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/*
* Copyright (c) 2018-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include <linux/types.h>
#include <linux/random.h>
#define XLAT_MACROS_ONLY
#include "xlat/random_ioctl_cmds.h"
#undef XLAT_MACROS_ONLY
/*
* RNDGETPOOL was removed in 2.6.9, so non-ancient kernels always
* return -EINVAL for that.
*/
int
random_ioctl(struct tcb *const tcp, const unsigned int code,
const kernel_ulong_t arg)
{
struct rand_pool_info info;
kernel_ulong_t buf;
switch (code) {
case RNDGETENTCNT:
if (entering(tcp))
return 0;
ATTRIBUTE_FALLTHROUGH;
case RNDADDTOENTCNT:
tprint_arg_next();
printnum_int(tcp, arg, "%d");
break;
case RNDADDENTROPY:
tprint_arg_next();
if (!umove_or_printaddr(tcp, arg, &info)) {
tprint_struct_begin();
PRINT_FIELD_D(info, entropy_count);
tprint_struct_next();
PRINT_FIELD_D(info, buf_size);
tprint_struct_next();
tprints_field_name("buf");
buf = arg + offsetof(struct rand_pool_info, buf);
printstrn(tcp, buf, info.buf_size);
tprint_struct_end();
}
break;
/* ioctls with no parameters */
case RNDZAPENTCNT:
case RNDCLEARPOOL:
case RNDRESEEDCRNG:
break;
default:
return RVAL_DECODED;
}
return RVAL_IOCTL_DECODED;
}
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