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modprobe/insmod for 2.4: support compressed modules.

Browse Source 
by Guenter (lists AT gknw.net)

function                                             old     new   delta
bb_init_module_24                                   4551    4570     +19
obj_load                                             786     794      +8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 27/0)               Total: 27 bytes
This commit is contained in:
Denis Vlasenko 2009-04-05 23:25:09 +00:00
parent 913a201bf0
commit f4393046ef
1 changed files with 33 additions and 24 deletions
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57
modutils/modutils-24.c
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@ -625,7 +625,11 @@ static unsigned long obj_load_size(struct obj_file *f);
static int obj_relocate(struct obj_file *f, ElfW(Addr) base);
static struct obj_file *obj_load(int fd, int loadprogbits);
#if !LOADBITS
#define obj_load(image, image_size, loadprogbits) \
obj_load(image, image_size)
#endif
static struct obj_file *obj_load(char *image, size_t image_size, int loadprogbits);
static int obj_create_image(struct obj_file *f, char *image);
@ -3191,7 +3195,7 @@ static int obj_create_image(struct obj_file *f, char *image)
/*======================================================================*/
static struct obj_file *obj_load(int fd, int loadprogbits UNUSED_PARAM)
static struct obj_file *obj_load(char *image, size_t image_size, int loadprogbits)
{
#if BB_LITTLE_ENDIAN
# define ELFMAG_U32 ((uint32_t)(ELFMAG0 + 0x100 * (ELFMAG1 + (0x100 * (ELFMAG2 + 0x100 * ELFMAG3)))))
@ -3210,8 +3214,9 @@ static struct obj_file *obj_load(int fd, int loadprogbits UNUSED_PARAM)
f->symbol_hash = obj_elf_hash;
f->load_order_search_start = &f->load_order;
xlseek(fd, 0, SEEK_SET);
xread(fd, &f->header, sizeof(f->header));
if (image_size < sizeof(f->header))
bb_error_msg_and_die("error while loading ELF header");
memcpy(&f->header, image, sizeof(f->header));
if (*(uint32_t*)(&f->header.e_ident) != ELFMAG_U32) {
bb_error_msg_and_die("not an ELF file");
@ -3242,8 +3247,9 @@ static struct obj_file *obj_load(int fd, int loadprogbits UNUSED_PARAM)
f->sections = xzalloc(sizeof(f->sections[0]) * (shnum + 4));
section_headers = alloca(sizeof(ElfW(Shdr)) * shnum);
xlseek(fd, f->header.e_shoff, SEEK_SET);
xread(fd, section_headers, sizeof(ElfW(Shdr)) * shnum);
if (image_size < f->header.e_shoff + sizeof(ElfW(Shdr)) * shnum)
bb_error_msg_and_die("error while loading section headers");
memcpy(section_headers, image + f->header.e_shoff, sizeof(ElfW(Shdr)) * shnum);
/* Read the section data. */
@ -3275,8 +3281,9 @@ static struct obj_file *obj_load(int fd, int loadprogbits UNUSED_PARAM)
sec->contents = NULL;
if (sec->header.sh_size > 0) {
sec->contents = xmalloc(sec->header.sh_size);
xlseek(fd, sec->header.sh_offset, SEEK_SET);
xread(fd, sec->contents, sec->header.sh_size);
if (image_size < (sec->header.sh_offset + sec->header.sh_size))
bb_error_msg_and_die("error while loading section data");
memcpy(sec->contents, image + sec->header.sh_offset, sec->header.sh_size);
}
break;
#if SHT_RELM == SHT_REL
@ -3392,7 +3399,7 @@ static struct obj_file *obj_load(int fd, int loadprogbits UNUSED_PARAM)
* kernel for the module
*/
static int obj_load_progbits(int fd, struct obj_file *f, char *imagebase)
static int obj_load_progbits(char *image, size_t image_size, struct obj_file *f, char *imagebase)
{
ElfW(Addr) base = f->baseaddr;
struct obj_section* sec;
@ -3404,12 +3411,11 @@ static int obj_load_progbits(int fd, struct obj_file *f, char *imagebase)
if (sec->header.sh_size == 0)
continue;
sec->contents = imagebase + (sec->header.sh_addr - base);
xlseek(fd, sec->header.sh_offset, SEEK_SET);
errno = 0; /* read may be short without errno being set */
if (full_read(fd, sec->contents, sec->header.sh_size) != sec->header.sh_size) {
bb_perror_msg("error reading ELF section data");
return 0;
if (image_size < (sec->header.sh_offset + sec->header.sh_size)) {
bb_error_msg("error reading ELF section data");
return 0; /* need to delete half-loaded module! */
}
memcpy(sec->contents, image + sec->header.sh_offset, sec->header.sh_size);
}
return 1;
}
@ -3771,23 +3777,26 @@ int FAST_FUNC bb_init_module_24(const char *m_filename, const char *options)
struct utsname uts;
int exit_status = EXIT_FAILURE;
int m_has_modinfo;
char *m_name, *p;
char *m_name;
#if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
char m_strversion[STRVERSIONLEN];
int m_version, m_crcs;
#endif
int fd;
char *image;
size_t image_size = 64 * 1024 * 1024;
uname(&uts);
fd = open_or_warn(m_filename, O_RDONLY);
if (fd < 0)
/* Load module into memory and unzip if compressed */
image = xmalloc_open_zipped_read_close(m_filename, &image_size);
if (!image)
return EXIT_FAILURE;
m_name = xstrdup(bb_basename(m_filename));
p = strrchr(m_name, '.');
if (p) *p = '\0';
/* "module.o[.gz]" -> "module" */
*strchrnul(m_name, '.') = '\0';
f = obj_load(fd, LOADBITS);
f = obj_load(image, image_size, LOADBITS);
m_has_modinfo = (get_modinfo_value(f, "kernel_version") != NULL);
@ -3816,7 +3825,7 @@ int FAST_FUNC bb_init_module_24(const char *m_filename, const char *options)
#endif
if (query_module(NULL, 0, NULL, 0, NULL))
bb_error_msg_and_die("not configured to support old kernels");
bb_error_msg_and_die("old (unsupported) kernel");
new_get_kernel_symbols();
k_crcs = new_is_kernel_checksummed();
@ -3869,7 +3878,7 @@ int FAST_FUNC bb_init_module_24(const char *m_filename, const char *options)
* the PROGBITS section was not loaded by the obj_load
* now we can load them directly into the kernel memory
*/
if (!obj_load_progbits(fd, f, (char*)m_addr)) {
if (!obj_load_progbits(image, image_size, f, (char*)m_addr)) {
delete_module(m_name, 0);
goto out;
}
@ -3891,7 +3900,7 @@ int FAST_FUNC bb_init_module_24(const char *m_filename, const char *options)
exit_status = EXIT_SUCCESS;
out:
close(fd);
free(image);
free(m_name);
return exit_status;