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Input: add compat support for sysfs and /proc capabilities output

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Input core displays capabilities bitmasks in form of one or more longs printed
in hex form and separated by spaces. Unfortunately it does not work well
for 32-bit applications running on 64-bit kernels since applications expect
that number is "worth" only 32 bits when kernel advances by 64 bits.

Fix that by ensuring that output produced for compat tasks uses 32-bit units.

Reported-and-tested-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2010-01-11 00:05:43 -08:00
parent e6edbdc52b
commit 15e184afa8
1 changed files with 70 additions and 14 deletions
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84
drivers/input/input.c
View file

@ -24,6 +24,7 @@
#include <linux/mutex.h>
#include <linux/rcupdate.h>
#include <linux/smp_lock.h>
#include "input-compat.h"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("Input core");
@ -764,6 +765,40 @@ static int input_attach_handler(struct input_dev *dev, struct input_handler *han
return error;
}
#ifdef CONFIG_COMPAT
static int input_bits_to_string(char *buf, int buf_size,
unsigned long bits, bool skip_empty)
{
int len = 0;
if (INPUT_COMPAT_TEST) {
u32 dword = bits >> 32;
if (dword || !skip_empty)
len += snprintf(buf, buf_size, "%x ", dword);
dword = bits & 0xffffffffUL;
if (dword || !skip_empty || len)
len += snprintf(buf + len, max(buf_size - len, 0),
"%x", dword);
} else {
if (bits || !skip_empty)
len += snprintf(buf, buf_size, "%lx", bits);
}
return len;
}
#else /* !CONFIG_COMPAT */
static int input_bits_to_string(char *buf, int buf_size,
unsigned long bits, bool skip_empty)
{
return bits || !skip_empty ?
snprintf(buf, buf_size, "%lx", bits) : 0;
}
#endif
#ifdef CONFIG_PROC_FS
@ -832,14 +867,25 @@ static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
unsigned long *bitmap, int max)
{
int i;
for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
if (bitmap[i])
break;
bool skip_empty = true;
char buf[18];
seq_printf(seq, "B: %s=", name);
for (; i >= 0; i--)
seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
if (input_bits_to_string(buf, sizeof(buf),
bitmap[i], skip_empty)) {
skip_empty = false;
seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
}
}
/*
* If no output was produced print a single 0.
*/
if (skip_empty)
seq_puts(seq, "0");
seq_putc(seq, '\n');
}
@ -1128,14 +1174,23 @@ static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
{
int i;
int len = 0;
bool skip_empty = true;
for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
if (bitmap[i])
break;
for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
len += input_bits_to_string(buf + len, max(buf_size - len, 0),
bitmap[i], skip_empty);
if (len) {
skip_empty = false;
if (i > 0)
len += snprintf(buf + len, max(buf_size - len, 0), " ");
}
}
for (; i >= 0; i--)
len += snprintf(buf + len, max(buf_size - len, 0),
"%lx%s", bitmap[i], i > 0 ? " " : "");
/*
* If no output was produced print a single 0.
*/
if (len == 0)
len = snprintf(buf, buf_size, "%d", 0);
if (add_cr)
len += snprintf(buf + len, max(buf_size - len, 0), "\n");
@ -1150,7 +1205,8 @@ static ssize_t input_dev_show_cap_##bm(struct device *dev, \
{ \
struct input_dev *input_dev = to_input_dev(dev); \
int len = input_print_bitmap(buf, PAGE_SIZE, \
input_dev->bm##bit, ev##_MAX, 1); \
input_dev->bm##bit, ev##_MAX, \
true); \
return min_t(int, len, PAGE_SIZE); \
} \
static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
@ -1214,7 +1270,7 @@ static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
len = input_print_bitmap(&env->buf[env->buflen - 1],
sizeof(env->buf) - env->buflen,
bitmap, max, 0);
bitmap, max, false);
if (len >= (sizeof(env->buf) - env->buflen))
return -ENOMEM;