From: Christoph Hellwig <hch@xxxxxx> Subject: exec: only build read_code when needed Only build read_code when binary formats that use it are built into the kernel. Link: http://lkml.kernel.org/r/20200515143646.3857579-26-hch@xxxxxx Signed-off-by: Christoph Hellwig <hch@xxxxxx> Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/exec.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/exec.c~exec-only-build-read_code-when-needed +++ a/fs/exec.c @@ -1053,6 +1053,8 @@ out: } EXPORT_SYMBOL_GPL(kernel_read_file_from_fd); +#if defined(CONFIG_HAVE_AOUT) || defined(CONFIG_BINFMT_FLAT) || \ + defined(CONFIG_BINFMT_ELF_FDPIC) 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); @@ -1061,6 +1063,7 @@ ssize_t read_code(struct file *file, uns return res; } EXPORT_SYMBOL(read_code); +#endif /* * Maps the mm_struct mm into the current task struct. _
