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Nothing major: the stricter permissions checking for sysfs broke

Browse source 
a staging driver; fix included.  Greg KH said he'd take the patch
 but hadn't as the merge window opened, so it's included here
 to avoid breaking build.
 
 Cheers,
 Rusty.
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Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Pull module updates from Rusty Russell:
 "Nothing major: the stricter permissions checking for sysfs broke a
  staging driver; fix included.  Greg KH said he'd take the patch but
  hadn't as the merge window opened, so it's included here to avoid
  breaking build"

* tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  staging: fix up speakup kobject mode
  Use 'E' instead of 'X' for unsigned module taint flag.
  VERIFY_OCTAL_PERMISSIONS: stricter checking for sysfs perms.
  kallsyms: fix percpu vars on x86-64 with relocation.
  kallsyms: generalize address range checking
  module: LLVMLinux: Remove unused function warning from __param_check macro
  Fix: module signature vs tracepoints: add new TAINT_UNSIGNED_MODULE
  module: remove MODULE_GENERIC_TABLE
  module: allow multiple calls to MODULE_DEVICE_TABLE() per module
  module: use pr_cont
This commit is contained in:
Linus Torvalds 2014-04-06 09:38:07 -07:00
commit 6f4c98e1c2
37 changed files with 331 additions and 278 deletions
Download patch file Download diff file Expand all files Collapse all files

74
scripts/kallsyms.c
View file

@ -36,13 +36,13 @@ struct sym_entry {
unsigned char *sym;
};
struct text_range {
const char *stext, *etext;
struct addr_range {
const char *start_sym, *end_sym;
unsigned long long start, end;
};
static unsigned long long _text;
static struct text_range text_ranges[] = {
static struct addr_range text_ranges[] = {
{ "_stext", "_etext" },
{ "_sinittext", "_einittext" },
{ "_stext_l1", "_etext_l1" }, /* Blackfin on-chip L1 inst SRAM */
@ -51,9 +51,14 @@ static struct text_range text_ranges[] = {
#define text_range_text (&text_ranges[0])
#define text_range_inittext (&text_ranges[1])
static struct addr_range percpu_range = {
"__per_cpu_start", "__per_cpu_end", -1ULL, 0
};
static struct sym_entry *table;
static unsigned int table_size, table_cnt;
static int all_symbols = 0;
static int absolute_percpu = 0;
static char symbol_prefix_char = '\0';
static unsigned long long kernel_start_addr = 0;
@ -83,19 +88,20 @@ static inline int is_arm_mapping_symbol(const char *str)
&& (str[2] == '\0' || str[2] == '.');
}
static int read_symbol_tr(const char *sym, unsigned long long addr)
static int check_symbol_range(const char *sym, unsigned long long addr,
struct addr_range *ranges, int entries)
{
size_t i;
struct text_range *tr;
struct addr_range *ar;
for (i = 0; i < ARRAY_SIZE(text_ranges); ++i) {
tr = &text_ranges[i];
for (i = 0; i < entries; ++i) {
ar = &ranges[i];
if (strcmp(sym, tr->stext) == 0) {
tr->start = addr;
if (strcmp(sym, ar->start_sym) == 0) {
ar->start = addr;
return 0;
} else if (strcmp(sym, tr->etext) == 0) {
tr->end = addr;
} else if (strcmp(sym, ar->end_sym) == 0) {
ar->end = addr;
return 0;
}
}
@ -130,7 +136,8 @@ static int read_symbol(FILE *in, struct sym_entry *s)
/* Ignore most absolute/undefined (?) symbols. */
if (strcmp(sym, "_text") == 0)
_text = s->addr;
else if (read_symbol_tr(sym, s->addr) == 0)
else if (check_symbol_range(sym, s->addr, text_ranges,
ARRAY_SIZE(text_ranges)) == 0)
/* nothing to do */;
else if (toupper(stype) == 'A')
{
@ -164,18 +171,22 @@ static int read_symbol(FILE *in, struct sym_entry *s)
strcpy((char *)s->sym + 1, str);
s->sym[0] = stype;
/* Record if we've found __per_cpu_start/end. */
check_symbol_range(sym, s->addr, &percpu_range, 1);
return 0;
}
static int symbol_valid_tr(struct sym_entry *s)
static int symbol_in_range(struct sym_entry *s, struct addr_range *ranges,
int entries)
{
size_t i;
struct text_range *tr;
struct addr_range *ar;
for (i = 0; i < ARRAY_SIZE(text_ranges); ++i) {
tr = &text_ranges[i];
for (i = 0; i < entries; ++i) {
ar = &ranges[i];
if (s->addr >= tr->start && s->addr <= tr->end)
if (s->addr >= ar->start && s->addr <= ar->end)
return 1;
}
@ -214,7 +225,8 @@ static int symbol_valid(struct sym_entry *s)
/* if --all-symbols is not specified, then symbols outside the text
* and inittext sections are discarded */
if (!all_symbols) {
if (symbol_valid_tr(s) == 0)
if (symbol_in_range(s, text_ranges,
ARRAY_SIZE(text_ranges)) == 0)
return 0;
/* Corner case. Discard any symbols with the same value as
* _etext _einittext; they can move between pass 1 and 2 when
@ -223,9 +235,11 @@ static int symbol_valid(struct sym_entry *s)
* rules.
*/
if ((s->addr == text_range_text->end &&
strcmp((char *)s->sym + offset, text_range_text->etext)) ||
strcmp((char *)s->sym + offset,
text_range_text->end_sym)) ||
(s->addr == text_range_inittext->end &&
strcmp((char *)s->sym + offset, text_range_inittext->etext)))
strcmp((char *)s->sym + offset,
text_range_inittext->end_sym)))
return 0;
}
@ -298,6 +312,11 @@ static int expand_symbol(unsigned char *data, int len, char *result)
return total;
}
static int symbol_absolute(struct sym_entry *s)
{
return toupper(s->sym[0]) == 'A';
}
static void write_src(void)
{
unsigned int i, k, off;
@ -325,7 +344,7 @@ static void write_src(void)
*/
output_label("kallsyms_addresses");
for (i = 0; i < table_cnt; i++) {
if (toupper(table[i].sym[0]) != 'A') {
if (!symbol_absolute(&table[i])) {
if (_text <= table[i].addr)
printf("\tPTR\t_text + %#llx\n",
table[i].addr - _text);
@ -646,6 +665,15 @@ static void sort_symbols(void)
qsort(table, table_cnt, sizeof(struct sym_entry), compare_symbols);
}
static void make_percpus_absolute(void)
{
unsigned int i;
for (i = 0; i < table_cnt; i++)
if (symbol_in_range(&table[i], &percpu_range, 1))
table[i].sym[0] = 'A';
}
int main(int argc, char **argv)
{
if (argc >= 2) {
@ -653,6 +681,8 @@ int main(int argc, char **argv)
for (i = 1; i < argc; i++) {
if(strcmp(argv[i], "--all-symbols") == 0)
all_symbols = 1;
else if (strcmp(argv[i], "--absolute-percpu") == 0)
absolute_percpu = 1;
else if (strncmp(argv[i], "--symbol-prefix=", 16) == 0) {
char *p = &argv[i][16];
/* skip quote */
@ -669,6 +699,8 @@ int main(int argc, char **argv)
usage();
read_map(stdin);
if (absolute_percpu)
make_percpus_absolute();
sort_symbols();
optimize_token_table();
write_src();

4
scripts/link-vmlinux.sh
View file

@ -86,6 +86,10 @@ kallsyms()
kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
fi
if [ -n "${CONFIG_X86_64}" ]; then
kallsymopt="${kallsymopt} --absolute-percpu"
fi
local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"

14
scripts/mod/file2alias.c
View file

@ -42,7 +42,7 @@ typedef unsigned char __u8;
/* This array collects all instances that use the generic do_table */
struct devtable {
const char *device_id; /* name of table, __mod_<name>_device_table. */
const char *device_id; /* name of table, __mod_<name>__*_device_table. */
unsigned long id_size;
void *function;
};
@ -146,7 +146,8 @@ static void device_id_check(const char *modname, const char *device_id,
if (size % id_size || size < id_size) {
fatal("%s: sizeof(struct %s_device_id)=%lu is not a modulo "
"of the size of section __mod_%s_device_table=%lu.\n"
"of the size of "
"section __mod_%s__<identifier>_device_table=%lu.\n"
"Fix definition of struct %s_device_id "
"in mod_devicetable.h\n",
modname, device_id, id_size, device_id, size, device_id);
@ -1216,7 +1217,7 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
{
void *symval;
char *zeros = NULL;
const char *name;
const char *name, *identifier;
unsigned int namelen;
/* We're looking for a section relative symbol */
@ -1227,7 +1228,7 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT)
return;
/* All our symbols are of form <prefix>__mod_XXX_device_table. */
/* All our symbols are of form <prefix>__mod_<name>__<identifier>_device_table. */
name = strstr(symname, "__mod_");
if (!name)
return;
@ -1237,7 +1238,10 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
return;
if (strcmp(name + namelen - strlen("_device_table"), "_device_table"))
return;
namelen -= strlen("_device_table");
identifier = strstr(name, "__");
if (!identifier)
return;
namelen = identifier - name;
/* Handle all-NULL symbols allocated into .bss */
if (info->sechdrs[get_secindex(info, sym)].sh_type & SHT_NOBITS) {