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fs/kernel_read_file: Switch buffer size arg to size_t

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In preparation for further refactoring of kernel_read_file*(), rename
the "max_size" argument to the more accurate "buf_size", and correct
its type to size_t. Add kerndoc to explain the specifics of how the
arguments will be used. Note that with buf_size now size_t, it can no
longer be negative (and was never called with a negative value). Adjust
callers to use it as a "maximum size" when *buf is NULL.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Link: https://lore.kernel.org/r/20201002173828.2099543-7-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2020-10-02 10:38:18 -07:00 • committed by Greg Kroah-Hartman
parent f7a4f689bc
commit 113eeb5177
4 changed files with 31 additions and 15 deletions
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8
include/linux/kernel_read_file.h
View file

@ -36,16 +36,16 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
}
int kernel_read_file(struct file *file,
void **buf, loff_t max_size,
void **buf, size_t buf_size,
enum kernel_read_file_id id);
int kernel_read_file_from_path(const char *path,
void **buf, loff_t max_size,
void **buf, size_t buf_size,
enum kernel_read_file_id id);
int kernel_read_file_from_path_initns(const char *path,
void **buf, loff_t max_size,
void **buf, size_t buf_size,
enum kernel_read_file_id id);
int kernel_read_file_from_fd(int fd,
void **buf, loff_t max_size,
void **buf, size_t buf_size,
enum kernel_read_file_id id);
#endif /* _LINUX_KERNEL_READ_FILE_H */