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67678189e4
This patch adds a new ipe_bprm_creds_for_exec() hook that integrates with the AT_EXECVE_CHECK mechanism. To enable script enforcement, interpreters need to incorporate the AT_EXECVE_CHECK flag when calling execveat() on script files before execution. When a userspace interpreter calls execveat() with the AT_EXECVE_CHECK flag, this hook triggers IPE policy evaluation on the script file. The hook only triggers IPE when bprm->is_check is true, ensuring it's being called from an AT_EXECVE_CHECK context. It then builds an evaluation context for an IPE_OP_EXEC operation and invokes IPE policy. The kernel returns the policy decision to the interpreter, which can then decide whether to proceed with script execution. This extends IPE enforcement to indirectly executed scripts, permitting trusted scripts to execute while denying untrusted ones. Signed-off-by: Yanzhu Huang <yanzhuhuang@linux.microsoft.com> Signed-off-by: Fan Wu <wufan@kernel.org>
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2024 Microsoft Corporation. All rights reserved.
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*/
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#ifndef _IPE_HOOKS_H
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#define _IPE_HOOKS_H
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#include <linux/fs.h>
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#include <linux/binfmts.h>
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#include <linux/security.h>
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#include <linux/blk_types.h>
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#include <linux/fsverity.h>
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enum ipe_hook_type {
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IPE_HOOK_BPRM_CHECK = 0,
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IPE_HOOK_BPRM_CREDS_FOR_EXEC,
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IPE_HOOK_MMAP,
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IPE_HOOK_MPROTECT,
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IPE_HOOK_KERNEL_READ,
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IPE_HOOK_KERNEL_LOAD,
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__IPE_HOOK_MAX
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};
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#define IPE_HOOK_INVALID __IPE_HOOK_MAX
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int ipe_bprm_check_security(struct linux_binprm *bprm);
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int ipe_bprm_creds_for_exec(struct linux_binprm *bprm);
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int ipe_mmap_file(struct file *f, unsigned long reqprot, unsigned long prot,
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unsigned long flags);
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int ipe_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
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unsigned long prot);
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int ipe_kernel_read_file(struct file *file, enum kernel_read_file_id id,
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bool contents);
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int ipe_kernel_load_data(enum kernel_load_data_id id, bool contents);
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void ipe_unpack_initramfs(void);
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#ifdef CONFIG_IPE_PROP_DM_VERITY
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void ipe_bdev_free_security(struct block_device *bdev);
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int ipe_bdev_setintegrity(struct block_device *bdev, enum lsm_integrity_type type,
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const void *value, size_t len);
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#endif /* CONFIG_IPE_PROP_DM_VERITY */
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#ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG
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int ipe_inode_setintegrity(const struct inode *inode, enum lsm_integrity_type type,
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const void *value, size_t size);
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#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
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#endif /* _IPE_HOOKS_H */
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