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zipl: move secure boot verification into its own function

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Makes the code easier to read.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Sven Schnelle
2021-10-20 07:55:15 +02:00
committed by Jan Höppner
parent 724f800dc5
commit cff4b0384f
1 changed files with 18 additions and 12 deletions
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30
zipl/boot/stage3.c
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@@ -330,6 +330,21 @@ static void handle_environment(unsigned int len)
free_page((unsigned long)items);
}
static void verify_secure_boot(void)
{
/*
* IPL process is secure we have to use default IPL values and
* check if the psw jump address is within at the start of a
* verified component. If it is not IPL is aborted.
*/
if (_stage3_parms.image_addr != IMAGE_LOAD_ADDRESS ||
_stage3_parms.load_psw != DEFAULT_PSW_LOAD)
panic(ESECUREBOOT, "%s", msg_sipl_inval);
if (!is_verified_address(_stage3_parms.load_psw & PSW32_ADDR_MASK))
panic(ESECUREBOOT, "%s", msg_sipl_unverified);
}
void start(void)
{
unsigned int subchannel_id;
@@ -337,19 +352,10 @@ void start(void)
unsigned char *cmdline = (unsigned char *)COMMAND_LINE;
unsigned int cmdline_len = 0, cextra_len = 0;
/*
* IPL process is secure we have to use default IPL values and
* check if the psw jump address is within at the start of a
* verified component. If it is not IPL is aborted.
*/
if (secure_boot_enabled()) {
if (_stage3_parms.image_addr != IMAGE_LOAD_ADDRESS ||
_stage3_parms.load_psw != DEFAULT_PSW_LOAD)
panic(ESECUREBOOT, "%s", msg_sipl_inval);
if (!is_verified_address(_stage3_parms.load_psw & PSW32_ADDR_MASK))
panic(ESECUREBOOT, "%s", msg_sipl_unverified);
}
if (secure_boot_enabled())
verify_secure_boot();
/*
* cut the kernel header
*/