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[efi] Create a copy of the system flattened device tree, if present

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EFI configuration tables may be freed at any time, and there is no way
to be notified when the table becomes invalidated.  Create a copy of
the system flattened device tree (if present), so that we do not risk
being left with an invalid pointer.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-03-28 14:10:55 +00:00
parent 3860313dd5
commit 666929e311
3 changed files with 15 additions and 5 deletions
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src/interface/efi/efi_fdt.c
+11
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@@ -44,6 +44,8 @@ EFI_USE_TABLE ( FDT_TABLE, &efi_fdt, 0 );
*
*/
static void efi_fdt_init ( void ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_STATUS efirc;
int rc;
/* Do nothing if no configuration table is present */
@@ -59,6 +61,15 @@ static void efi_fdt_init ( void ) {
strerror ( rc ) );
return;
}
/* Create copy, since table may be removed at any time */
if ( ( efirc = bs->AllocatePool ( EfiBootServicesData, sysfdt.len,
&sysfdt.raw ) ) != 0 ) {
DBGC ( &efi_fdt, "EFIFDT could not create copy\n" );
sysfdt.len = 0;
return;
}
memcpy ( sysfdt.raw, efi_fdt, sysfdt.len );
}
/** EFI Flattened Device Tree initialisation function */