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vfs: define kernel_read_file_from_path

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

Changelog:
- revert error msg regression - reported by Sergey Senozhatsky
- Separated from the IMA patch

Signed-off-by: Mimi Zohar <[email protected]>
Acked-by: Kees Cook <[email protected]>
Acked-by: Luis R. Rodriguez <[email protected]>
Cc: Al Viro <[email protected]>
This commit is contained in:
Mimi Zohar 2015-11-19 12:39:22 -05:00
commit 09596b94f7
2 changed files with 21 additions and 0 deletions
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19
fs/exec.c
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@ -884,6 +884,25 @@ 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))
return PTR_ERR(file);
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, &pos);