Provide a callback that will be called when writing to a ctl_table
entry after the user input has been validated.
This will simplify user input checks since now it will be possible to
remove them out of the proc_handler.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
fs/proc/proc_sysctl.c | 4 ++++
include/linux/sysctl.h | 1 +
2 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 21d836f..190db28 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -507,6 +507,10 @@ static ssize_t proc_sys_call_handler(struct file *filp, void __user *buf,
error = table->proc_handler(table, write, buf, &res, ppos);
if (!error)
error = res;
+
+ if (!error && write && table->callback)
+ error = table->callback();
+
out:
sysctl_head_finish(head);
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index c34b4c8..27c14cf 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -1022,6 +1022,7 @@ struct ctl_table
struct ctl_table_poll *poll;
void *extra1;
void *extra2;
+ int (*callback)(void); /* Called when entry is written to */
};
struct ctl_node {
--
1.7.8.5
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