From 729829d775c9a5217abc784b2f16087d79c4eec8 Mon Sep 17 00:00:00 2001 From: Philipp Rudo Date: Mon, 1 Apr 2019 12:48:43 +0200 Subject: s390/kexec_file: Fix detection of text segment in ELF loader To register data for the next kernel (command line, oldmem_base, etc.) the current kernel needs to find the ELF segment that contains head.S. This is currently done by checking ifor 'phdr->p_paddr == 0'. This works fine for the current kernel build but in theory the first few pages could be skipped. Make the detection more robust by checking if the entry point lies within the segment. Signed-off-by: Philipp Rudo Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/kexec_elf.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'arch/s390/kernel/kexec_elf.c') diff --git a/arch/s390/kernel/kexec_elf.c b/arch/s390/kernel/kexec_elf.c index 1d1c77c647d2..5cf340b778f1 100644 --- a/arch/s390/kernel/kexec_elf.c +++ b/arch/s390/kernel/kexec_elf.c @@ -19,10 +19,15 @@ static int kexec_file_add_elf_kernel(struct kimage *image, struct kexec_buf buf; const Elf_Ehdr *ehdr; const Elf_Phdr *phdr; + Elf_Addr entry; int i, ret; ehdr = (Elf_Ehdr *)kernel; buf.image = image; + if (image->type == KEXEC_TYPE_CRASH) + entry = STARTUP_KDUMP_OFFSET; + else + entry = ehdr->e_entry; phdr = (void *)ehdr + ehdr->e_phoff; for (i = 0; i < ehdr->e_phnum; i++, phdr++) { @@ -35,7 +40,7 @@ static int kexec_file_add_elf_kernel(struct kimage *image, buf.mem = ALIGN(phdr->p_paddr, phdr->p_align); buf.memsz = phdr->p_memsz; - if (phdr->p_paddr == 0) { + if (entry - phdr->p_paddr < phdr->p_memsz) { data->kernel_buf = buf.buffer; data->memsz += STARTUP_NORMAL_OFFSET; -- cgit v1.2.3-59-g8ed1b