[PATCH v3 12/22] vfs: define kernel_read_file_from_path
From: Mimi Zohar <hidden>
Date: 2016-02-03 19:08:50
Also in:
kexec
Subsystem:
exec & binfmt api, elf, filesystems (vfs and infrastructure), the rest · Maintainers:
Kees Cook, Alexander Viro, Christian Brauner, Linus Torvalds
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 <redacted> --- 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, &pos);
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 *);
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2.1.0