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sysctl: pass kernel pointers to ->proc_handler

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Instead of having all the sysctl handlers deal with user pointers, which
is rather hairy in terms of the BPF interaction, copy the input to and
from  userspace in common code.  This also means that the strings are
always NUL-terminated by the common code, making the API a little bit
safer.

As most handler just pass through the data to one of the common handlers
a lot of the changes are mechnical.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2020-04-24 08:43:38 +02:00
committed by Al Viro
parent f461d2dcd5
commit 32927393dc
88 changed files with 459 additions and 654 deletions
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16
mm/page-writeback.c
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@@ -512,8 +512,7 @@ bool node_dirty_ok(struct pglist_data *pgdat)
}
int dirty_background_ratio_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret;
@@ -524,8 +523,7 @@ int dirty_background_ratio_handler(struct ctl_table *table, int write,
}
int dirty_background_bytes_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret;
@@ -535,9 +533,8 @@ int dirty_background_bytes_handler(struct ctl_table *table, int write,
return ret;
}
int dirty_ratio_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
int dirty_ratio_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
int old_ratio = vm_dirty_ratio;
int ret;
@@ -551,8 +548,7 @@ int dirty_ratio_handler(struct ctl_table *table, int write,
}
int dirty_bytes_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
void *buffer, size_t *lenp, loff_t *ppos)
{
unsigned long old_bytes = vm_dirty_bytes;
int ret;
@@ -1972,7 +1968,7 @@ bool wb_over_bg_thresh(struct bdi_writeback *wb)
* sysctl handler for /proc/sys/vm/dirty_writeback_centisecs
*/
int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *length, loff_t *ppos)
void *buffer, size_t *length, loff_t *ppos)
{
unsigned int old_interval = dirty_writeback_interval;
int ret;