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SmartisanOS_Kernel_Source/kernel/exec_domain.c at master · morgangu/SmartisanOS_Kernel_Source · GitHub
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exec_domain.c
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SmartisanOS_Kernel_Source
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kernel
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exec_domain.c
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/*
* Handling of different ABIs (personalities).
*
* We group personalities into execution domains which have their
* own handlers for kernel entry points, signal mapping, etc...
*
* 2001-05-06 Complete rewrite, Christoph Hellwig (hch@infradead.org)
*/
#include
<linux/init.h>
#include
<linux/kernel.h>
#include
<linux/kmod.h>
#include
<linux/module.h>
#include
<linux/personality.h>
#include
<linux/proc_fs.h>
#include
<linux/sched.h>
#include
<linux/seq_file.h>
#include
<linux/syscalls.h>
#include
<linux/sysctl.h>
#include
<linux/types.h>
#include
<linux/fs_struct.h>
static
void
default_handler
(
int
,
struct
pt_regs
*
);
static
struct
exec_domain
*
exec_domains
=
&
default_exec_domain
;
static
DEFINE_RWLOCK
(
exec_domains_lock
);
static
unsigned long
ident_map
[
32
]
=
{
0
,
1
,
2
,
3
,
4
,
5
,
6
,
7
,
8
,
9
,
10
,
11
,
12
,
13
,
14
,
15
,
16
,
17
,
18
,
19
,
20
,
21
,
22
,
23
,
24
,
25
,
26
,
27
,
28
,
29
,
30
,
31
};
struct
exec_domain
default_exec_domain
=
{
.
name
=
"Linux"
,
/* name */
.
handler
=
default_handler
,
/* lcall7 causes a seg fault. */
.
pers_low
=
0
,
/* PER_LINUX personality. */
.
pers_high
=
0
,
/* PER_LINUX personality. */
.
signal_map
=
ident_map
,
/* Identity map signals. */
.
signal_invmap
=
ident_map
,
/* - both ways. */
};
static
void
default_handler
(
int
segment
,
struct
pt_regs
*
regp
)
{
set_personality
(
0
);
if
(
current_thread_info
()
->
exec_domain
->
handler
!=
default_handler
)
current_thread_info
()
->
exec_domain
->
handler
(
segment
,
regp
);
else
send_sig
(
SIGSEGV
,
current
,
1
);
}
static
struct
exec_domain
*
lookup_exec_domain
(
unsigned
int
personality
)
{
unsigned
int
pers
=
personality
(
personality
);
struct
exec_domain
*
ep
;
read_lock
(
&
exec_domains_lock
);
for
(
ep
=
exec_domains
;
ep
;
ep
=
ep
->
next
) {
if
(
pers
>=
ep
->
pers_low
&&
pers
<=
ep
->
pers_high
)
if
(
try_module_get
(
ep
->
module
))
goto
out
;
}
#ifdef
CONFIG_MODULES
read_unlock
(
&
exec_domains_lock
);
request_module
(
"personality-%d"
,
pers
);
read_lock
(
&
exec_domains_lock
);
for
(
ep
=
exec_domains
;
ep
;
ep
=
ep
->
next
) {
if
(
pers
>=
ep
->
pers_low
&&
pers
<=
ep
->
pers_high
)
if
(
try_module_get
(
ep
->
module
))
goto
out
;
}
#endif
ep
=
&
default_exec_domain
;
out
:
read_unlock
(
&
exec_domains_lock
);
return
(
ep
);
}
int
register_exec_domain
(
struct
exec_domain
*
ep
)
{
struct
exec_domain
*
tmp
;
int
err
=
-
EBUSY
;
if
(
ep
==
NULL
)
return
-
EINVAL
;
if
(
ep
->
next
!=
NULL
)
return
-
EBUSY
;
write_lock
(
&
exec_domains_lock
);
for
(
tmp
=
exec_domains
;
tmp
;
tmp
=
tmp
->
next
) {
if
(
tmp
==
ep
)
goto
out
;
}
ep
->
next
=
exec_domains
;
exec_domains
=
ep
;
err
=
0
;
out
:
write_unlock
(
&
exec_domains_lock
);
return
(
err
);
}
int
unregister_exec_domain
(
struct
exec_domain
*
ep
)
{
struct
exec_domain
*
*
epp
;
epp
=
&
exec_domains
;
write_lock
(
&
exec_domains_lock
);
for
(
epp
=
&
exec_domains
;
*
epp
;
epp
=
&
(
*
epp
)
->
next
) {
if
(
ep
==
*
epp
)
goto
unregister
;
}
write_unlock
(
&
exec_domains_lock
);
return
-
EINVAL
;
unregister
:
*
epp
=
ep
->
next
;
ep
->
next
=
NULL
;
write_unlock
(
&
exec_domains_lock
);
return
0
;
}
int
__set_personality
(
unsigned
int
personality
)
{
struct
exec_domain
*
oep
=
current_thread_info
()
->
exec_domain
;
current_thread_info
()
->
exec_domain
=
lookup_exec_domain
(
personality
);
current
->
personality
=
personality
;
module_put
(
oep
->
module
);
return
0
;
}
#ifdef
CONFIG_PROC_FS
static
int
execdomains_proc_show
(
struct
seq_file
*
m
,
void
*
v
)
{
struct
exec_domain
*
ep
;
read_lock
(
&
exec_domains_lock
);
for
(
ep
=
exec_domains
;
ep
;
ep
=
ep
->
next
)
seq_printf
(
m
,
"%d-%d\t%-16s\t[%s]\n"
,
ep
->
pers_low
,
ep
->
pers_high
,
ep
->
name
,
module_name
(
ep
->
module
));
read_unlock
(
&
exec_domains_lock
);
return
0
;
}
static
int
execdomains_proc_open
(
struct
inode
*
inode
,
struct
file
*
file
)
{
return
single_open
(
file
,
execdomains_proc_show
,
NULL
);
}
static
const
struct
file_operations
execdomains_proc_fops
=
{
.
open
=
execdomains_proc_open
,
.
read
=
seq_read
,
.
llseek
=
seq_lseek
,
.
release
=
single_release
,
};
static
int
__init
proc_execdomains_init
(
void
)
{
proc_create
(
"execdomains"
,
0
,
NULL
,
&
execdomains_proc_fops
);
return
0
;
}
module_init
(
proc_execdomains_init
);
#endif
SYSCALL_DEFINE1
(
personality
,
unsigned
int
,
personality
)
{
unsigned
int
old
=
current
->
personality
;
if
(
personality
!=
0xffffffff
)
set_personality
(
personality
);
return
old
;
}
EXPORT_SYMBOL
(
register_exec_domain
);
EXPORT_SYMBOL
(
unregister_exec_domain
);
EXPORT_SYMBOL
(
__set_personality
);
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