/null +++ b/drivers/cxl/security.c @@ -0,0 +1,206 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2022 Intel Corporation. All rights reserved. */ +#include +#include +#include +#include +#include +#include +#include "cxlmem.h" +#include "cxl.h" + +static unsigned long cxl_pmem_get_security_flags(struct nvdimm *nvdimm, + enum nvdimm_passphrase_type ptype) +{ + struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm); + struct cxl_memdev *cxlmd = cxl_nvd->cxlmd; + struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds); + unsigned long security_flags = 0; + struct cxl_get_security_output { + __le32 flags; + } out; + struct cxl_mbox_cmd mbox_cmd; + u32 sec_out; + int rc; + + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_SECURITY_STATE, + .size_out = sizeof(out), + .payload_out = &out, + }; + + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc < 0) + return 0; + + sec_out = le32_to_cpu(out.flags); + /* cache security state */ + mds->security.state = sec_out; + + if (ptype == NVDIMM_MASTER) { + if (sec_out & CXL_PMEM_SEC_STATE_MASTER_PASS_SET) + set_bit(NVDIMM_SECURITY_UNLOCKED, &security_flags); + else + set_bit(NVDIMM_SECURITY_DISABLED, &security_flags); + if (sec_out & CXL_PMEM_SEC_STATE_MASTER_PLIMIT) + set_bit(NVDIMM_SECURITY_FROZEN, &security_flags); + return security_flags; + } + + if (sec_out & CXL_PMEM_SEC_STATE_USER_PASS_SET) { + if (sec_out & CXL_PMEM_SEC_STATE_FROZEN || + sec_out & CXL_PMEM_SEC_STATE_USER_PLIMIT) + set_bit(NVDIMM_SECURITY_FROZEN, &security_flags); + + if (sec_out & CXL_PMEM_SEC_STATE_LOCKED) + set_bit(NVDIMM_SECURITY_LOCKED, &security_flags); + else + set_bit(NVDIMM_SECURITY_UNLOCKED, &security_flags); + } else { + set_bit(NVDIMM_SECURITY_DISABLED, &security_flags); + } + + return security_flags; +} + +static int cxl_pmem_security_change_key(struct nvdimm *nvdimm, + const struct nvdimm_key_data *old_data, + const struct nvdimm_key_data *new_data, + enum nvdimm_passphrase_type ptype) +{ + struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm); + struct cxl_memdev *cxlmd = cxl_nvd->cxlmd; + struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox; + struct cxl_mbox_cmd mbox_cmd; + struct cxl_set_pass set_pass; + + set_pass = (struct cxl_set_pass) { + .type = ptype == NVDIMM_MASTER ? CXL_PMEM_SEC_PASS_MASTER : + CXL_PMEM_SEC_PASS_USER, + }; + memcpy(set_pass.old_pass, old_data->data, NVDIMM_PASSPHRASE_LEN); + memcpy(set_pass.new_pass, new_data->data, NVDIMM_PASSPHRASE_LEN); + + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_SET_PASSPHRASE, + .size_in = sizeof(set_pass), + .payload_in = &set_pass, + }; + + return cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); +} + +static int __cxl_pmem_security_disable(struct nvdimm *nvdimm, + const struct nvdimm_key_data *key_data, + enum nvdimm_passphrase_type ptype) +{ + struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm); + struct cxl_memdev *cxlmd = cxl_nvd->cxlmd; + struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox; + struct cxl_disable_pass dis_pass; + struct cxl_mbox_cmd mbox_cmd; + + dis_pass = (struct cxl_disable_pass) { + .type = ptype == NVDIMM_MASTER ? CXL_PMEM_SEC_PASS_MASTER : + CXL_PMEM_SEC_PASS_USER, + }; + memcpy(dis_pass.pass, key_data->data, NVDIMM_PASSPHRASE_LEN); + + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_DISABLE_PASSPHRASE, + .size_in = sizeof(dis_pass), + .payload_in = &dis_pass, + }; + + return cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); +} + +static int cxl_pmem_security_disable(struct nvdimm *nvdimm, + const struct nvdimm_key_data *key_data) +{ + return __cxl_pmem_security_disable(nvdimm, key_data, NVDIMM_USER); +} + +static int cxl_pmem_security_disable_master(struct nvdimm *nvdimm, + const struct nvdimm_key_data *key_data) +{ + return __cxl_pmem_security_disable(nvdimm, key_data, NVDIMM_MASTER); +} + +static int cxl_pmem_security_freeze(struct nvdimm *nvdimm) +{ + struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm); + struct cxl_memdev *cxlmd = cxl_nvd->cxlmd; + struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox; + struct cxl_mbox_cmd mbox_cmd = { + .opcode = CXL_MBOX_OP_FREEZE_SECURITY, + }; + + return cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); +} + +static int cxl_pmem_security_unlock(struct nvdimm *nvdimm, + const struct nvdimm_key_data *key_data) +{ + struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm); + struct cxl_memdev *cxlmd = cxl_nvd->cxlmd; + struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox; + u8 pass[NVDIMM_PASSPHRASE_LEN]; + struct cxl_mbox_cmd mbox_cmd; + int rc; + + memcpy(pass, key_data->data, NVDIMM_PASSPHRASE_LEN); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_UNLOCK, + .size_in = NVDIMM_PASSPHRASE_LEN, + .payload_in = pass, + }; + + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc < 0) + return rc; + + return 0; +} + +static int cxl_pmem_security_passphrase_erase(struct nvdimm *nvdimm, + const struct nvdimm_key_data *key, + enum nvdimm_passphrase_type ptype) +{ + struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm); + struct cxl_memdev *cxlmd = cxl_nvd->cxlmd; + struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox; + struct cxl_mbox_cmd mbox_cmd; + struct cxl_pass_erase erase; + int rc; + + erase = (struct cxl_pass_erase) { + .type = ptype == NVDIMM_MASTER ? CXL_PMEM_SEC_PASS_MASTER : + CXL_PMEM_SEC_PASS_USER, + }; + memcpy(erase.pass, key->data, NVDIMM_PASSPHRASE_LEN); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_PASSPHRASE_SECURE_ERASE, + .size_in = sizeof(erase), + .payload_in = &erase, + }; + + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc < 0) + return rc; + + return 0; +} + +static const struct nvdimm_security_ops __cxl_security_ops = { + .get_flags = cxl_pmem_get_security_flags, + .change_key = cxl_pmem_security_change_key, + .disable = cxl_pmem_security_disable, + .freeze = cxl_pmem_security_freeze, + .unlock = cxl_pmem_security_unlock, + .erase = cxl_pmem_security_passphrase_erase, + .disable_master = cxl_pmem_security_disable_master, +}; + +const struct nvdimm_security_ops *cxl_security_ops = &__cxl_security_ops; -- cgit v1.3.1