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kernel: binder: use kallsyms_lookup_name for internal symbol access

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This commit is contained in:
Simon Fels 2016-12-06 08:26:49 +01:00
commit 2095bebe0b
3 changed files with 47 additions and 44 deletions
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10
kernel/binder/Makefile
View file

@ -1,14 +1,7 @@
ccflags-y += -I$(src)
ifneq ($(KERNELRELEASE),)
ccflags-y += -I$(src) -Wno-int-conversion
obj-m := binder_linux.o
binder_linux-y := deps.o binder.o
$(obj)/deps.o: $(src)/deps.h
$(obj)/deps.h: $(src)/gen_deps.sh
sudo $(src)/gen_deps.sh > $@
else
KERNEL_SRC ?= /lib/modules/$(shell uname -r)/build
all:
@ -19,4 +12,3 @@ install:
clean:
rm -rf deps.h *.o *.ko *.mod.c *.symvers *.order .*.cmd .tmp_versions
endif

63
kernel/binder/deps.c
View file

@ -5,96 +5,125 @@
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include "deps.h"
static struct vm_struct *(*get_vm_area_ptr)(unsigned long, unsigned long) = GET_VM_AREA;
static void (*zap_page_range_ptr)(struct vm_area_struct *, unsigned long, unsigned long, struct zap_details *) = ZAP_PAGE_RANGE;
static int (*map_kernel_range_noflush_ptr)(unsigned long start, unsigned long size, pgprot_t prot, struct page **pages) = MAP_KERNEL_RANGE_NOFLUSH;
static void (*unmap_kernel_range_ptr)(unsigned long, unsigned long) = UNMAP_KERNEL_RANGE;
static struct files_struct *(*get_files_struct_ptr)(struct task_struct *) = GET_FILES_STRUCT;
static void (*put_files_struct_ptr)(struct files_struct *) = PUT_FILES_STRUCT;
static struct sighand_struct *(*__lock_task_sighand_ptr)(struct task_struct *, unsigned long *) = __LOCK_TASK_SIGHAND;
static int (*__alloc_fd_ptr)(struct files_struct *files, unsigned start, unsigned end, unsigned flags) = __ALLOC_FD;
static void (*__fd_install_ptr)(struct files_struct *files, unsigned int fd, struct file *file) = __FD_INSTALL;
static int (*__close_fd_ptr)(struct files_struct *files, unsigned int fd) = __CLOSE_FD;
static int (*can_nice_ptr)(const struct task_struct *, const int) = CAN_NICE;
static int (*security_binder_set_context_mgr_ptr)(struct task_struct *mgr) = SECURITY_BINDER_SET_CONTEXT_MGR;
static int (*security_binder_transaction_ptr)(struct task_struct *from, struct task_struct *to) = SECURITY_BINDER_TRANSACTION;
static int (*security_binder_transfer_binder_ptr)(struct task_struct *from, struct task_struct *to) = SECURITY_BINDER_TRANSFER_BINDER;
static int (*security_binder_transfer_file_ptr)(struct task_struct *from, struct task_struct *to, struct file *file) = SECURITY_BINDER_TRANSFER_FILE;
static struct vm_struct *(*get_vm_area_ptr)(unsigned long, unsigned long) = NULL;
static void (*zap_page_range_ptr)(struct vm_area_struct *, unsigned long, unsigned long, struct zap_details *) = NULL;
static int (*map_kernel_range_noflush_ptr)(unsigned long start, unsigned long size, pgprot_t prot, struct page **pages) = NULL;
static void (*unmap_kernel_range_ptr)(unsigned long, unsigned long) = NULL;
static struct files_struct *(*get_files_struct_ptr)(struct task_struct *) = NULL;
static void (*put_files_struct_ptr)(struct files_struct *) = NULL;
static struct sighand_struct *(*__lock_task_sighand_ptr)(struct task_struct *, unsigned long *) = NULL;
static int (*__alloc_fd_ptr)(struct files_struct *files, unsigned start, unsigned end, unsigned flags) = NULL;
static void (*__fd_install_ptr)(struct files_struct *files, unsigned int fd, struct file *file) = NULL;
static int (*__close_fd_ptr)(struct files_struct *files, unsigned int fd) = NULL;
static int (*can_nice_ptr)(const struct task_struct *, const int) = NULL;
static int (*security_binder_set_context_mgr_ptr)(struct task_struct *mgr) = NULL;
static int (*security_binder_transaction_ptr)(struct task_struct *from, struct task_struct *to) = NULL;
static int (*security_binder_transfer_binder_ptr)(struct task_struct *from, struct task_struct *to) = NULL;
static int (*security_binder_transfer_file_ptr)(struct task_struct *from, struct task_struct *to, struct file *file) = NULL;
struct vm_struct *get_vm_area(unsigned long size, unsigned long flags)
{
if (!get_vm_area_ptr)
get_vm_area_ptr = kallsyms_lookup_name("get_vm_area");
return get_vm_area_ptr(size, flags);
}
void zap_page_range(struct vm_area_struct *vma, unsigned long address, unsigned long size, struct zap_details *details)
{
if (!zap_page_range_ptr)
zap_page_range_ptr = kallsyms_lookup_name("zap_page_range");
zap_page_range_ptr(vma, address, size, details);
}
int map_kernel_range_noflush(unsigned long start, unsigned long size, pgprot_t prot, struct page **pages)
{
if (!map_kernel_range_noflush_ptr)
map_kernel_range_noflush_ptr = kallsyms_lookup_name("map_kernel_range_noflush");
return map_kernel_range_noflush_ptr(start, size, prot, pages);
}
void unmap_kernel_range(unsigned long addr, unsigned long size)
{
if (!unmap_kernel_range_ptr)
unmap_kernel_range_ptr = kallsyms_lookup_name("unmap_kernel_range");
unmap_kernel_range_ptr(addr, size);
}
struct files_struct *get_files_struct(struct task_struct *task)
{
if (!get_files_struct_ptr)
get_files_struct_ptr = kallsyms_lookup_name("get_files_struct");
return get_files_struct_ptr(task);
}
void put_files_struct(struct files_struct *files)
{
if (!put_files_struct_ptr)
put_files_struct_ptr = kallsyms_lookup_name("put_files_struct");
put_files_struct_ptr(files);
}
struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, unsigned long *flags)
{
if (!__lock_task_sighand_ptr)
__lock_task_sighand_ptr = kallsyms_lookup_name("__lock_task_sighand");
return __lock_task_sighand_ptr(tsk, flags);
}
int __alloc_fd(struct files_struct *files, unsigned start, unsigned end, unsigned flags)
{
if (!__alloc_fd_ptr)
__alloc_fd_ptr = kallsyms_lookup_name("__alloc_fd");
return __alloc_fd_ptr(files, start, end, flags);
}
void __fd_install(struct files_struct *files, unsigned int fd, struct file *file)
{
if (!__fd_install_ptr)
__fd_install_ptr = kallsyms_lookup_name("__fd_install");
__fd_install_ptr(files, fd, file);
}
int __close_fd(struct files_struct *files, unsigned int fd)
{
if (!__close_fd_ptr)
__close_fd_ptr = kallsyms_lookup_name("__close_fd_ptr");
return __close_fd_ptr(files, fd);
}
int can_nice(const struct task_struct *p, const int nice)
{
if (!can_nice_ptr)
can_nice_ptr = kallsyms_lookup_name("can_nice");
return can_nice_ptr(p, nice);
}
int security_binder_set_context_mgr(struct task_struct *mgr)
{
if (!security_binder_set_context_mgr_ptr)
security_binder_set_context_mgr_ptr = kallsyms_lookup_name("security_binder_set_context_mgr");
return security_binder_set_context_mgr_ptr(mgr);
}
int security_binder_transaction(struct task_struct *from, struct task_struct *to)
{
if (!security_binder_transaction_ptr)
security_binder_transaction_ptr = kallsyms_lookup_name("security_binder_transaction");
return security_binder_transaction_ptr(from, to);
}
int security_binder_transfer_binder(struct task_struct *from, struct task_struct *to)
{
if (!security_binder_transfer_binder_ptr)
security_binder_transfer_binder_ptr = kallsyms_lookup_name("security_binder_transfer_binder");
return security_binder_transfer_binder_ptr(from, to);
}
int security_binder_transfer_file(struct task_struct *from, struct task_struct *to, struct file *file)
{
if (!security_binder_transfer_file_ptr)
security_binder_transfer_file_ptr = kallsyms_lookup_name("security_binder_transfer_file");
return security_binder_transfer_file_ptr(from, to, file);
}

18
kernel/binder/gen_deps.sh
View file

@ -1,18 +0,0 @@
#!/bin/sh
SYMS="get_vm_area zap_page_range map_kernel_range_noflush unmap_kernel_range "\
"get_files_struct put_files_struct __lock_task_sighand "\
"__alloc_fd __fd_install __close_fd can_nice "\
"security_binder_set_context_mgr security_binder_transaction "\
"security_binder_transfer_binder security_binder_transfer_file"
for sym in $SYMS; do
addr=`cat /proc/kallsyms | grep -Ee '^[0-9a-f]+ T '$sym'$' | sed -e 's/\s.*$//g'`
if [ a$addr = 'a' ]; then
echo "Error: can't find symbol $sym"
exit 1
fi
name=`echo $sym | tr '[:lower:]' '[:upper:]'`
echo "#define $name\t(void *)0x$addr"
done