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nexedi
linux
Commits
67ac5b86
Commit
67ac5b86
authored
Apr 29, 2003
by
Rusty Russell
Committed by
Christoph Hellwig
Apr 29, 2003
Browse files
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[PATCH] complete modinfo section
Restores .modinfo section, and uses it to store license and vermagic.
parent
d1f880ab
Changes
3
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Showing
3 changed files
with
90 additions
and
49 deletions
+90
-49
include/linux/module.h
include/linux/module.h
+29
-19
kernel/module.c
kernel/module.c
+60
-27
scripts/modpost.c
scripts/modpost.c
+1
-3
No files found.
include/linux/module.h
View file @
67ac5b86
...
...
@@ -20,10 +20,7 @@
#include <asm/module.h>
/* Not Yet Implemented */
#define MODULE_AUTHOR(name)
#define MODULE_DESCRIPTION(desc)
#define MODULE_SUPPORTED_DEVICE(name)
#define MODULE_PARM_DESC(var,desc)
#define print_modules()
/* v850 toolchain uses a `_' prefix for all user symbols */
...
...
@@ -58,12 +55,11 @@ search_extable(const struct exception_table_entry *first,
unsigned
long
value
);
#ifdef MODULE
#define ___module_cat(a,b) a ## b
#define ___module_cat(a,b)
__mod_ ##
a ## b
#define __module_cat(a,b) ___module_cat(a,b)
/* For userspace: you can also call me... */
#define MODULE_ALIAS(alias) \
static const char __module_cat(__alias_,__LINE__)[] \
__attribute__((section(".modinfo"),unused)) = "alias=" alias
#define __MODULE_INFO(tag, name, info) \
static const char __module_cat(name,__LINE__)[] \
__attribute__((section(".modinfo"),unused)) = __stringify(tag) "=" info
#define MODULE_GENERIC_TABLE(gtype,name) \
extern const struct gtype##_id __mod_##gtype##_table \
...
...
@@ -71,6 +67,19 @@ extern const struct gtype##_id __mod_##gtype##_table \
#define THIS_MODULE (&__this_module)
#else
/* !MODULE */
#define MODULE_GENERIC_TABLE(gtype,name)
#define __MODULE_INFO(tag, name, info)
#define THIS_MODULE ((struct module *)0)
#endif
/* Generic info of form tag = "info" */
#define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
/* For userspace: you can also call me... */
#define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
/*
* The following license idents are currently accepted as indicating free
* software modules
...
...
@@ -97,17 +106,18 @@ extern const struct gtype##_id __mod_##gtype##_table \
* 2. So the community can ignore bug reports including proprietary modules
* 3. So vendors can do likewise based on their own policies
*/
#define MODULE_LICENSE(license) \
static const char __module_license[] \
__attribute__((section(".init.license"), unused)) = license
#else
/* !MODULE */
#define MODULE_ALIAS(alias)
#define MODULE_GENERIC_TABLE(gtype,name)
#define THIS_MODULE ((struct module *)0)
#define MODULE_LICENSE(license)
#endif
#define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
/* Author, ideally of form NAME <EMAIL>[, NAME <EMAIL>]*[ and NAME <EMAIL>] */
#define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
/* What your module does. */
#define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
/* One for each parameter, describing how to use it. Some files do
multiple of these per line, so can't just use MODULE_INFO. */
#define MODULE_PARM_DESC(_parm, desc) \
__MODULE_INFO(parm, _parm, #_parm ":" desc)
#define MODULE_DEVICE_TABLE(type,name) \
MODULE_GENERIC_TABLE(type##_device,name)
...
...
kernel/module.c
View file @
67ac5b86
...
...
@@ -939,12 +939,12 @@ EXPORT_SYMBOL_GPL(__symbol_get);
/* Change all symbols so that sh_value encodes the pointer directly. */
static
int
simplify_symbols
(
Elf_Shdr
*
sechdrs
,
unsigned
int
symindex
,
unsigned
int
strindex
,
const
char
*
strtab
,
unsigned
int
versindex
,
struct
module
*
mod
)
{
Elf_Sym
*
sym
=
(
void
*
)
sechdrs
[
symindex
].
sh_addr
;
const
char
*
strtab
=
(
char
*
)
sechdrs
[
strindex
].
sh_addr
;
unsigned
int
i
,
n
=
sechdrs
[
symindex
].
sh_size
/
sizeof
(
Elf_Sym
);
int
ret
=
0
;
...
...
@@ -1063,13 +1063,9 @@ static inline int license_is_gpl_compatible(const char *license)
||
strcmp
(
license
,
"Dual MPL/GPL"
)
==
0
);
}
static
void
set_license
(
struct
module
*
mod
,
Elf_Shdr
*
sechdrs
,
int
licenseidx
)
static
void
set_license
(
struct
module
*
mod
,
const
char
*
license
)
{
char
*
license
;
if
(
licenseidx
)
license
=
(
char
*
)
sechdrs
[
licenseidx
].
sh_addr
;
else
if
(
!
license
)
license
=
"unspecified"
;
mod
->
license_gplok
=
license_is_gpl_compatible
(
license
);
...
...
@@ -1080,6 +1076,40 @@ static void set_license(struct module *mod, Elf_Shdr *sechdrs, int licenseidx)
}
}
/* Parse tag=value strings from .modinfo section */
static
char
*
next_string
(
char
*
string
,
unsigned
long
*
secsize
)
{
/* Skip non-zero chars */
while
(
string
[
0
])
{
string
++
;
if
((
*
secsize
)
--
<=
1
)
return
NULL
;
}
/* Skip any zero padding. */
while
(
!
string
[
0
])
{
string
++
;
if
((
*
secsize
)
--
<=
1
)
return
NULL
;
}
return
string
;
}
static
char
*
get_modinfo
(
Elf_Shdr
*
sechdrs
,
unsigned
int
info
,
const
char
*
tag
)
{
char
*
p
;
unsigned
int
taglen
=
strlen
(
tag
);
unsigned
long
size
=
sechdrs
[
info
].
sh_size
;
for
(
p
=
(
char
*
)
sechdrs
[
info
].
sh_addr
;
p
;
p
=
next_string
(
p
,
&
size
))
{
if
(
strncmp
(
p
,
tag
,
taglen
)
==
0
&&
p
[
taglen
]
==
'='
)
return
p
+
taglen
+
1
;
}
return
NULL
;
}
/* Allocate and load the module: note that size of section 0 is always
zero, and we rely on this for optional sections. */
static
struct
module
*
load_module
(
void
__user
*
umod
,
...
...
@@ -1088,9 +1118,9 @@ static struct module *load_module(void __user *umod,
{
Elf_Ehdr
*
hdr
;
Elf_Shdr
*
sechdrs
;
char
*
secstrings
,
*
args
;
unsigned
int
i
,
symindex
,
exportindex
,
strindex
,
setupindex
,
exindex
,
modindex
,
obsparmindex
,
licenseindex
,
gplindex
,
vmag
index
,
char
*
secstrings
,
*
args
,
*
modmagic
,
*
strtab
=
NULL
;
unsigned
int
i
,
symindex
=
0
,
strindex
=
0
,
setupindex
,
exindex
,
exportindex
,
modindex
,
obsparmindex
,
infoindex
,
gpl
index
,
crcindex
,
gplcrcindex
,
versindex
;
long
arglen
;
struct
module
*
mod
;
...
...
@@ -1124,6 +1154,7 @@ static struct module *load_module(void __user *umod,
/* Convenience variables */
sechdrs
=
(
void
*
)
hdr
+
hdr
->
e_shoff
;
secstrings
=
(
void
*
)
hdr
+
sechdrs
[
hdr
->
e_shstrndx
].
sh_offset
;
sechdrs
[
0
].
sh_addr
=
0
;
/* And these should exist, but gcc whinges if we don't init them */
symindex
=
strindex
=
0
;
...
...
@@ -1137,6 +1168,7 @@ static struct module *load_module(void __user *umod,
if
(
sechdrs
[
i
].
sh_type
==
SHT_SYMTAB
)
{
symindex
=
i
;
strindex
=
sechdrs
[
i
].
sh_link
;
strtab
=
(
char
*
)
hdr
+
sechdrs
[
strindex
].
sh_offset
;
}
#ifndef CONFIG_MODULE_UNLOAD
/* Don't load .exit sections */
...
...
@@ -1145,12 +1177,6 @@ static struct module *load_module(void __user *umod,
#endif
}
#ifdef CONFIG_KALLSYMS
/* Keep symbol and string tables for decoding later. */
sechdrs
[
symindex
].
sh_flags
|=
SHF_ALLOC
;
sechdrs
[
strindex
].
sh_flags
|=
SHF_ALLOC
;
#endif
modindex
=
find_sec
(
hdr
,
sechdrs
,
secstrings
,
".gnu.linkonce.this_module"
);
if
(
!
modindex
)
{
...
...
@@ -1168,9 +1194,16 @@ static struct module *load_module(void __user *umod,
setupindex
=
find_sec
(
hdr
,
sechdrs
,
secstrings
,
"__param"
);
exindex
=
find_sec
(
hdr
,
sechdrs
,
secstrings
,
"__ex_table"
);
obsparmindex
=
find_sec
(
hdr
,
sechdrs
,
secstrings
,
"__obsparm"
);
licenseindex
=
find_sec
(
hdr
,
sechdrs
,
secstrings
,
".init.license"
);
vmagindex
=
find_sec
(
hdr
,
sechdrs
,
secstrings
,
"__vermagic"
);
versindex
=
find_sec
(
hdr
,
sechdrs
,
secstrings
,
"__versions"
);
infoindex
=
find_sec
(
hdr
,
sechdrs
,
secstrings
,
".modinfo"
);
/* Don't keep modinfo section */
sechdrs
[
infoindex
].
sh_flags
&=
~
(
unsigned
long
)
SHF_ALLOC
;
#ifdef CONFIG_KALLSYMS
/* Keep symbol and string tables for decoding later. */
sechdrs
[
symindex
].
sh_flags
|=
SHF_ALLOC
;
sechdrs
[
strindex
].
sh_flags
|=
SHF_ALLOC
;
#endif
/* Check module struct version now, before we try to use module. */
if
(
!
check_modstruct_version
(
sechdrs
,
versindex
,
mod
))
{
...
...
@@ -1178,14 +1211,15 @@ static struct module *load_module(void __user *umod,
goto
free_hdr
;
}
modmagic
=
get_modinfo
(
sechdrs
,
infoindex
,
"vermagic"
);
/* This is allowed: modprobe --force will invalidate it. */
if
(
!
vmagindex
)
{
if
(
!
modmagic
)
{
tainted
|=
TAINT_FORCED_MODULE
;
printk
(
KERN_WARNING
"%s: no version magic, tainting kernel.
\n
"
,
mod
->
name
);
}
else
if
(
!
same_magic
(
(
char
*
)
sechdrs
[
vmagindex
].
sh_addr
,
vermagic
))
{
}
else
if
(
!
same_magic
(
modmagic
,
vermagic
))
{
printk
(
KERN_ERR
"%s: version magic '%s' should be '%s'
\n
"
,
mod
->
name
,
(
char
*
)
sechdrs
[
vmagindex
].
sh_addr
,
vermagic
);
mod
->
name
,
modmagic
,
vermagic
);
err
=
-
ENOEXEC
;
goto
free_hdr
;
}
...
...
@@ -1265,11 +1299,11 @@ static struct module *load_module(void __user *umod,
/* Now we've moved module, initialize linked lists, etc. */
module_unload_init
(
mod
);
/* Set up license info based on
contents of
section */
set_license
(
mod
,
sechdrs
,
licenseindex
);
/* Set up license info based on
the info
section */
set_license
(
mod
,
get_modinfo
(
sechdrs
,
infoindex
,
"license"
)
);
/* Fix up syms, so that st_value is a pointer to location. */
err
=
simplify_symbols
(
sechdrs
,
symindex
,
str
index
,
versindex
,
mod
);
err
=
simplify_symbols
(
sechdrs
,
symindex
,
str
tab
,
versindex
,
mod
);
if
(
err
<
0
)
goto
cleanup
;
...
...
@@ -1300,8 +1334,7 @@ static struct module *load_module(void __user *umod,
for
(
i
=
1
;
i
<
hdr
->
e_shnum
;
i
++
)
{
const
char
*
strtab
=
(
char
*
)
sechdrs
[
strindex
].
sh_addr
;
if
(
sechdrs
[
i
].
sh_type
==
SHT_REL
)
err
=
apply_relocate
(
sechdrs
,
strtab
,
symindex
,
i
,
mod
);
err
=
apply_relocate
(
sechdrs
,
strtab
,
symindex
,
i
,
mod
);
else
if
(
sechdrs
[
i
].
sh_type
==
SHT_RELA
)
err
=
apply_relocate_add
(
sechdrs
,
strtab
,
symindex
,
i
,
mod
);
...
...
scripts/modpost.c
View file @
67ac5b86
...
...
@@ -404,9 +404,7 @@ add_header(struct buffer *b)
buf_printf
(
b
,
"#include <linux/vermagic.h>
\n
"
);
buf_printf
(
b
,
"#include <linux/compiler.h>
\n
"
);
buf_printf
(
b
,
"
\n
"
);
buf_printf
(
b
,
"const char vermagic[]
\n
"
);
buf_printf
(
b
,
"__attribute__((section(
\"
__vermagic
\"
))) =
\n
"
);
buf_printf
(
b
,
"VERMAGIC_STRING;
\n
"
);
buf_printf
(
b
,
"MODULE_INFO(vermagic, VERMAGIC_STRING);
\n
"
);
}
/* Record CRCs for unresolved symbols */
...
...
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