Re: [PATCH v3 12/22] vfs: define kernel_read_file_from_path

[Kees Cook]

On Wed, Feb 3, 2016 at 11:06 AM, Mimi Zohar  wrote:
> This patch defines kernel_read_file_from_path(), a wrapper for the VFS
> common kernel_read_file().
>
> Changelog:
> - Separated from the IMA patch
>
> Signed-off-by: Mimi Zohar 

Acked-by: Kees Cook 

-Kees

> ---
>  fs/exec.c  | 22 ++
>  include/linux/fs.h |  2 ++
>  2 files changed, 24 insertions(+)
>
> diff --git a/fs/exec.c b/fs/exec.c
> index cd2b5b2..5629958 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -884,6 +884,28 @@ out:
>  }
>  EXPORT_SYMBOL_GPL(kernel_read_file);
>
> +int kernel_read_file_from_path(char *path, void **buf, loff_t *size,
> +  loff_t max_size, enum kernel_read_file_id id)
> +{
> +   struct file *file;
> +   int ret;
> +
> +   if (!path || !*path)
> +   return -EINVAL;
> +
> +   file = filp_open(path, O_RDONLY, 0);
> +   if (IS_ERR(file)) {
> +   ret = PTR_ERR(file);
> +   pr_err("Unable to open file: %s (%d)", path, ret);
> +   return ret;
> +   }
> +
> +   ret = kernel_read_file(file, buf, size, max_size, id);
> +   fput(file);
> +   return ret;
> +}
> +EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
> +
>  ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t 
> len)
>  {
> ssize_t res = vfs_read(file, (void __user *)addr, len, );
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 1458ca5..962c491 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2533,6 +2533,8 @@ enum kernel_read_file_id {
>  extern int kernel_read(struct file *, loff_t, char *, unsigned long);
>  extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
> enum kernel_read_file_id);
> +extern int kernel_read_file_from_path(char *, void **, loff_t *, loff_t,
> + enum kernel_read_file_id);
>  extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t);
>  extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
>  extern struct file * open_exec(const char *);
> --
> 2.1.0
>



-- 
Kees Cook
Chrome OS & Brillo Security

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Re: [PATCH v3 12/22] vfs: define kernel_read_file_from_path

[Luis R. Rodriguez]

On Wed, Feb 03, 2016 at 02:06:20PM -0500, Mimi Zohar wrote:
> This patch defines kernel_read_file_from_path(), a wrapper for the VFS
> common kernel_read_file().
> 
> Changelog:
> - Separated from the IMA patch
> 
> Signed-off-by: Mimi Zohar 

Acked-by: Luis R. Rodriguez 

  Luis

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[PATCH v3 12/22] vfs: define kernel_read_file_from_path

[Mimi Zohar]

This patch defines kernel_read_file_from_path(), a wrapper for the VFS
common kernel_read_file().

Changelog:
- Separated from the IMA patch

Signed-off-by: Mimi Zohar 
---
 fs/exec.c  | 22 ++
 include/linux/fs.h |  2 ++
 2 files changed, 24 insertions(+)

diff --git a/fs/exec.c b/fs/exec.c
index cd2b5b2..5629958 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -884,6 +884,28 @@ out:
 }
 EXPORT_SYMBOL_GPL(kernel_read_file);
 
+int kernel_read_file_from_path(char *path, void **buf, loff_t *size,
+  loff_t max_size, enum kernel_read_file_id id)
+{
+   struct file *file;
+   int ret;
+
+   if (!path || !*path)
+   return -EINVAL;
+
+   file = filp_open(path, O_RDONLY, 0);
+   if (IS_ERR(file)) {
+   ret = PTR_ERR(file);
+   pr_err("Unable to open file: %s (%d)", path, ret);
+   return ret;
+   }
+
+   ret = kernel_read_file(file, buf, size, max_size, id);
+   fput(file);
+   return ret;
+}
+EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
+
 ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t 
len)
 {
ssize_t res = vfs_read(file, (void __user *)addr, len, );
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1458ca5..962c491 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2533,6 +2533,8 @@ enum kernel_read_file_id {
 extern int kernel_read(struct file *, loff_t, char *, unsigned long);
 extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
enum kernel_read_file_id);
+extern int kernel_read_file_from_path(char *, void **, loff_t *, loff_t,
+ enum kernel_read_file_id);
 extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t);
 extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
 extern struct file * open_exec(const char *);
-- 
2.1.0


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