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authorChristoph Hellwig <hch@lst.de>2020-04-24 09:43:38 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-04-27 09:07:40 +0300
commit32927393dc1ccd60fb2bdc05b9e8e88753761469 (patch)
treec488a5564cdde7594c953219a98e22fb4865c812 /ipc/ipc_sysctl.c
parentf461d2dcd511c020a26d4d791fae595c65ed09b6 (diff)
downloadlinux-32927393dc1ccd60fb2bdc05b9e8e88753761469.tar.xz
sysctl: pass kernel pointers to ->proc_handler
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>
Diffstat (limited to 'ipc/ipc_sysctl.c')
-rw-r--r--ipc/ipc_sysctl.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
index affd66537e87..d1b8644bfb88 100644
--- a/ipc/ipc_sysctl.c
+++ b/ipc/ipc_sysctl.c
@@ -24,7 +24,7 @@ static void *get_ipc(struct ctl_table *table)
#ifdef CONFIG_PROC_SYSCTL
static int proc_ipc_dointvec(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
struct ctl_table ipc_table;
@@ -35,7 +35,7 @@ static int proc_ipc_dointvec(struct ctl_table *table, int write,
}
static int proc_ipc_dointvec_minmax(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
struct ctl_table ipc_table;
@@ -46,7 +46,7 @@ static int proc_ipc_dointvec_minmax(struct ctl_table *table, int write,
}
static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
struct ipc_namespace *ns = current->nsproxy->ipc_ns;
int err = proc_ipc_dointvec_minmax(table, write, buffer, lenp, ppos);
@@ -59,7 +59,7 @@ static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
}
static int proc_ipc_doulongvec_minmax(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
struct ctl_table ipc_table;
memcpy(&ipc_table, table, sizeof(ipc_table));
@@ -70,7 +70,7 @@ static int proc_ipc_doulongvec_minmax(struct ctl_table *table, int write,
}
static int proc_ipc_auto_msgmni(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
struct ctl_table ipc_table;
int dummy = 0;