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Third Party Musl
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6ab444d9
T
Third Party Musl
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体验新版 GitCode,发现更多精彩内容 >>
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6ab444d9
编写于
7月 24, 2011
作者:
R
Rich Felker
浏览文件
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浏览文件
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电子邮件补丁
差异文件
load vdso, if present, into the dso list
上级
f7adc39e
变更
1
显示空白变更内容
内联
并排
Showing
1 changed file
with
31 addition
and
2 deletion
+31
-2
src/ldso/dynlink.c
src/ldso/dynlink.c
+31
-2
未找到文件。
src/ldso/dynlink.c
浏览文件 @
6ab444d9
...
@@ -298,7 +298,7 @@ static struct dso *load_library(const char *name)
...
@@ -298,7 +298,7 @@ static struct dso *load_library(const char *name)
if
(
!
libc
->
prev
)
{
if
(
!
libc
->
prev
)
{
tail
->
next
=
libc
;
tail
->
next
=
libc
;
libc
->
prev
=
tail
;
libc
->
prev
=
tail
;
tail
=
libc
;
tail
=
libc
->
next
?
libc
->
next
:
libc
;
}
}
return
libc
;
return
libc
;
}
}
...
@@ -440,12 +440,15 @@ void *__dynlink(int argc, char **argv, size_t *got)
...
@@ -440,12 +440,15 @@ void *__dynlink(int argc, char **argv, size_t *got)
size_t
*
auxv
,
aux
[
AUX_CNT
]
=
{
0
};
size_t
*
auxv
,
aux
[
AUX_CNT
]
=
{
0
};
size_t
app_dyn
[
DYN_CNT
]
=
{
0
};
size_t
app_dyn
[
DYN_CNT
]
=
{
0
};
size_t
lib_dyn
[
DYN_CNT
]
=
{
0
};
size_t
lib_dyn
[
DYN_CNT
]
=
{
0
};
size_t
vdso_dyn
[
DYN_CNT
]
=
{
0
};
size_t
i
;
size_t
i
;
Phdr
*
phdr
;
Phdr
*
phdr
;
Ehdr
*
ehdr
;
Ehdr
*
ehdr
;
static
struct
dso
builtin_dsos
[
2
];
static
struct
dso
builtin_dsos
[
3
];
struct
dso
*
const
app
=
builtin_dsos
+
0
;
struct
dso
*
const
app
=
builtin_dsos
+
0
;
struct
dso
*
const
lib
=
builtin_dsos
+
1
;
struct
dso
*
const
lib
=
builtin_dsos
+
1
;
struct
dso
*
const
vdso
=
builtin_dsos
+
2
;
size_t
vdso_base
=
0
;
/* Find aux vector just past environ[] */
/* Find aux vector just past environ[] */
for
(
i
=
argc
+
1
;
argv
[
i
];
i
++
)
for
(
i
=
argc
+
1
;
argv
[
i
];
i
++
)
...
@@ -455,6 +458,13 @@ void *__dynlink(int argc, char **argv, size_t *got)
...
@@ -455,6 +458,13 @@ void *__dynlink(int argc, char **argv, size_t *got)
decode_vec
(
auxv
,
aux
,
AUX_CNT
);
decode_vec
(
auxv
,
aux
,
AUX_CNT
);
for
(
i
=
0
;
auxv
[
i
];
i
+=
2
)
{
if
(
auxv
[
i
]
==
AT_SYSINFO_EHDR
)
{
vdso_base
=
auxv
[
i
+
1
];
break
;
}
}
/* Only trust user/env if kernel says we're not suid/sgid */
/* Only trust user/env if kernel says we're not suid/sgid */
if
((
aux
[
0
]
&
0x7800
)
!=
0x7800
||
aux
[
AT_UID
]
!=
aux
[
AT_EUID
]
if
((
aux
[
0
]
&
0x7800
)
!=
0x7800
||
aux
[
AT_UID
]
!=
aux
[
AT_EUID
]
||
aux
[
AT_GID
]
!=
aux
[
AT_EGID
])
{
||
aux
[
AT_GID
]
!=
aux
[
AT_EGID
])
{
...
@@ -495,6 +505,25 @@ void *__dynlink(int argc, char **argv, size_t *got)
...
@@ -495,6 +505,25 @@ void *__dynlink(int argc, char **argv, size_t *got)
.
relocated
=
1
.
relocated
=
1
};
};
if
(
vdso_base
)
{
ehdr
=
(
void
*
)
vdso_base
;
phdr
=
(
void
*
)(
vdso_base
+
ehdr
->
e_phoff
);
for
(
i
=
ehdr
->
e_phnum
;
i
;
i
--
,
phdr
=
(
void
*
)((
char
*
)
phdr
+
ehdr
->
e_phentsize
))
{
if
(
phdr
->
p_type
==
PT_DYNAMIC
)
vdso
->
dynv
=
(
void
*
)(
vdso_base
+
phdr
->
p_offset
);
if
(
phdr
->
p_type
==
PT_LOAD
)
vdso
->
base
=
(
void
*
)(
vdso_base
-
phdr
->
p_vaddr
+
phdr
->
p_offset
);
}
decode_vec
(
vdso
->
dynv
,
vdso_dyn
,
DYN_CNT
);
vdso
->
syms
=
(
void
*
)(
vdso
->
base
+
vdso_dyn
[
DT_SYMTAB
]);
vdso
->
hashtab
=
(
void
*
)(
vdso
->
base
+
vdso_dyn
[
DT_HASH
]);
vdso
->
strings
=
(
void
*
)(
vdso
->
base
+
vdso_dyn
[
DT_STRTAB
]);
vdso
->
name
=
"linux-gate.so.1"
;
vdso
->
prev
=
lib
;
lib
->
next
=
vdso
;
}
/* Relocate the dynamic linker/libc */
/* Relocate the dynamic linker/libc */
do_relocs
((
void
*
)
aux
[
AT_BASE
],
(
void
*
)(
aux
[
AT_BASE
]
+
lib_dyn
[
DT_REL
]),
do_relocs
((
void
*
)
aux
[
AT_BASE
],
(
void
*
)(
aux
[
AT_BASE
]
+
lib_dyn
[
DT_REL
]),
lib_dyn
[
DT_RELSZ
],
2
,
lib
->
syms
,
lib
->
strings
,
app
);
lib_dyn
[
DT_RELSZ
],
2
,
lib
->
syms
,
lib
->
strings
,
app
);
...
...
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