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This finally applies the stricter sysfs perms checking we pulled out

Browse Source 
before last merge window.  A few stragglers are fixed (thanks linux-next!)
 
 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:
 "This finally applies the stricter sysfs perms checking we pulled out
  before last merge window.  A few stragglers are fixed (thanks
  linux-next!)"

* tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  arch/powerpc/platforms/powernv/opal-dump.c: fix world-writable sysfs files
  arch/powerpc/platforms/powernv/opal-elog.c: fix world-writable sysfs files
  drivers/video/fbdev/s3c2410fb.c: don't make debug world-writable.
  ARM: avoid ARM binutils leaking ELF local symbols
  scripts: modpost: Remove numeric suffix pattern matching
  scripts: modpost: fix compilation warning
  sysfs: disallow world-writable files.
  module: return bool from within_module*()
  module: add within_module() function
  modules: Fix build error in moduleloader.h
This commit is contained in:
Linus Torvalds 2014-08-10 21:31:58 -07:00
commit c8d6637d04
8 changed files with 40 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/platforms/powernv/opal-dump.c
View File

@ -102,9 +102,9 @@ static ssize_t dump_ack_store(struct dump_obj *dump_obj,
* due to the dynamic size of the dump
*/
static struct dump_attribute id_attribute =
__ATTR(id, 0666, dump_id_show, NULL);
__ATTR(id, S_IRUGO, dump_id_show, NULL);
static struct dump_attribute type_attribute =
__ATTR(type, 0666, dump_type_show, NULL);
__ATTR(type, S_IRUGO, dump_type_show, NULL);
static struct dump_attribute ack_attribute =
__ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store);

4
arch/powerpc/platforms/powernv/opal-elog.c
View File

@ -82,9 +82,9 @@ static ssize_t elog_ack_store(struct elog_obj *elog_obj,
}
static struct elog_attribute id_attribute =
__ATTR(id, 0666, elog_id_show, NULL);
__ATTR(id, S_IRUGO, elog_id_show, NULL);
static struct elog_attribute type_attribute =
__ATTR(type, 0666, elog_type_show, NULL);
__ATTR(type, S_IRUGO, elog_type_show, NULL);
static struct elog_attribute ack_attribute =
__ATTR(acknowledge, 0660, elog_ack_show, elog_ack_store);

2
drivers/video/fbdev/s3c2410fb.c
View File

@ -616,7 +616,7 @@ static int s3c2410fb_debug_store(struct device *dev,
return len;
}
static DEVICE_ATTR(debug, 0666, s3c2410fb_debug_show, s3c2410fb_debug_store);
static DEVICE_ATTR(debug, 0664, s3c2410fb_debug_show, s3c2410fb_debug_store);
static struct fb_ops s3c2410fb_ops = {
.owner = THIS_MODULE,

2
include/linux/kernel.h
View File

@ -845,5 +845,7 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
/* User perms >= group perms >= other perms */ \
BUILD_BUG_ON_ZERO(((perms) >> 6) < (((perms) >> 3) & 7)) + \
BUILD_BUG_ON_ZERO((((perms) >> 3) & 7) < ((perms) & 7)) + \
/* Other writable? Generally considered a bad idea. */ \
BUILD_BUG_ON_ZERO((perms) & 2) + \
(perms))
#endif

11
include/linux/module.h
View File

@ -396,18 +396,25 @@ bool is_module_address(unsigned long addr);
bool is_module_percpu_address(unsigned long addr);
bool is_module_text_address(unsigned long addr);
static inline int within_module_core(unsigned long addr, const struct module *mod)
static inline bool within_module_core(unsigned long addr,
const struct module *mod)
{
return (unsigned long)mod->module_core <= addr &&
addr < (unsigned long)mod->module_core + mod->core_size;
}
static inline int within_module_init(unsigned long addr, const struct module *mod)
static inline bool within_module_init(unsigned long addr,
const struct module *mod)
{
return (unsigned long)mod->module_init <= addr &&
addr < (unsigned long)mod->module_init + mod->init_size;
}
static inline bool within_module(unsigned long addr, const struct module *mod)
{
return within_module_init(addr, mod) || within_module_core(addr, mod);
}
/* Search for module by name: must hold module_mutex. */
struct module *find_module(const char *name);

6
include/linux/moduleloader.h
View File

@ -45,7 +45,8 @@ static inline int apply_relocate(Elf_Shdr *sechdrs,
unsigned int relsec,
struct module *me)
{
printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
printk(KERN_ERR "module %s: REL relocation unsupported\n",
module_name(me));
return -ENOEXEC;
}
#endif
@ -67,7 +68,8 @@ static inline int apply_relocate_add(Elf_Shdr *sechdrs,
unsigned int relsec,
struct module *me)
{
printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
printk(KERN_ERR "module %s: REL relocation unsupported\n",
module_name(me));
return -ENOEXEC;
}
#endif

14
kernel/module.c
View File

@ -3381,6 +3381,8 @@ static inline int within(unsigned long addr, void *start, unsigned long size)
*/
static inline int is_arm_mapping_symbol(const char *str)
{
if (str[0] == '.' && str[1] == 'L')
return true;
return str[0] == '$' && strchr("atd", str[1])
&& (str[2] == '\0' || str[2] == '.');
}
@ -3444,8 +3446,7 @@ const char *module_address_lookup(unsigned long addr,
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (within_module_init(addr, mod) ||
within_module_core(addr, mod)) {
if (within_module(addr, mod)) {
if (modname)
*modname = mod->name;
ret = get_ksymbol(mod, addr, size, offset);
@ -3469,8 +3470,7 @@ int lookup_module_symbol_name(unsigned long addr, char *symname)
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (within_module_init(addr, mod) ||
within_module_core(addr, mod)) {
if (within_module(addr, mod)) {
const char *sym;
sym = get_ksymbol(mod, addr, NULL, NULL);
@ -3495,8 +3495,7 @@ int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (within_module_init(addr, mod) ||
within_module_core(addr, mod)) {
if (within_module(addr, mod)) {
const char *sym;
sym = get_ksymbol(mod, addr, size, offset);
@ -3760,8 +3759,7 @@ struct module *__module_address(unsigned long addr)
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (within_module_core(addr, mod)
|| within_module_init(addr, mod))
if (within_module(addr, mod))
return mod;
}
return NULL;

58
scripts/mod/modpost.c
View File

@ -772,32 +772,10 @@ static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
sechdr->sh_name;
}
/* if sym is empty or point to a string
* like ".[0-9]+" then return 1.
* This is the optional prefix added by ld to some sections
*/
static int number_prefix(const char *sym)
{
if (*sym++ == '\0')
return 1;
if (*sym != '.')
return 0;
do {
char c = *sym++;
if (c < '0' || c > '9')
return 0;
} while (*sym);
return 1;
}
/* The pattern is an array of simple patterns.
* "foo" will match an exact string equal to "foo"
* "*foo" will match a string that ends with "foo"
* "foo*" will match a string that begins with "foo"
* "foo$" will match a string equal to "foo" or "foo.1"
* where the '1' can be any number including several digits.
* The $ syntax is for sections where ld append a dot number
* to make section name unique.
*/
static int match(const char *sym, const char * const pat[])
{
@ -816,13 +794,6 @@ static int match(const char *sym, const char * const pat[])
if (strncmp(sym, p, strlen(p) - 1) == 0)
return 1;
}
/* "foo$" */
else if (*endp == '$') {
if (strncmp(sym, p, strlen(p) - 1) == 0) {
if (number_prefix(sym + strlen(p) - 1))
return 1;
}
}
/* no wildcards */
else {
if (strcmp(p, sym) == 0)
@ -880,20 +851,20 @@ static void check_section(const char *modname, struct elf_info *elf,
#define ALL_INIT_DATA_SECTIONS \
".init.setup$", ".init.rodata$", ".meminit.rodata$", \
".init.data$", ".meminit.data$"
".init.setup", ".init.rodata", ".meminit.rodata", \
".init.data", ".meminit.data"
#define ALL_EXIT_DATA_SECTIONS \
".exit.data$", ".memexit.data$"
".exit.data", ".memexit.data"
#define ALL_INIT_TEXT_SECTIONS \
".init.text$", ".meminit.text$"
".init.text", ".meminit.text"
#define ALL_EXIT_TEXT_SECTIONS \
".exit.text$", ".memexit.text$"
".exit.text", ".memexit.text"
#define ALL_PCI_INIT_SECTIONS \
".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \
".pci_fixup_enable$", ".pci_fixup_resume$", \
".pci_fixup_resume_early$", ".pci_fixup_suspend$"
".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
".pci_fixup_enable", ".pci_fixup_resume", \
".pci_fixup_resume_early", ".pci_fixup_suspend"
#define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
#define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
@ -901,8 +872,8 @@ static void check_section(const char *modname, struct elf_info *elf,
#define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
#define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
#define DATA_SECTIONS ".data$", ".data.rel$"
#define TEXT_SECTIONS ".text$", ".text.unlikely$"
#define DATA_SECTIONS ".data", ".data.rel"
#define TEXT_SECTIONS ".text", ".text.unlikely"
#define INIT_SECTIONS ".init.*"
#define MEM_INIT_SECTIONS ".meminit.*"
@ -1703,12 +1674,11 @@ static void check_sec_ref(struct module *mod, const char *modname,
static char *remove_dot(char *s)
{
char *end;
int n = strcspn(s, ".");
size_t n = strcspn(s, ".");
if (n > 0 && s[n] != 0) {
strtoul(s + n + 1, &end, 10);
if (end > s + n + 1 && (*end == '.' || *end == 0))
if (n && s[n]) {
size_t m = strspn(s + n + 1, "0123456789");
if (m && (s[n + m] == '.' || s[n + m] == 0))
s[n] = 0;
}
return s;