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How to use do_mmap() in kernel module
Use do_mmap() in Linux device driverHow do you set, clear, and toggle a single bit?How to symlink a file in Linux?How do I find all files containing specific text on Linux?“scripts recordmcount: Syntax error” when I try to build a linux kernel module on a 64-bit 3.9 kernelLinux Kernel Module (*.ko) compatibility between kernelsCompiling linux kernel with nvccHow to print linux kernel version number in kernel modulecompile a static kernel driver to modulecompile linux kernel module with mkfileFailied to building Linux kernel module for specific kernel version
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I would like to use do_mmap() in a kernel module. According to this question this should be possible.
Here is a minimal non-working example:
hp_km.c:
#include <linux/module.h>
#include <linux/mm.h>
MODULE_LICENSE("GPL");
static int __init hp_km_init(void)
do_mmap(0, 0, 0, 0, 0, 0, 0, 0, 0);
return 0;
static void __exit hp_km_exit(void)
module_init(hp_km_init);
module_exit(hp_km_exit);
Makefile:
obj-m += hp_km.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
Running make results in WARNING: "do_mmap" [...] undefined!
What do I need to change in hp_km.cor Makefile to make this work?
c linux linux-kernel kernel-module
asked Mar 23 at 19:51
andreasandreas
433
add a comment |
I would like to use do_mmap() in a kernel module. According to this question this should be possible.
Here is a minimal non-working example:
hp_km.c:
#include <linux/module.h>
#include <linux/mm.h>
MODULE_LICENSE("GPL");
static int __init hp_km_init(void)
do_mmap(0, 0, 0, 0, 0, 0, 0, 0, 0);
return 0;
static void __exit hp_km_exit(void)
module_init(hp_km_init);
module_exit(hp_km_exit);
Makefile:
obj-m += hp_km.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
Running make results in WARNING: "do_mmap" [...] undefined!
What do I need to change in hp_km.cor Makefile to make this work?
c linux linux-kernel kernel-module
asked Mar 23 at 19:51
andreasandreas
433
3
I think you have to export the symbol first. You can do that by addingEXPORT_SYMBOL(do_mmap);in the mmap.c file below the definition of the function and then recompile the kernel. You can use any of the functions that have been exported usingEXPORT_SYMBOL, but note howdo_mmaphas not been exported.
– Hadi Brais
Mar 23 at 21:02
add a comment |
I would like to use do_mmap() in a kernel module. According to this question this should be possible.
Here is a minimal non-working example:
hp_km.c:
#include <linux/module.h>
#include <linux/mm.h>
MODULE_LICENSE("GPL");
static int __init hp_km_init(void)
do_mmap(0, 0, 0, 0, 0, 0, 0, 0, 0);
return 0;
static void __exit hp_km_exit(void)
module_init(hp_km_init);
module_exit(hp_km_exit);
Makefile:
obj-m += hp_km.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
Running make results in WARNING: "do_mmap" [...] undefined!
What do I need to change in hp_km.cor Makefile to make this work?
c linux linux-kernel kernel-module
asked Mar 23 at 19:51
andreasandreas
433
I would like to use do_mmap() in a kernel module. According to this question this should be possible.
Here is a minimal non-working example:
hp_km.c:
#include <linux/module.h>
#include <linux/mm.h>
MODULE_LICENSE("GPL");
static int __init hp_km_init(void)
do_mmap(0, 0, 0, 0, 0, 0, 0, 0, 0);
return 0;
static void __exit hp_km_exit(void)
module_init(hp_km_init);
module_exit(hp_km_exit);
Makefile:
obj-m += hp_km.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
Running make results in WARNING: "do_mmap" [...] undefined!
What do I need to change in hp_km.cor Makefile to make this work?
c linux linux-kernel kernel-module
c linux linux-kernel kernel-module
asked Mar 23 at 19:51
andreasandreas
433
asked Mar 23 at 19:51
andreasandreas
433
asked Mar 23 at 19:51
andreasandreas
433
asked Mar 23 at 19:51
andreasandreas
433
asked Mar 23 at 19:51
andreasandreas
433
433
3
I think you have to export the symbol first. You can do that by addingEXPORT_SYMBOL(do_mmap);in the mmap.c file below the definition of the function and then recompile the kernel. You can use any of the functions that have been exported usingEXPORT_SYMBOL, but note howdo_mmaphas not been exported.
– Hadi Brais
Mar 23 at 21:02
add a comment |
3
I think you have to export the symbol first. You can do that by addingEXPORT_SYMBOL(do_mmap);in the mmap.c file below the definition of the function and then recompile the kernel. You can use any of the functions that have been exported usingEXPORT_SYMBOL, but note howdo_mmaphas not been exported.
– Hadi Brais
Mar 23 at 21:02
3
3
I think you have to export the symbol first. You can do that by adding
EXPORT_SYMBOL(do_mmap); in the mmap.c file below the definition of the function and then recompile the kernel. You can use any of the functions that have been exported using EXPORT_SYMBOL, but note how do_mmap has not been exported.– Hadi Brais
Mar 23 at 21:02
I think you have to export the symbol first. You can do that by adding
EXPORT_SYMBOL(do_mmap); in the mmap.c file below the definition of the function and then recompile the kernel. You can use any of the functions that have been exported using EXPORT_SYMBOL, but note how do_mmap has not been exported.– Hadi Brais
Mar 23 at 21:02
add a comment |
1 Answer
1
active
oldest
votes
In addition to rebuild the kernel, you can also use kallsyms_lookup_name to find the address corresponding to the symbol
such as below:
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/kallsyms.h>
MODULE_LICENSE("GPL");
unsigned long (*orig_do_mmap)(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
unsigned long flags, vm_flags_t vm_flags,
unsigned long pgoff, unsigned long *populate,
struct list_head *uf);
static int __init hp_km_init(void)
orig_do_mmap = (void*)kallsyms_lookup_name("do_mmap");
if (orig_do_mmap == NULL)
return -EINVAL;
orig_do_mmap(0, 0, 0, 0, 0, 0, 0, 0, 0);
return 0;
static void __exit hp_km_exit(void)
module_init(hp_km_init);
module_exit(hp_km_exit);
answered Mar 24 at 7:46
ccxxshowccxxshow
68425
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
In addition to rebuild the kernel, you can also use kallsyms_lookup_name to find the address corresponding to the symbol
such as below:
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/kallsyms.h>
MODULE_LICENSE("GPL");
unsigned long (*orig_do_mmap)(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
unsigned long flags, vm_flags_t vm_flags,
unsigned long pgoff, unsigned long *populate,
struct list_head *uf);
static int __init hp_km_init(void)
orig_do_mmap = (void*)kallsyms_lookup_name("do_mmap");
if (orig_do_mmap == NULL)
return -EINVAL;
orig_do_mmap(0, 0, 0, 0, 0, 0, 0, 0, 0);
return 0;
static void __exit hp_km_exit(void)
module_init(hp_km_init);
module_exit(hp_km_exit);
answered Mar 24 at 7:46
ccxxshowccxxshow
68425
add a comment |
In addition to rebuild the kernel, you can also use kallsyms_lookup_name to find the address corresponding to the symbol
such as below:
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/kallsyms.h>
MODULE_LICENSE("GPL");
unsigned long (*orig_do_mmap)(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
unsigned long flags, vm_flags_t vm_flags,
unsigned long pgoff, unsigned long *populate,
struct list_head *uf);
static int __init hp_km_init(void)
orig_do_mmap = (void*)kallsyms_lookup_name("do_mmap");
if (orig_do_mmap == NULL)
return -EINVAL;
orig_do_mmap(0, 0, 0, 0, 0, 0, 0, 0, 0);
return 0;
static void __exit hp_km_exit(void)
module_init(hp_km_init);
module_exit(hp_km_exit);
answered Mar 24 at 7:46
ccxxshowccxxshow
68425
add a comment |
In addition to rebuild the kernel, you can also use kallsyms_lookup_name to find the address corresponding to the symbol
such as below:
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/kallsyms.h>
MODULE_LICENSE("GPL");
unsigned long (*orig_do_mmap)(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
unsigned long flags, vm_flags_t vm_flags,
unsigned long pgoff, unsigned long *populate,
struct list_head *uf);
static int __init hp_km_init(void)
orig_do_mmap = (void*)kallsyms_lookup_name("do_mmap");
if (orig_do_mmap == NULL)
return -EINVAL;
orig_do_mmap(0, 0, 0, 0, 0, 0, 0, 0, 0);
return 0;
static void __exit hp_km_exit(void)
module_init(hp_km_init);
module_exit(hp_km_exit);
answered Mar 24 at 7:46
ccxxshowccxxshow
68425
In addition to rebuild the kernel, you can also use kallsyms_lookup_name to find the address corresponding to the symbol
such as below:
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/kallsyms.h>
MODULE_LICENSE("GPL");
unsigned long (*orig_do_mmap)(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
unsigned long flags, vm_flags_t vm_flags,
unsigned long pgoff, unsigned long *populate,
struct list_head *uf);
static int __init hp_km_init(void)
orig_do_mmap = (void*)kallsyms_lookup_name("do_mmap");
if (orig_do_mmap == NULL)
return -EINVAL;
orig_do_mmap(0, 0, 0, 0, 0, 0, 0, 0, 0);
return 0;
static void __exit hp_km_exit(void)
module_init(hp_km_init);
module_exit(hp_km_exit);
answered Mar 24 at 7:46
ccxxshowccxxshow
68425
answered Mar 24 at 7:46
ccxxshowccxxshow
68425
answered Mar 24 at 7:46
ccxxshowccxxshow
68425
answered Mar 24 at 7:46
ccxxshowccxxshow
68425
68425
add a comment |
add a comment |
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3
I think you have to export the symbol first. You can do that by adding
EXPORT_SYMBOL(do_mmap);in the mmap.c file below the definition of the function and then recompile the kernel. You can use any of the functions that have been exported usingEXPORT_SYMBOL, but note howdo_mmaphas not been exported.– Hadi Brais
Mar 23 at 21:02