Implement ->proc_read_buf() so procfs copies what is read to userspace after it unpinned the entry. Unloading configs.ko then no longer waits for a reader that faults on its buffer. /proc/config.gz asks for PROC_ENTRY_FULL_READS so that reading all of it at once keeps working.
Signed-off-by: Christian Brauner (Amutable) <[email protected]> --- kernel/configs.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/configs.c b/kernel/configs.c index a28c79c5f713..05b12c440168 100644 --- a/kernel/configs.c +++ b/kernel/configs.c @@ -38,17 +38,18 @@ extern char kernel_config_data; extern char kernel_config_data_end; static ssize_t -ikconfig_read_current(struct file *file, char __user *buf, +ikconfig_read_current(struct file *file, char *buf, size_t len, loff_t * offset) { - return simple_read_from_buffer(buf, len, offset, + return memory_read_from_buffer(buf, len, offset, &kernel_config_data, &kernel_config_data_end - &kernel_config_data); } static const struct proc_ops config_gz_proc_ops = { - .proc_read = ikconfig_read_current, + .proc_flags = PROC_ENTRY_FULL_READS, + .proc_read_buf = ikconfig_read_current, .proc_lseek = default_llseek, }; -- 2.53.0
