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https://github.com/torvalds/linux
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94f7f6182c
efivar operation is updated when the tee_stmm_efi module is probed. tee_stmm_efi module supports SetVariable runtime service, but user needs to manually remount the efivarfs as RW to enable the write access if the previous efivar operation does not support SetVariable and efivarfs is mounted as read-only. This commit notifies the update of efivar operation to efivarfs subsystem, then drops SB_RDONLY flag if the efivar operation supports SetVariable. Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org> [ardb: use per-superblock instance of the notifier block] Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Red Hat, Inc.
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* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
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*/
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#ifndef EFIVAR_FS_INTERNAL_H
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#define EFIVAR_FS_INTERNAL_H
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#include <linux/list.h>
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#include <linux/efi.h>
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struct efivarfs_mount_opts {
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kuid_t uid;
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kgid_t gid;
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};
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struct efivarfs_fs_info {
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struct efivarfs_mount_opts mount_opts;
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struct list_head efivarfs_list;
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struct super_block *sb;
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struct notifier_block nb;
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};
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struct efi_variable {
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efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)];
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efi_guid_t VendorGuid;
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unsigned long DataSize;
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__u8 Data[1024];
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efi_status_t Status;
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__u32 Attributes;
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} __attribute__((packed));
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struct efivar_entry {
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struct efi_variable var;
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struct list_head list;
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struct kobject kobj;
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};
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int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *,
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struct list_head *),
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void *data, bool duplicates, struct list_head *head);
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int efivar_entry_add(struct efivar_entry *entry, struct list_head *head);
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void __efivar_entry_add(struct efivar_entry *entry, struct list_head *head);
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void efivar_entry_remove(struct efivar_entry *entry);
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int efivar_entry_delete(struct efivar_entry *entry);
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int efivar_entry_size(struct efivar_entry *entry, unsigned long *size);
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int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
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unsigned long *size, void *data);
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int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
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unsigned long *size, void *data);
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int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
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unsigned long *size, void *data, bool *set);
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int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
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struct list_head *head, void *data);
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bool efivar_validate(efi_guid_t vendor, efi_char16_t *var_name, u8 *data,
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unsigned long data_size);
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bool efivar_variable_is_removable(efi_guid_t vendor, const char *name,
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size_t len);
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extern const struct file_operations efivarfs_file_operations;
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extern const struct inode_operations efivarfs_dir_inode_operations;
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extern bool efivarfs_valid_name(const char *str, int len);
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extern struct inode *efivarfs_get_inode(struct super_block *sb,
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const struct inode *dir, int mode, dev_t dev,
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bool is_removable);
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#endif /* EFIVAR_FS_INTERNAL_H */
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