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To perform partial reads, callers of kernel_read_file*() must have a non-NULL file_size argument and a preallocated buffer. The new "offset" argument can then be used to seek to specific locations in the file to fill the buffer to, at most, "buf_size" per call. Where possible, the LSM hooks can report whether a full file has been read or not so that the contents can be reasoned about. Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20201002173828.2099543-14-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_KERNEL_READ_FILE_H
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#define _LINUX_KERNEL_READ_FILE_H
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#include <linux/file.h>
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#include <linux/types.h>
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/* This is a list of *what* is being read, not *how* nor *where*. */
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#define __kernel_read_file_id(id) \
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id(UNKNOWN, unknown) \
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id(FIRMWARE, firmware) \
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id(MODULE, kernel-module) \
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id(KEXEC_IMAGE, kexec-image) \
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id(KEXEC_INITRAMFS, kexec-initramfs) \
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id(POLICY, security-policy) \
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id(X509_CERTIFICATE, x509-certificate) \
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id(MAX_ID, )
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#define __fid_enumify(ENUM, dummy) READING_ ## ENUM,
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#define __fid_stringify(dummy, str) #str,
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enum kernel_read_file_id {
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__kernel_read_file_id(__fid_enumify)
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};
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static const char * const kernel_read_file_str[] = {
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__kernel_read_file_id(__fid_stringify)
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};
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static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
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{
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if ((unsigned int)id >= READING_MAX_ID)
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return kernel_read_file_str[READING_UNKNOWN];
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return kernel_read_file_str[id];
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}
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int kernel_read_file(struct file *file, loff_t offset,
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void **buf, size_t buf_size,
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size_t *file_size,
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enum kernel_read_file_id id);
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int kernel_read_file_from_path(const char *path, loff_t offset,
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void **buf, size_t buf_size,
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size_t *file_size,
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enum kernel_read_file_id id);
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int kernel_read_file_from_path_initns(const char *path, loff_t offset,
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void **buf, size_t buf_size,
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size_t *file_size,
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enum kernel_read_file_id id);
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int kernel_read_file_from_fd(int fd, loff_t offset,
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void **buf, size_t buf_size,
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size_t *file_size,
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enum kernel_read_file_id id);
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#endif /* _LINUX_KERNEL_READ_FILE_H */
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