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zipl: Do not strip kernel image IPL header

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The binary Linux kernel image is built to be loaded to memory address
0x0 but the first 64 kbyte contain an IPL header that is not used for
disk IPL. zIPL strips away this IPL header when writing IPL records to
disk, loads the remaining data to memory address 0x10000 and uses the
memory area below that for its own boot loader code.

The Secure Boot firmware feature checks the integrity of an installed
image during IPL using a checksum that was generated for the full image.
Since the checksum becomes invalid if the IPL header is removed, zIPL
must be changed to write the full image to disk.

This patch modifies the zIPL logic to no longer strip away the IPL
header. Instead the full image is loaded to a higher memory address and
relocated by the stage 3 boot loader code to its final location.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Stefan Haberland
2019-04-15 18:08:43 +02:00
committed by Jan Höppner
parent 63089835b0
commit e764f460c4
10 changed files with 70 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
zipl/include/boot.h
+5 -1
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@@ -248,6 +248,9 @@ struct boot_stage3_params {
uint64_t load_psw;
uint64_t extra_parm;
uint16_t flags;
uint16_t reserved[3];
uint64_t image_len;
uint64_t image_addr;
} __attribute__ ((packed));
#define STAGE3_FLAG_SCSI 0x0001
@@ -308,7 +311,8 @@ int boot_get_eckd_stage2(void** data, size_t* size, struct job_data* job);
size_t get_stage3_size();
int boot_get_stage3(void** buffer, size_t* bytecount, address_t parm_addr,
address_t initrd_addr, size_t initrd_len,
address_t image_addr, int extra_parm, uint16_t flags);
address_t image_addr, int extra_parm, uint16_t flags,
size_t image_len);
int boot_get_tape_ipl(void** data, size_t* size, address_t parm_addr,
address_t initrd_addr, address_t image_addr);
int boot_get_tape_dump(void** data, size_t* size, uint64_t mem);