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s390: add system information as device randomness

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The virtual-machine cpu information data block and the cpu-id of
the boot cpu can be used as source of device randomness.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2014-08-11 12:20:58 +02:00
parent 852ffd0f4e
commit bcfcbb6bae
1 changed files with 19 additions and 0 deletions
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19
arch/s390/kernel/setup.c
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@ -24,6 +24,7 @@
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/random.h>
#include <linux/user.h>
#include <linux/tty.h>
#include <linux/ioport.h>
@ -61,6 +62,7 @@
#include <asm/diag.h>
#include <asm/os_info.h>
#include <asm/sclp.h>
#include <asm/sysinfo.h>
#include "entry.h"
/*
@ -766,6 +768,7 @@ static void __init setup_hwcaps(void)
#endif
get_cpu_id(&cpu_id);
add_device_randomness(&cpu_id, sizeof(cpu_id));
switch (cpu_id.machine) {
case 0x9672:
#if !defined(CONFIG_64BIT)
@ -803,6 +806,19 @@ static void __init setup_hwcaps(void)
}
}
/*
* Add system information as device randomness
*/
static void __init setup_randomness(void)
{
struct sysinfo_3_2_2 *vmms;
vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL);
if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count)
add_device_randomness(&vmms, vmms->count);
free_page((unsigned long) vmms);
}
/*
* Setup function called from init/main.c just after the banner
* was printed.
@ -901,6 +917,9 @@ void __init setup_arch(char **cmdline_p)
/* Setup zfcpdump support */
setup_zfcpdump();
/* Add system specific data to the random pool */
setup_randomness();
}
#ifdef CONFIG_32BIT