From e20e182ea0ab5c16557603f457fe0db445b63726 Mon Sep 17 00:00:00 2001 From: David Edmondson Date: Tue, 2 Mar 2021 09:03:15 +0000 Subject: [PATCH] x86/pvh: extract only 4 bytes of start address for 32 bit kernels When loading the PVH start address from a 32 bit ELF note, extract only the appropriate number of bytes. Fixes: ab969087da65 ("pvh: Boot uncompressed kernel using direct boot ABI") Signed-off-by: David Edmondson Reviewed-by: Stefano Garzarella Message-Id: <20210302090315.3031492-3-david.edmondson@oracle.com> Signed-off-by: Paolo Bonzini --- hw/i386/x86.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/hw/i386/x86.c b/hw/i386/x86.c index 6329f90ef9..7865660e2c 100644 --- a/hw/i386/x86.c +++ b/hw/i386/x86.c @@ -690,6 +690,8 @@ static uint64_t read_pvh_start_addr(void *arg1, void *arg2, bool is64) elf_note_data_addr = ((void *)nhdr64) + nhdr_size64 + QEMU_ALIGN_UP(nhdr_namesz, phdr_align); + + pvh_start_addr = *elf_note_data_addr; } else { struct elf32_note *nhdr32 = (struct elf32_note *)arg1; uint32_t nhdr_size32 = sizeof(struct elf32_note); @@ -699,9 +701,9 @@ static uint64_t read_pvh_start_addr(void *arg1, void *arg2, bool is64) elf_note_data_addr = ((void *)nhdr32) + nhdr_size32 + QEMU_ALIGN_UP(nhdr_namesz, phdr_align); - } - pvh_start_addr = *elf_note_data_addr; + pvh_start_addr = *(uint32_t *)elf_note_data_addr; + } return pvh_start_addr; }