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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "fd-util.h"
#include "fileio.h"
#include "env-file.h"
#include "kernel-image.h"
#include "os-util.h"
#include "parse-util.h"
#include "pe-binary.h"
#include "string-table.h"
#define PE_SECTION_READ_MAX (16U*1024U)
static const char * const kernel_image_type_table[_KERNEL_IMAGE_TYPE_MAX] = {
[KERNEL_IMAGE_TYPE_UNKNOWN] = "unknown",
[KERNEL_IMAGE_TYPE_UKI] = "uki",
[KERNEL_IMAGE_TYPE_PE] = "pe",
};
DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_image_type, KernelImageType);
static int uki_read_pretty_name(
int fd,
const PeHeader *pe_header,
const IMAGE_SECTION_HEADER *sections,
char **ret) {
_cleanup_free_ char *pname = NULL, *name = NULL;
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ void *osrel = NULL;
size_t osrel_size;
int r;
assert(fd >= 0);
assert(pe_header);
assert(sections || le16toh(pe_header->pe.NumberOfSections) == 0);
assert(ret);
r = pe_read_section_data(
fd,
pe_header,
sections,
".osrel",
/* max_size=*/ PE_SECTION_READ_MAX,
&osrel,
&osrel_size);
if (r == -ENXIO) { /* Section not found */
*ret = NULL;
return 0;
}
f = fmemopen(osrel, osrel_size, "r");
if (!f)
return log_error_errno(errno, "Failed to open embedded os-release file: %m");
r = parse_env_file(
f, NULL,
"PRETTY_NAME", &pname,
"NAME", &name);
if (r < 0)
return log_error_errno(r, "Failed to parse embedded os-release file: %m");
/* follow the same logic as os_release_pretty_name() */
if (!isempty(pname))
*ret = TAKE_PTR(pname);
else if (!isempty(name))
*ret = TAKE_PTR(name);
else {
char *n = strdup("Linux");
if (!n)
return log_oom();
*ret = n;
}
return 0;
}
static int inspect_uki(
int fd,
const PeHeader *pe_header,
const IMAGE_SECTION_HEADER *sections,
char **ret_cmdline,
char **ret_uname,
char **ret_pretty_name) {
_cleanup_free_ char *cmdline = NULL, *uname = NULL, *pname = NULL;
int r;
assert(fd >= 0);
assert(sections || le16toh(pe_header->pe.NumberOfSections) == 0);
if (ret_cmdline) {
r = pe_read_section_data(fd, pe_header, sections, ".cmdline", PE_SECTION_READ_MAX, (void**) &cmdline, NULL);
if (r < 0 && r != -ENXIO) /* If the section doesn't exist, that's fine */
return r;
}
if (ret_uname) {
r = pe_read_section_data(fd, pe_header, sections, ".uname", PE_SECTION_READ_MAX, (void**) &uname, NULL);
if (r < 0 && r != -ENXIO) /* If the section doesn't exist, that's fine */
return r;
}
if (ret_pretty_name) {
r = uki_read_pretty_name(fd, pe_header, sections, &pname);
if (r < 0)
return r;
}
if (ret_cmdline)
*ret_cmdline = TAKE_PTR(cmdline);
if (ret_uname)
*ret_uname = TAKE_PTR(uname);
if (ret_pretty_name)
*ret_pretty_name = TAKE_PTR(pname);
return 0;
}
int inspect_kernel(
int dir_fd,
const char *filename,
KernelImageType *ret_type,
char **ret_cmdline,
char **ret_uname,
char **ret_pretty_name) {
_cleanup_free_ IMAGE_SECTION_HEADER *sections = NULL;
_cleanup_free_ IMAGE_DOS_HEADER *dos_header = NULL;
KernelImageType t = KERNEL_IMAGE_TYPE_UNKNOWN;
_cleanup_free_ PeHeader *pe_header = NULL;
_cleanup_close_ int fd = -EBADF;
int r;
assert(dir_fd >= 0 || dir_fd == AT_FDCWD);
assert(filename);
fd = openat(dir_fd, filename, O_RDONLY|O_CLOEXEC);
if (fd < 0)
return log_error_errno(errno, "Failed to open kernel image file '%s': %m", filename);
r = pe_load_headers(fd, &dos_header, &pe_header);
if (r == -EBADMSG) /* not a valid PE file */
goto not_uki;
if (r < 0)
return log_error_errno(r, "Failed to parse kernel image file '%s': %m", filename);
r = pe_load_sections(fd, dos_header, pe_header, §ions);
if (r == -EBADMSG) /* not a valid PE file */
goto not_uki;
if (r < 0)
return log_error_errno(r, "Failed to load PE sections from kernel image file '%s': %m", filename);
if (pe_is_uki(pe_header, sections)) {
r = inspect_uki(fd, pe_header, sections, ret_cmdline, ret_uname, ret_pretty_name);
if (r < 0)
return r;
t = KERNEL_IMAGE_TYPE_UKI;
goto done;
} else
t = KERNEL_IMAGE_TYPE_PE;
not_uki:
if (ret_cmdline)
*ret_cmdline = NULL;
if (ret_uname)
*ret_uname = NULL;
if (ret_pretty_name)
*ret_pretty_name = NULL;
done:
if (ret_type)
*ret_type = t;
return 0;
}
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