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596b5a5dd1
Currently sysfs_strtoul_clamp() is defined as,
82 #define sysfs_strtoul_clamp(file, var, min, max) \
83 do { \
84 if (attr == &sysfs_ ## file) \
85 return strtoul_safe_clamp(buf, var, min, max) \
86 ?: (ssize_t) size; \
87 } while (0)
The problem is, if bit width of var is less then unsigned long, min and
max may not protect var from integer overflow, because overflow happens
in strtoul_safe_clamp() before checking min and max.
To fix such overflow in sysfs_strtoul_clamp(), to make min and max take
effect, this patch adds an unsigned long variable, and uses it to macro
strtoul_safe_clamp() to convert an unsigned long value in range defined
by [min, max]. Then assign this value to var. By this method, if bit
width of var is less than unsigned long, integer overflow won't happen
before min and max are checking.
Now sysfs_strtoul_clamp() can properly handle smaller data type like
unsigned int, of cause min and max should be defined in range of
unsigned int too.
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHE_SYSFS_H_
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#define _BCACHE_SYSFS_H_
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#define KTYPE(type) \
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struct kobj_type type ## _ktype = { \
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.release = type ## _release, \
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.sysfs_ops = &((const struct sysfs_ops) { \
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.show = type ## _show, \
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.store = type ## _store \
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}), \
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.default_attrs = type ## _files \
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}
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#define SHOW(fn) \
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static ssize_t fn ## _show(struct kobject *kobj, struct attribute *attr,\
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char *buf) \
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#define STORE(fn) \
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static ssize_t fn ## _store(struct kobject *kobj, struct attribute *attr,\
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const char *buf, size_t size) \
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#define SHOW_LOCKED(fn) \
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SHOW(fn) \
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{ \
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ssize_t ret; \
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mutex_lock(&bch_register_lock); \
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ret = __ ## fn ## _show(kobj, attr, buf); \
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mutex_unlock(&bch_register_lock); \
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return ret; \
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}
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#define STORE_LOCKED(fn) \
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STORE(fn) \
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{ \
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ssize_t ret; \
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mutex_lock(&bch_register_lock); \
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ret = __ ## fn ## _store(kobj, attr, buf, size); \
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mutex_unlock(&bch_register_lock); \
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return ret; \
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}
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#define __sysfs_attribute(_name, _mode) \
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static struct attribute sysfs_##_name = \
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{ .name = #_name, .mode = _mode }
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#define write_attribute(n) __sysfs_attribute(n, 0200)
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#define read_attribute(n) __sysfs_attribute(n, 0444)
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#define rw_attribute(n) __sysfs_attribute(n, 0644)
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#define sysfs_printf(file, fmt, ...) \
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do { \
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if (attr == &sysfs_ ## file) \
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return snprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__); \
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} while (0)
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#define sysfs_print(file, var) \
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do { \
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if (attr == &sysfs_ ## file) \
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return snprint(buf, PAGE_SIZE, var); \
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} while (0)
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#define sysfs_hprint(file, val) \
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do { \
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if (attr == &sysfs_ ## file) { \
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ssize_t ret = bch_hprint(buf, val); \
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strcat(buf, "\n"); \
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return ret + 1; \
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} \
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} while (0)
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#define var_printf(_var, fmt) sysfs_printf(_var, fmt, var(_var))
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#define var_print(_var) sysfs_print(_var, var(_var))
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#define var_hprint(_var) sysfs_hprint(_var, var(_var))
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#define sysfs_strtoul(file, var) \
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do { \
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if (attr == &sysfs_ ## file) \
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return strtoul_safe(buf, var) ?: (ssize_t) size; \
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} while (0)
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#define sysfs_strtoul_clamp(file, var, min, max) \
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do { \
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if (attr == &sysfs_ ## file) { \
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unsigned long v = 0; \
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ssize_t ret; \
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ret = strtoul_safe_clamp(buf, v, min, max); \
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if (!ret) { \
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var = v; \
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return size; \
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} \
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return ret; \
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} \
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} while (0)
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#define strtoul_or_return(cp) \
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({ \
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unsigned long _v; \
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int _r = kstrtoul(cp, 10, &_v); \
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if (_r) \
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return _r; \
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_v; \
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})
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#define strtoi_h_or_return(cp, v) \
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do { \
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int _r = strtoi_h(cp, &v); \
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if (_r) \
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return _r; \
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} while (0)
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#define sysfs_hatoi(file, var) \
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do { \
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if (attr == &sysfs_ ## file) \
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return strtoi_h(buf, &var) ?: (ssize_t) size; \
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} while (0)
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#endif /* _BCACHE_SYSFS_H_ */
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