|
Lines 1028-1033
out_free_ph:
Link Here
|
| 1028 |
static int load_elf_library(struct file *file) |
1028 |
static int load_elf_library(struct file *file) |
| 1029 |
{ |
1029 |
{ |
| 1030 |
struct elf_phdr *elf_phdata; |
1030 |
struct elf_phdr *elf_phdata; |
|
|
1031 |
struct elf_phdr *eppnt; |
| 1031 |
unsigned long elf_bss, bss, len; |
1032 |
unsigned long elf_bss, bss, len; |
| 1032 |
int retval, error, i, j; |
1033 |
int retval, error, i, j; |
| 1033 |
struct elfhdr elf_ex; |
1034 |
struct elfhdr elf_ex; |
|
Lines 1051-1094
static int load_elf_library(struct file
Link Here
|
| 1051 |
/* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ |
1052 |
/* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ |
| 1052 |
|
1053 |
|
| 1053 |
error = -ENOMEM; |
1054 |
error = -ENOMEM; |
| 1054 |
elf_phdata = (struct elf_phdr *) kmalloc(j, GFP_KERNEL); |
1055 |
elf_phdata = kmalloc(j, GFP_KERNEL); |
| 1055 |
if (!elf_phdata) |
1056 |
if (!elf_phdata) |
| 1056 |
goto out; |
1057 |
goto out; |
| 1057 |
|
1058 |
|
|
|
1059 |
eppnt = elf_phdata; |
| 1058 |
error = -ENOEXEC; |
1060 |
error = -ENOEXEC; |
| 1059 |
retval = kernel_read(file, elf_ex.e_phoff, (char *) elf_phdata, j); |
1061 |
retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); |
| 1060 |
if (retval != j) |
1062 |
if (retval != j) |
| 1061 |
goto out_free_ph; |
1063 |
goto out_free_ph; |
| 1062 |
|
1064 |
|
| 1063 |
for (j = 0, i = 0; i<elf_ex.e_phnum; i++) |
1065 |
for (j = 0, i = 0; i<elf_ex.e_phnum; i++) |
| 1064 |
if ((elf_phdata + i)->p_type == PT_LOAD) j++; |
1066 |
if ((eppnt + i)->p_type == PT_LOAD) |
|
|
1067 |
j++; |
| 1065 |
if (j != 1) |
1068 |
if (j != 1) |
| 1066 |
goto out_free_ph; |
1069 |
goto out_free_ph; |
| 1067 |
|
1070 |
|
| 1068 |
while (elf_phdata->p_type != PT_LOAD) elf_phdata++; |
1071 |
while (eppnt->p_type != PT_LOAD) |
|
|
1072 |
eppnt++; |
| 1069 |
|
1073 |
|
| 1070 |
/* Now use mmap to map the library into memory. */ |
1074 |
/* Now use mmap to map the library into memory. */ |
| 1071 |
down_write(¤t->mm->mmap_sem); |
1075 |
down_write(¤t->mm->mmap_sem); |
| 1072 |
error = do_mmap(file, |
1076 |
error = do_mmap(file, |
| 1073 |
ELF_PAGESTART(elf_phdata->p_vaddr), |
1077 |
ELF_PAGESTART(eppnt->p_vaddr), |
| 1074 |
(elf_phdata->p_filesz + |
1078 |
(eppnt->p_filesz + |
| 1075 |
ELF_PAGEOFFSET(elf_phdata->p_vaddr)), |
1079 |
ELF_PAGEOFFSET(eppnt->p_vaddr)), |
| 1076 |
PROT_READ | PROT_WRITE | PROT_EXEC, |
1080 |
PROT_READ | PROT_WRITE | PROT_EXEC, |
| 1077 |
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, |
1081 |
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, |
| 1078 |
(elf_phdata->p_offset - |
1082 |
(eppnt->p_offset - |
| 1079 |
ELF_PAGEOFFSET(elf_phdata->p_vaddr))); |
1083 |
ELF_PAGEOFFSET(eppnt->p_vaddr))); |
| 1080 |
up_write(¤t->mm->mmap_sem); |
1084 |
up_write(¤t->mm->mmap_sem); |
| 1081 |
if (error != ELF_PAGESTART(elf_phdata->p_vaddr)) |
1085 |
if (error != ELF_PAGESTART(eppnt->p_vaddr)) |
| 1082 |
goto out_free_ph; |
1086 |
goto out_free_ph; |
| 1083 |
|
1087 |
|
| 1084 |
elf_bss = elf_phdata->p_vaddr + elf_phdata->p_filesz; |
1088 |
elf_bss = eppnt->p_vaddr + eppnt->p_filesz; |
| 1085 |
if (padzero(elf_bss)) { |
1089 |
if (padzero(elf_bss)) { |
| 1086 |
error = -EFAULT; |
1090 |
error = -EFAULT; |
| 1087 |
goto out_free_ph; |
1091 |
goto out_free_ph; |
| 1088 |
} |
1092 |
} |
| 1089 |
|
1093 |
|
| 1090 |
len = ELF_PAGESTART(elf_phdata->p_filesz + elf_phdata->p_vaddr + ELF_MIN_ALIGN - 1); |
1094 |
len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + ELF_MIN_ALIGN - 1); |
| 1091 |
bss = elf_phdata->p_memsz + elf_phdata->p_vaddr; |
1095 |
bss = eppnt->p_memsz + eppnt->p_vaddr; |
| 1092 |
if (bss > len) { |
1096 |
if (bss > len) { |
| 1093 |
down_write(¤t->mm->mmap_sem); |
1097 |
down_write(¤t->mm->mmap_sem); |
| 1094 |
do_brk(len, bss - len); |
1098 |
do_brk(len, bss - len); |
