diff options
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 239 |
1 files changed, 91 insertions, 148 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 3fafca3ced98..e961286d0e14 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -208,12 +208,10 @@ static int max_extfrag_threshold = 1000; #ifdef CONFIG_PROC_SYSCTL static int _proc_do_string(char *data, int maxlen, int write, - char __user *buffer, - size_t *lenp, loff_t *ppos) + char *buffer, size_t *lenp, loff_t *ppos) { size_t len; - char __user *p; - char c; + char c, *p; if (!data || !maxlen || !*lenp) { *lenp = 0; @@ -238,8 +236,7 @@ static int _proc_do_string(char *data, int maxlen, int write, *ppos += *lenp; p = buffer; while ((p - buffer) < *lenp && len < maxlen - 1) { - if (get_user(c, p++)) - return -EFAULT; + c = *(p++); if (c == 0 || c == '\n') break; data[len++] = c; @@ -261,11 +258,9 @@ static int _proc_do_string(char *data, int maxlen, int write, if (len > *lenp) len = *lenp; if (len) - if (copy_to_user(buffer, data, len)) - return -EFAULT; + memcpy(buffer, data, len); if (len < *lenp) { - if (put_user('\n', buffer + len)) - return -EFAULT; + buffer[len] = '\n'; len++; } *lenp = len; @@ -326,13 +321,13 @@ static bool proc_first_pos_non_zero_ignore(loff_t *ppos, * Returns 0 on success. */ int proc_dostring(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { if (write) proc_first_pos_non_zero_ignore(ppos, table); - return _proc_do_string((char *)(table->data), table->maxlen, write, - (char __user *)buffer, lenp, ppos); + return _proc_do_string(table->data, table->maxlen, write, buffer, lenp, + ppos); } static size_t proc_skip_spaces(char **buf) @@ -463,11 +458,10 @@ static int proc_get_long(char **buf, size_t *size, * @val: the integer to be converted * @neg: sign of the number, %TRUE for negative * - * In case of success %0 is returned and @buf and @size are updated with - * the amount of bytes written. + * In case of success @buf and @size are updated with the amount of bytes + * written. */ -static int proc_put_long(void __user **buf, size_t *size, unsigned long val, - bool neg) +static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg) { int len; char tmp[TMPBUFLEN], *p = tmp; @@ -476,24 +470,22 @@ static int proc_put_long(void __user **buf, size_t *size, unsigned long val, len = strlen(tmp); if (len > *size) len = *size; - if (copy_to_user(*buf, tmp, len)) - return -EFAULT; + memcpy(*buf, tmp, len); *size -= len; *buf += len; - return 0; } #undef TMPBUFLEN -static int proc_put_char(void __user **buf, size_t *size, char c) +static void proc_put_char(void **buf, size_t *size, char c) { if (*size) { - char __user **buffer = (char __user **)buf; - if (put_user(c, *buffer)) - return -EFAULT; - (*size)--, (*buffer)++; + char **buffer = (char **)buf; + **buffer = c; + + (*size)--; + (*buffer)++; *buf = *buffer; } - return 0; } static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, @@ -541,7 +533,7 @@ static int do_proc_douintvec_conv(unsigned long *lvalp, static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, - int write, void __user *buffer, + int write, void *buffer, size_t *lenp, loff_t *ppos, int (*conv)(bool *negp, unsigned long *lvalp, int *valp, int write, void *data), @@ -549,7 +541,7 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, { int *i, vleft, first = 1, err = 0; size_t left; - char *kbuf = NULL, *p; + char *p; if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { *lenp = 0; @@ -569,9 +561,7 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, if (left > PAGE_SIZE - 1) left = PAGE_SIZE - 1; - p = kbuf = memdup_user_nul(buffer, left); - if (IS_ERR(kbuf)) - return PTR_ERR(kbuf); + p = buffer; } for (; left && vleft--; i++, first=0) { @@ -598,24 +588,17 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, break; } if (!first) - err = proc_put_char(&buffer, &left, '\t'); - if (err) - break; - err = proc_put_long(&buffer, &left, lval, neg); - if (err) - break; + proc_put_char(&buffer, &left, '\t'); + proc_put_long(&buffer, &left, lval, neg); } } if (!write && !first && left && !err) - err = proc_put_char(&buffer, &left, '\n'); + proc_put_char(&buffer, &left, '\n'); if (write && !err && left) left -= proc_skip_spaces(&p); - if (write) { - kfree(kbuf); - if (first) - return err ? : -EINVAL; - } + if (write && first) + return err ? : -EINVAL; *lenp -= left; out: *ppos += *lenp; @@ -623,7 +606,7 @@ out: } static int do_proc_dointvec(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos, + void *buffer, size_t *lenp, loff_t *ppos, int (*conv)(bool *negp, unsigned long *lvalp, int *valp, int write, void *data), void *data) @@ -634,7 +617,7 @@ static int do_proc_dointvec(struct ctl_table *table, int write, static int do_proc_douintvec_w(unsigned int *tbl_data, struct ctl_table *table, - void __user *buffer, + void *buffer, size_t *lenp, loff_t *ppos, int (*conv)(unsigned long *lvalp, unsigned int *valp, @@ -645,7 +628,7 @@ static int do_proc_douintvec_w(unsigned int *tbl_data, int err = 0; size_t left; bool neg; - char *kbuf = NULL, *p; + char *p = buffer; left = *lenp; @@ -655,10 +638,6 @@ static int do_proc_douintvec_w(unsigned int *tbl_data, if (left > PAGE_SIZE - 1) left = PAGE_SIZE - 1; - p = kbuf = memdup_user_nul(buffer, left); - if (IS_ERR(kbuf)) - return -EINVAL; - left -= proc_skip_spaces(&p); if (!left) { err = -EINVAL; @@ -682,7 +661,6 @@ static int do_proc_douintvec_w(unsigned int *tbl_data, left -= proc_skip_spaces(&p); out_free: - kfree(kbuf); if (err) return -EINVAL; @@ -694,7 +672,7 @@ bail_early: return err; } -static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, +static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer, size_t *lenp, loff_t *ppos, int (*conv)(unsigned long *lvalp, unsigned int *valp, @@ -712,11 +690,11 @@ static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, goto out; } - err = proc_put_long(&buffer, &left, lval, false); - if (err || !left) + proc_put_long(&buffer, &left, lval, false); + if (!left) goto out; - err = proc_put_char(&buffer, &left, '\n'); + proc_put_char(&buffer, &left, '\n'); out: *lenp -= left; @@ -726,7 +704,7 @@ out: } static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, - int write, void __user *buffer, + int write, void *buffer, size_t *lenp, loff_t *ppos, int (*conv)(unsigned long *lvalp, unsigned int *valp, @@ -762,7 +740,7 @@ static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, } static int do_proc_douintvec(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos, + void *buffer, size_t *lenp, loff_t *ppos, int (*conv)(unsigned long *lvalp, unsigned int *valp, int write, void *data), @@ -785,16 +763,15 @@ static int do_proc_douintvec(struct ctl_table *table, int write, * * Returns 0 on success. */ -int proc_dointvec(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) +int proc_dointvec(struct ctl_table *table, int write, void *buffer, + size_t *lenp, loff_t *ppos) { return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); } #ifdef CONFIG_COMPACTION static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table, - int write, void __user *buffer, - size_t *lenp, loff_t *ppos) + int write, void *buffer, size_t *lenp, loff_t *ppos) { int ret, old; @@ -826,8 +803,8 @@ static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table, * * Returns 0 on success. */ -int proc_douintvec(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) +int proc_douintvec(struct ctl_table *table, int write, void *buffer, + size_t *lenp, loff_t *ppos) { return do_proc_douintvec(table, write, buffer, lenp, ppos, do_proc_douintvec_conv, NULL); @@ -838,7 +815,7 @@ int proc_douintvec(struct ctl_table *table, int write, * This means we can safely use a temporary. */ static int proc_taint(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 t; unsigned long tmptaint = get_taint(); @@ -870,7 +847,7 @@ static int proc_taint(struct ctl_table *table, int write, #ifdef CONFIG_PRINTK static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { if (write && !capable(CAP_SYS_ADMIN)) return -EPERM; @@ -936,7 +913,7 @@ static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, * Returns 0 on success or -EINVAL on write when the range check fails. */ int proc_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 do_proc_dointvec_minmax_conv_param param = { .min = (int *) table->extra1, @@ -1005,7 +982,7 @@ static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, * Returns 0 on success or -ERANGE on write when the range check fails. */ int proc_douintvec_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 do_proc_douintvec_minmax_conv_param param = { .min = (unsigned int *) table->extra1, @@ -1036,7 +1013,7 @@ static int do_proc_dopipe_max_size_conv(unsigned long *lvalp, } static int proc_dopipe_max_size(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return do_proc_douintvec(table, write, buffer, lenp, ppos, do_proc_dopipe_max_size_conv, NULL); @@ -1057,7 +1034,7 @@ static void validate_coredump_safety(void) } static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); if (!error) @@ -1067,7 +1044,7 @@ static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, #ifdef CONFIG_COREDUMP static int proc_dostring_coredump(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { int error = proc_dostring(table, write, buffer, lenp, ppos); if (!error) @@ -1078,7 +1055,7 @@ static int proc_dostring_coredump(struct ctl_table *table, int write, #ifdef CONFIG_MAGIC_SYSRQ static int sysrq_sysctl_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 tmp, ret; @@ -1096,16 +1073,14 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, } #endif -static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, - void __user *buffer, - size_t *lenp, loff_t *ppos, - unsigned long convmul, - unsigned long convdiv) +static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, + int write, void *buffer, size_t *lenp, loff_t *ppos, + unsigned long convmul, unsigned long convdiv) { unsigned long *i, *min, *max; int vleft, first = 1, err = 0; size_t left; - char *kbuf = NULL, *p; + char *p; if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { *lenp = 0; @@ -1124,9 +1099,7 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int if (left > PAGE_SIZE - 1) left = PAGE_SIZE - 1; - p = kbuf = memdup_user_nul(buffer, left); - if (IS_ERR(kbuf)) - return PTR_ERR(kbuf); + p = buffer; } for (; left && vleft--; i++, first = 0) { @@ -1154,26 +1127,18 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int *i = val; } else { val = convdiv * (*i) / convmul; - if (!first) { - err = proc_put_char(&buffer, &left, '\t'); - if (err) - break; - } - err = proc_put_long(&buffer, &left, val, false); - if (err) - break; + if (!first) + proc_put_char(&buffer, &left, '\t'); + proc_put_long(&buffer, &left, val, false); } } if (!write && !first && left && !err) - err = proc_put_char(&buffer, &left, '\n'); + proc_put_char(&buffer, &left, '\n'); if (write && !err) left -= proc_skip_spaces(&p); - if (write) { - kfree(kbuf); - if (first) - return err ? : -EINVAL; - } + if (write && first) + return err ? : -EINVAL; *lenp -= left; out: *ppos += *lenp; @@ -1181,10 +1146,8 @@ out: } static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, - void __user *buffer, - size_t *lenp, loff_t *ppos, - unsigned long convmul, - unsigned long convdiv) + void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul, + unsigned long convdiv) { return __do_proc_doulongvec_minmax(table->data, table, write, buffer, lenp, ppos, convmul, convdiv); @@ -1207,7 +1170,7 @@ static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, * Returns 0 on success. */ int proc_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) { return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); } @@ -1230,8 +1193,7 @@ int proc_doulongvec_minmax(struct ctl_table *table, int write, * Returns 0 on success. */ int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, - void __user *buffer, - size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, HZ, 1000l); @@ -1325,7 +1287,7 @@ static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, * Returns 0 on success. */ int proc_dointvec_jiffies(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return do_proc_dointvec(table,write,buffer,lenp,ppos, do_proc_dointvec_jiffies_conv,NULL); @@ -1347,7 +1309,7 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write, * Returns 0 on success. */ int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return do_proc_dointvec(table,write,buffer,lenp,ppos, do_proc_dointvec_userhz_jiffies_conv,NULL); @@ -1369,15 +1331,15 @@ int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, * * Returns 0 on success. */ -int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) +int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer, + size_t *lenp, loff_t *ppos) { return do_proc_dointvec(table, write, buffer, lenp, ppos, do_proc_dointvec_ms_jiffies_conv, NULL); } -static int proc_do_cad_pid(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) +static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer, + size_t *lenp, loff_t *ppos) { struct pid *new_pid; pid_t tmp; @@ -1416,7 +1378,7 @@ static int proc_do_cad_pid(struct ctl_table *table, int write, * Returns 0 on success. */ int proc_do_large_bitmap(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { int err = 0; bool first = 1; @@ -1432,7 +1394,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, } if (write) { - char *kbuf, *p; + char *p = buffer; size_t skipped = 0; if (left > PAGE_SIZE - 1) { @@ -1441,15 +1403,9 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, skipped = *lenp - left; } - p = kbuf = memdup_user_nul(buffer, left); - if (IS_ERR(kbuf)) - return PTR_ERR(kbuf); - tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL); - if (!tmp_bitmap) { - kfree(kbuf); + if (!tmp_bitmap) return -ENOMEM; - } proc_skip_char(&p, &left, '\n'); while (!err && left) { unsigned long val_a, val_b; @@ -1513,7 +1469,6 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, first = 0; proc_skip_char(&p, &left, '\n'); } - kfree(kbuf); left += skipped; } else { unsigned long bit_a, bit_b = 0; @@ -1525,27 +1480,17 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, bit_b = find_next_zero_bit(bitmap, bitmap_len, bit_a + 1) - 1; - if (!first) { - err = proc_put_char(&buffer, &left, ','); - if (err) - break; - } - err = proc_put_long(&buffer, &left, bit_a, false); - if (err) - break; + if (!first) + proc_put_char(&buffer, &left, ','); + proc_put_long(&buffer, &left, bit_a, false); if (bit_a != bit_b) { - err = proc_put_char(&buffer, &left, '-'); - if (err) - break; - err = proc_put_long(&buffer, &left, bit_b, false); - if (err) - break; + proc_put_char(&buffer, &left, '-'); + proc_put_long(&buffer, &left, bit_b, false); } first = 0; bit_b++; } - if (!err) - err = proc_put_char(&buffer, &left, '\n'); + proc_put_char(&buffer, &left, '\n'); } if (!err) { @@ -1566,68 +1511,67 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, #else /* CONFIG_PROC_SYSCTL */ int proc_dostring(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } int proc_dointvec(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } int proc_douintvec(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } int proc_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) { return -ENOSYS; } int proc_douintvec_minmax(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } int proc_dointvec_jiffies(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } int proc_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) { return -ENOSYS; } int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, - void __user *buffer, - size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { - return -ENOSYS; + return -ENOSYS; } int proc_do_large_bitmap(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } @@ -1636,8 +1580,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, #if defined(CONFIG_SYSCTL) int proc_do_static_key(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, - loff_t *ppos) + void *buffer, size_t *lenp, loff_t *ppos) { struct static_key *key = (struct static_key *)table->data; static DEFINE_MUTEX(static_key_mutex); |