ipl_report.c
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// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <linux/ctype.h>
#include <asm/ebcdic.h>
#include <asm/sclp.h>
#include <asm/sections.h>
#include <asm/boot_data.h>
#include <uapi/asm/ipl.h>
#include "boot.h"
int __bootdata_preserved(ipl_secure_flag);
unsigned long __bootdata_preserved(ipl_cert_list_addr);
unsigned long __bootdata_preserved(ipl_cert_list_size);
unsigned long __bootdata(early_ipl_comp_list_addr);
unsigned long __bootdata(early_ipl_comp_list_size);
#define for_each_rb_entry(entry, rb) \
for (entry = rb->entries; \
(void *) entry + sizeof(*entry) <= (void *) rb + rb->len; \
entry++)
static inline bool intersects(unsigned long addr0, unsigned long size0,
unsigned long addr1, unsigned long size1)
{
return addr0 + size0 > addr1 && addr1 + size1 > addr0;
}
static unsigned long find_bootdata_space(struct ipl_rb_components *comps,
struct ipl_rb_certificates *certs,
unsigned long safe_addr)
{
struct ipl_rb_certificate_entry *cert;
struct ipl_rb_component_entry *comp;
size_t size;
/*
* Find the length for the IPL report boot data
*/
early_ipl_comp_list_size = 0;
for_each_rb_entry(comp, comps)
early_ipl_comp_list_size += sizeof(*comp);
ipl_cert_list_size = 0;
for_each_rb_entry(cert, certs)
ipl_cert_list_size += sizeof(unsigned int) + cert->len;
size = ipl_cert_list_size + early_ipl_comp_list_size;
/*
* Start from safe_addr to find a free memory area large
* enough for the IPL report boot data. This area is used
* for ipl_cert_list_addr/ipl_cert_list_size and
* early_ipl_comp_list_addr/early_ipl_comp_list_size. It must
* not overlap with any component or any certificate.
*/
repeat:
if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && INITRD_START && INITRD_SIZE &&
intersects(INITRD_START, INITRD_SIZE, safe_addr, size))
safe_addr = INITRD_START + INITRD_SIZE;
for_each_rb_entry(comp, comps)
if (intersects(safe_addr, size, comp->addr, comp->len)) {
safe_addr = comp->addr + comp->len;
goto repeat;
}
for_each_rb_entry(cert, certs)
if (intersects(safe_addr, size, cert->addr, cert->len)) {
safe_addr = cert->addr + cert->len;
goto repeat;
}
early_ipl_comp_list_addr = safe_addr;
ipl_cert_list_addr = safe_addr + early_ipl_comp_list_size;
return safe_addr + size;
}
static void copy_components_bootdata(struct ipl_rb_components *comps)
{
struct ipl_rb_component_entry *comp, *ptr;
ptr = (struct ipl_rb_component_entry *) early_ipl_comp_list_addr;
for_each_rb_entry(comp, comps)
memcpy(ptr++, comp, sizeof(*ptr));
}
static void copy_certificates_bootdata(struct ipl_rb_certificates *certs)
{
struct ipl_rb_certificate_entry *cert;
void *ptr;
ptr = (void *) ipl_cert_list_addr;
for_each_rb_entry(cert, certs) {
*(unsigned int *) ptr = cert->len;
ptr += sizeof(unsigned int);
memcpy(ptr, (void *) cert->addr, cert->len);
ptr += cert->len;
}
}
unsigned long read_ipl_report(unsigned long safe_addr)
{
struct ipl_rb_certificates *certs;
struct ipl_rb_components *comps;
struct ipl_pl_hdr *pl_hdr;
struct ipl_rl_hdr *rl_hdr;
struct ipl_rb_hdr *rb_hdr;
unsigned long tmp;
void *rl_end;
/*
* Check if there is a IPL report by looking at the copy
* of the IPL parameter information block.
*/
if (!ipl_block_valid ||
!(ipl_block.hdr.flags & IPL_PL_FLAG_IPLSR))
return safe_addr;
ipl_secure_flag = !!(ipl_block.hdr.flags & IPL_PL_FLAG_SIPL);
/*
* There is an IPL report, to find it load the pointer to the
* IPL parameter information block from lowcore and skip past
* the IPL parameter list, then align the address to a double
* word boundary.
*/
tmp = (unsigned long) S390_lowcore.ipl_parmblock_ptr;
pl_hdr = (struct ipl_pl_hdr *) tmp;
tmp = (tmp + pl_hdr->len + 7) & -8UL;
rl_hdr = (struct ipl_rl_hdr *) tmp;
/* Walk through the IPL report blocks in the IPL Report list */
certs = NULL;
comps = NULL;
rl_end = (void *) rl_hdr + rl_hdr->len;
rb_hdr = (void *) rl_hdr + sizeof(*rl_hdr);
while ((void *) rb_hdr + sizeof(*rb_hdr) < rl_end &&
(void *) rb_hdr + rb_hdr->len <= rl_end) {
switch (rb_hdr->rbt) {
case IPL_RBT_CERTIFICATES:
certs = (struct ipl_rb_certificates *) rb_hdr;
break;
case IPL_RBT_COMPONENTS:
comps = (struct ipl_rb_components *) rb_hdr;
break;
default:
break;
}
rb_hdr = (void *) rb_hdr + rb_hdr->len;
}
/*
* With either the component list or the certificate list
* missing the kernel will stay ignorant of secure IPL.
*/
if (!comps || !certs)
return safe_addr;
/*
* Copy component and certificate list to a safe area
* where the decompressed kernel can find them.
*/
safe_addr = find_bootdata_space(comps, certs, safe_addr);
copy_components_bootdata(comps);
copy_certificates_bootdata(certs);
return safe_addr;
}