diff options
Diffstat (limited to 'include/linux/sysctl.h')
| -rw-r--r-- | include/linux/sysctl.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h index a0ca9496119a..fa78136617ad 100644 --- a/include/linux/sysctl.h +++ b/include/linux/sysctl.h @@ -134,6 +134,45 @@ int do_proc_int_conv##name(bool *negp, unsigned long *u_ptr, int *k_ptr,\ return 0; \ } +#define SYSCTL_USER_TO_KERN_UINT_CONV(name, u_ptr_op) \ +int sysctl_user_to_kern_uint_conv##name(const unsigned long *u_ptr,\ + unsigned int *k_ptr) \ +{ \ + unsigned long u = u_ptr_op(*u_ptr); \ + if (u > UINT_MAX) \ + return -EINVAL; \ + WRITE_ONCE(*k_ptr, u); \ + return 0; \ +} + +#define SYSCTL_UINT_CONV_CUSTOM(name, user_to_kern, kern_to_user, \ + k_ptr_range_check) \ +int do_proc_uint_conv##name(unsigned long *u_ptr, unsigned int *k_ptr, \ + int dir, const struct ctl_table *tbl) \ +{ \ + if (SYSCTL_KERN_TO_USER(dir)) \ + return kern_to_user(u_ptr, k_ptr); \ + \ + if (k_ptr_range_check) { \ + unsigned int tmp_k; \ + int ret; \ + if (!tbl) \ + return -EINVAL; \ + ret = user_to_kern(u_ptr, &tmp_k); \ + if (ret) \ + return ret; \ + if ((tbl->extra1 && \ + *(unsigned int *)tbl->extra1 > tmp_k) || \ + (tbl->extra2 && \ + *(unsigned int *)tbl->extra2 < tmp_k)) \ + return -ERANGE; \ + WRITE_ONCE(*k_ptr, tmp_k); \ + } else \ + return user_to_kern(u_ptr, k_ptr); \ + return 0; \ +} + + extern const unsigned long sysctl_long_vals[]; typedef int proc_handler(const struct ctl_table *ctl, int write, void *buffer, @@ -166,6 +205,7 @@ int proc_doulongvec_ms_jiffies_minmax(const struct ctl_table *table, int, void * int proc_do_large_bitmap(const struct ctl_table *, int, void *, size_t *, loff_t *); int proc_do_static_key(const struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos); +int sysctl_kern_to_user_uint_conv(unsigned long *u_ptr, const unsigned int *k_ptr); /* * Register a set of sysctl names by calling register_sysctl |