3rd-party/linux-kernel-module-cheat
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kernel modules: add a quick scull port from LDD3

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* fix fops.c on both kernels:
  * 5.9: the out of space error code was 1 not 8
  * 6.6: for whatever reason we can't read the user buffer as before on the
         diagnostic print, it leads to segfault and oops
* create memfile.c which is like fops.c but of unlimited size
This commit is contained in:
Ciro Santilli
2025-04-28 15:23:44 +01:00
parent 3d84eccc43
commit e4847e4b40
16 changed files with 2133 additions and 50 deletions
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8
kernel_modules/seq_file.c
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@@ -17,7 +17,7 @@ static struct dentry *debugfs_file;
/* Called at the beginning of every read.
*
* The return value is passsed to the first show.
* The return value is passed to the first show.
* It normally represents the current position of the iterator.
* It could be any struct, but we use just a single integer here.
*
@@ -28,7 +28,7 @@ static void *start(struct seq_file *s, loff_t *pos)
{
loff_t *spos;
pr_info("start pos = %llx\n", (unsigned long long)*pos);
pr_info("start pos=%llx\n", (unsigned long long)*pos);
spos = kmalloc(sizeof(loff_t), GFP_KERNEL);
if (!spos || *pos >= max)
return NULL;
@@ -46,7 +46,7 @@ static void *next(struct seq_file *s, void *v, loff_t *pos)
loff_t *spos;
spos = v;
pr_info("next pos = %llx\n", (unsigned long long)*pos);
pr_info("next pos=%llx\n", (unsigned long long)*pos);
if (*pos >= max)
return NULL;
*pos = ++*spos;
@@ -66,7 +66,7 @@ static int show(struct seq_file *s, void *v)
loff_t *spos;
spos = v;
pr_info("show pos = %llx\n", (unsigned long long)*spos);
pr_info("show pos=%llx\n", (unsigned long long)*spos);
seq_printf(s, "%llx\n", (long long unsigned)*spos);
return 0;
}