mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
dabba87229
Patch series "Allow to kexec with initramfs larger than 2G", v2. Currently, the largest initramfs that is supported by kexec_file_load() syscall is 2G. This is because kernel_read_file() returns int, and is limited to INT_MAX or 2G. On the other hand, there are kexec based boot loaders (i.e. u-root), that may need to boot netboot images that might be larger than 2G. The first patch changes the return type from int to ssize_t in kernel_read_file* functions. The second patch increases the maximum initramfs file size to 4G. Tested: verified that can kexec_file_load() works with 4G initramfs on x86_64. This patch (of 2): Currently, the maximum file size that is supported is 2G. This may be too small in some cases. For example, kexec_file_load() system call loads initramfs. In some netboot cases initramfs can be rather large. Allow to use up-to ssize_t bytes. The callers still can limit the maximum file size via buf_size. Link: https://lkml.kernel.org/r/20220527025535.3953665-1-pasha.tatashin@soleen.com Link: https://lkml.kernel.org/r/20220527025535.3953665-2-pasha.tatashin@soleen.com Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Baoquan He <bhe@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Greg Thelen <gthelen@google.com> Cc: Sasha Levin <sashal@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_KERNEL_READ_FILE_H
|
|
#define _LINUX_KERNEL_READ_FILE_H
|
|
|
|
#include <linux/file.h>
|
|
#include <linux/types.h>
|
|
|
|
/* This is a list of *what* is being read, not *how* nor *where*. */
|
|
#define __kernel_read_file_id(id) \
|
|
id(UNKNOWN, unknown) \
|
|
id(FIRMWARE, firmware) \
|
|
id(MODULE, kernel-module) \
|
|
id(KEXEC_IMAGE, kexec-image) \
|
|
id(KEXEC_INITRAMFS, kexec-initramfs) \
|
|
id(POLICY, security-policy) \
|
|
id(X509_CERTIFICATE, x509-certificate) \
|
|
id(MAX_ID, )
|
|
|
|
#define __fid_enumify(ENUM, dummy) READING_ ## ENUM,
|
|
#define __fid_stringify(dummy, str) #str,
|
|
|
|
enum kernel_read_file_id {
|
|
__kernel_read_file_id(__fid_enumify)
|
|
};
|
|
|
|
static const char * const kernel_read_file_str[] = {
|
|
__kernel_read_file_id(__fid_stringify)
|
|
};
|
|
|
|
static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
|
|
{
|
|
if ((unsigned int)id >= READING_MAX_ID)
|
|
return kernel_read_file_str[READING_UNKNOWN];
|
|
|
|
return kernel_read_file_str[id];
|
|
}
|
|
|
|
ssize_t kernel_read_file(struct file *file, loff_t offset,
|
|
void **buf, size_t buf_size,
|
|
size_t *file_size,
|
|
enum kernel_read_file_id id);
|
|
ssize_t kernel_read_file_from_path(const char *path, loff_t offset,
|
|
void **buf, size_t buf_size,
|
|
size_t *file_size,
|
|
enum kernel_read_file_id id);
|
|
ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
|
|
void **buf, size_t buf_size,
|
|
size_t *file_size,
|
|
enum kernel_read_file_id id);
|
|
ssize_t kernel_read_file_from_fd(int fd, loff_t offset,
|
|
void **buf, size_t buf_size,
|
|
size_t *file_size,
|
|
enum kernel_read_file_id id);
|
|
|
|
#endif /* _LINUX_KERNEL_READ_FILE_H */
|