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zipl/boot: Introduce os_info validation API

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- Add os_info_check() function to verify os_info address, magic and
  checksum.
- Add os_info_entry_is_valid() function to check whether requested entry
  is present and valid.

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Acked-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Mikhail Zaslonko
2023-04-21 16:41:04 +02:00
committed by Jan Höppner
parent eb06ebe245
commit 87136bb0d0
1 changed files with 33 additions and 0 deletions
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33
include/boot/os_info.h
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@@ -13,6 +13,8 @@
#define OS_INFO_H
#include "lib/zt_common.h"
#include "boot/error.h"
#include "boot/s390.h"
#include <stdint.h>
#define OS_INFO_MAGIC 0x4f53494e464f535aULL /* OSINFOSZ */
@@ -38,4 +40,35 @@ struct os_info {
uint8_t reserved[4024];
} __packed;
/*
* Return 0 in case of valid os_info
* Return -EOS_INFO_MISSING if os_info address is not page aligned or page is
* not accessible or os_info magic value is missing.
* Return -EOS_INFO_CSUM_FAILED if os_info checksum is invalid.
*/
static inline int os_info_check(const struct os_info *os_info)
{
if (!os_info ||
(unsigned long)os_info % PAGE_SIZE ||
!page_is_valid((unsigned long)os_info) ||
os_info->magic != OS_INFO_MAGIC)
return -EOS_INFO_MISSING;
if (os_info->csum != csum_partial(&os_info->version_major, OS_INFO_CSUM_SIZE, 0))
return -EOS_INFO_CSUM_FAILED;
return 0;
}
/*
* Return 1 in case of valid os_info_entry, otherwise 0
* Make sure that the entire os_info structure is checked first with os_info_check().
*/
static inline int os_info_entry_is_valid(const struct os_info_entry *entry)
{
return (entry &&
entry->addr &&
entry->size &&
page_is_valid(entry->addr) &&
entry->csum == csum_partial((void *)entry->addr, entry->size, 0));
}
#endif /* OS_INFO_H */