3rd-party/linux-kernel-module-cheat
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Create debugfs files directly on debugfs root instead of a subdirectory

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This commit is contained in:
Ciro Santilli
2017-07-14 11:24:52 +01:00
parent d4ed593451
commit 1918c4fdfe
10 changed files with 21 additions and 26 deletions
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7
kernel_module/anonymous_inode.c
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@@ -24,7 +24,7 @@ which reduces namespace pollution.
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
static struct dentry *dir; static struct dentry *debugfs_file;
static ssize_t read(struct file *filp, char __user *buf, size_t len, loff_t *off) static ssize_t read(struct file *filp, char __user *buf, size_t len, loff_t *off)
{ {
@@ -72,14 +72,13 @@ static const struct file_operations fops_ioctl = {
static int myinit(void) static int myinit(void)
{ {
dir = debugfs_create_dir("lkmc_anonymous_inode", 0); debugfs_file = debugfs_create_file("lkmc_anonymous_inode", 0, NULL, NULL, &fops_ioctl);
debugfs_create_file("f", 0, dir, NULL, &fops_ioctl);
return 0; return 0;
} }
static void myexit(void) static void myexit(void)
{ {
debugfs_remove_recursive(dir); debugfs_remove(debugfs_file);
} }
module_init(myinit) module_init(myinit)

7
kernel_module/fops.c
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@@ -28,7 +28,7 @@ Here we use debugfs.
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
static struct dentry *dir; static struct dentry *debugfs_file;
static char data[] = {'a', 'b', 'c', 'd'}; static char data[] = {'a', 'b', 'c', 'd'};
static int open(struct inode *inode, struct file *filp) static int open(struct inode *inode, struct file *filp)
@@ -143,14 +143,13 @@ static const struct file_operations fops = {
static int myinit(void) static int myinit(void)
{ {
dir = debugfs_create_dir("lkmc_fops", 0); debugfs_file = debugfs_create_file("lkmc_fops", S_IRUSR | S_IWUSR, NULL, NULL, &fops);
debugfs_create_file("f", S_IRUSR | S_IWUSR, dir, NULL, &fops);
return 0; return 0;
} }
static void myexit(void) static void myexit(void)
{ {
debugfs_remove_recursive(dir); debugfs_remove_recursive(debugfs_file);
} }
module_init(myinit) module_init(myinit)

7
kernel_module/ioctl.c
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@@ -28,7 +28,7 @@ Documentation/ioctl/ioctl-number.txt has some info:
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
static struct dentry *dir; static struct dentry *debugfs_file;
static long unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long argp) static long unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long argp)
{ {
@@ -76,17 +76,16 @@ static const struct file_operations fops = {
static int myinit(void) static int myinit(void)
{ {
dir = debugfs_create_dir("lkmc_ioctl", 0);
/* ioctl permissions are not automatically restricted by rwx as for read / write, /* ioctl permissions are not automatically restricted by rwx as for read / write,
* but we could of course implement that ourselves: * but we could of course implement that ourselves:
* https://stackoverflow.com/questions/29891803/user-permission-check-on-ioctl-command */ * https://stackoverflow.com/questions/29891803/user-permission-check-on-ioctl-command */
debugfs_create_file("f", 0, dir, NULL, &fops); debugfs_file = debugfs_create_file("lkmc_ioctl", 0, NULL, NULL, &fops);
return 0; return 0;
} }
static void myexit(void) static void myexit(void)
{ {
debugfs_remove_recursive(dir); debugfs_remove(debugfs_file);
} }
module_init(myinit) module_init(myinit)

8
kernel_module/poll.c
View File

@@ -24,7 +24,7 @@ MODULE_LICENSE("GPL");
static char readbuf[1024]; static char readbuf[1024];
static size_t readbuflen; static size_t readbuflen;
static struct dentry *dir; static struct dentry *debugfs_file;
static struct task_struct *kthread; static struct task_struct *kthread;
static wait_queue_head_t waitqueue; static wait_queue_head_t waitqueue;
@@ -74,8 +74,8 @@ static const struct file_operations fops = {
static int myinit(void) static int myinit(void)
{ {
dir = debugfs_create_dir("lkmc_poll", 0); debugfs_file = debugfs_create_file(
debugfs_create_file("f", S_IRUSR | S_IWUSR, dir, NULL, &fops); "lkmc_poll", S_IRUSR | S_IWUSR, NULL, NULL, &fops);
init_waitqueue_head(&waitqueue); init_waitqueue_head(&waitqueue);
kthread = kthread_create(kthread_func, NULL, "mykthread"); kthread = kthread_create(kthread_func, NULL, "mykthread");
wake_up_process(kthread); wake_up_process(kthread);
@@ -85,7 +85,7 @@ static int myinit(void)
static void myexit(void) static void myexit(void)
{ {
kthread_stop(kthread); kthread_stop(kthread);
debugfs_remove_recursive(dir); debugfs_remove(debugfs_file);
} }
module_init(myinit) module_init(myinit)

6
kernel_module/seq_file_single.c
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@@ -44,11 +44,7 @@ static int myinit(void)
{ {
debugfs_file = debugfs_create_file( debugfs_file = debugfs_create_file(
"lkmc_seq_file_single", S_IRUSR, NULL, NULL, &fops); "lkmc_seq_file_single", S_IRUSR, NULL, NULL, &fops);
if (debugfs_file) { return 0;
return 0;
} else {
return -EINVAL;
}
} }
static void myexit(void) static void myexit(void)

3
rootfs_overlay/anonymous_inode.sh
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@@ -1,6 +1,5 @@
#!/bin/sh #!/bin/sh
set -e set -e
insmod /anonymous_inode.ko insmod /anonymous_inode.ko
cd /sys/kernel/debug/lkmc_anonymous_inode/ /anonymous_inode.out /sys/kernel/debug/lkmc_anonymous_inode
/anonymous_inode.out f
rmmod anonymous_inode rmmod anonymous_inode

3
rootfs_overlay/ioctl.sh
View File

@@ -1,6 +1,5 @@
#!/bin/sh #!/bin/sh
set -e set -e
insmod /ioctl.ko insmod /ioctl.ko
cd /sys/kernel/debug/lkmc_ioctl/ /ioctl.out /sys/kernel/debug/lkmc_ioctl
/ioctl.out f
rmmod ioctl rmmod ioctl

2
rootfs_overlay/poll.sh
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@@ -1,3 +1,3 @@
#!/bin/sh #!/bin/sh
insmod /poll.ko insmod /poll.ko
/poll.out /sys/kernel/debug/lkmc_poll/f /poll.out /sys/kernel/debug/lkmc_poll

2
rootfs_overlay/seq_file.sh
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@@ -25,3 +25,5 @@ dd if='lkmc_seq_file' bs=1 count=2 skip=2 status=none
dd if='lkmc_seq_file' bs=4 count=1 skip=0 status=none dd if='lkmc_seq_file' bs=4 count=1 skip=0 status=none
# => 0 # => 0
# => 1 # => 1
rmmod seq_file

2
rootfs_overlay/seq_file_single.sh
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@@ -8,3 +8,5 @@ cat 'lkmc_seq_file_single'
dd if='lkmc_seq_file_single' bs=1 count=3 skip=1 dd if='lkmc_seq_file_single' bs=1 count=3 skip=1
# => b # => b
# => c # => c
rmmod seq_file_single