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-rw-r--r--arch/s390/boot/.gitignore1
-rw-r--r--arch/s390/boot/Makefile25
-rw-r--r--arch/s390/boot/boot.h6
-rw-r--r--arch/s390/boot/startup.c75
-rw-r--r--arch/s390/boot/vmem.c2
-rw-r--r--arch/s390/boot/vmlinux.lds.S48
6 files changed, 141 insertions, 16 deletions
diff --git a/arch/s390/boot/.gitignore b/arch/s390/boot/.gitignore
index f56591bc08..f5ef099e2f 100644
--- a/arch/s390/boot/.gitignore
+++ b/arch/s390/boot/.gitignore
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
image
bzImage
+relocs.S
section_cmp.*
vmlinux
vmlinux.lds
diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index c7c81e5f92..294f08a881 100644
--- a/arch/s390/boot/Makefile
+++ b/arch/s390/boot/Makefile
@@ -37,7 +37,8 @@ CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char
obj-y := head.o als.o startup.o physmem_info.o ipl_parm.o ipl_report.o vmem.o
obj-y += string.o ebcdic.o sclp_early_core.o mem.o ipl_vmparm.o cmdline.o
-obj-y += version.o pgm_check_info.o ctype.o ipl_data.o machine_kexec_reloc.o
+obj-y += version.o pgm_check_info.o ctype.o ipl_data.o
+obj-y += $(if $(CONFIG_PIE_BUILD),machine_kexec_reloc.o,relocs.o)
obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE)) += uv.o
obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o
obj-y += $(if $(CONFIG_KERNEL_UNCOMPRESSED),,decompressor.o) info.o
@@ -48,6 +49,9 @@ targets := bzImage section_cmp.boot.data section_cmp.boot.preserved.data $(obj-y
targets += vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2
targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4
targets += vmlinux.bin.zst info.bin syms.bin vmlinux.syms $(obj-all)
+ifndef CONFIG_PIE_BUILD
+targets += relocs.S
+endif
OBJECTS := $(addprefix $(obj)/,$(obj-y))
OBJECTS_ALL := $(addprefix $(obj)/,$(obj-all))
@@ -56,9 +60,9 @@ clean-files += vmlinux.map
quiet_cmd_section_cmp = SECTCMP $*
define cmd_section_cmp
- s1=`$(OBJDUMP) -t -j "$*" "$<" | sort | \
+ s1=`$(OBJDUMP) -t "$<" | grep "\s$*\s\+" | sort | \
sed -n "/0000000000000000/! s/.*\s$*\s\+//p" | sha256sum`; \
- s2=`$(OBJDUMP) -t -j "$*" "$(word 2,$^)" | sort | \
+ s2=`$(OBJDUMP) -t "$(word 2,$^)" | grep "\s$*\s\+" | sort | \
sed -n "/0000000000000000/! s/.*\s$*\s\+//p" | sha256sum`; \
if [ "$$s1" != "$$s2" ]; then \
echo "error: section $* differs between $< and $(word 2,$^)" >&2; \
@@ -73,11 +77,12 @@ $(obj)/bzImage: $(obj)/vmlinux $(obj)/section_cmp.boot.data $(obj)/section_cmp.b
$(obj)/section_cmp%: vmlinux $(obj)/vmlinux FORCE
$(call if_changed,section_cmp)
-LDFLAGS_vmlinux := --oformat $(LD_BFD) -e startup $(if $(CONFIG_VMLINUX_MAP),-Map=$(obj)/vmlinux.map) --build-id=sha1 -T
+LDFLAGS_vmlinux-$(CONFIG_LD_ORPHAN_WARN) := --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
+LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y) --oformat $(LD_BFD) -e startup $(if $(CONFIG_VMLINUX_MAP),-Map=$(obj)/vmlinux.map) --build-id=sha1 -T
$(obj)/vmlinux: $(obj)/vmlinux.lds $(OBJECTS_ALL) FORCE
$(call if_changed,ld)
-LDFLAGS_vmlinux.syms := --oformat $(LD_BFD) -e startup -T
+LDFLAGS_vmlinux.syms := $(LDFLAGS_vmlinux-y) --oformat $(LD_BFD) -e startup -T
$(obj)/vmlinux.syms: $(obj)/vmlinux.lds $(OBJECTS) FORCE
$(call if_changed,ld)
@@ -93,7 +98,7 @@ OBJCOPYFLAGS_syms.o := -I binary -O elf64-s390 -B s390:64-bit --rename-section .
$(obj)/syms.o: $(obj)/syms.bin FORCE
$(call if_changed,objcopy)
-OBJCOPYFLAGS_info.bin := -O binary --only-section=.vmlinux.info --set-section-flags .vmlinux.info=load
+OBJCOPYFLAGS_info.bin := -O binary --only-section=.vmlinux.info --set-section-flags .vmlinux.info=alloc,load
$(obj)/info.bin: vmlinux FORCE
$(call if_changed,objcopy)
@@ -105,6 +110,14 @@ OBJCOPYFLAGS_vmlinux.bin := -O binary --remove-section=.comment --remove-section
$(obj)/vmlinux.bin: vmlinux FORCE
$(call if_changed,objcopy)
+ifndef CONFIG_PIE_BUILD
+CMD_RELOCS=arch/s390/tools/relocs
+quiet_cmd_relocs = RELOCS $@
+ cmd_relocs = $(CMD_RELOCS) $< > $@
+$(obj)/relocs.S: vmlinux FORCE
+ $(call if_changed,relocs)
+endif
+
suffix-$(CONFIG_KERNEL_GZIP) := .gz
suffix-$(CONFIG_KERNEL_BZIP2) := .bz2
suffix-$(CONFIG_KERNEL_LZ4) := .lz4
diff --git a/arch/s390/boot/boot.h b/arch/s390/boot/boot.h
index 222c6886ac..567d60f78b 100644
--- a/arch/s390/boot/boot.h
+++ b/arch/s390/boot/boot.h
@@ -25,9 +25,14 @@ struct vmlinux_info {
unsigned long bootdata_size;
unsigned long bootdata_preserved_off;
unsigned long bootdata_preserved_size;
+#ifdef CONFIG_PIE_BUILD
unsigned long dynsym_start;
unsigned long rela_dyn_start;
unsigned long rela_dyn_end;
+#else
+ unsigned long got_start;
+ unsigned long got_end;
+#endif
unsigned long amode31_size;
unsigned long init_mm_off;
unsigned long swapper_pg_dir_off;
@@ -83,6 +88,7 @@ extern unsigned long vmalloc_size;
extern int vmalloc_size_set;
extern char __boot_data_start[], __boot_data_end[];
extern char __boot_data_preserved_start[], __boot_data_preserved_end[];
+extern char __vmlinux_relocs_64_start[], __vmlinux_relocs_64_end[];
extern char _decompressor_syms_start[], _decompressor_syms_end[];
extern char _stack_start[], _stack_end[];
extern char _end[], _decompressor_end[];
diff --git a/arch/s390/boot/startup.c b/arch/s390/boot/startup.c
index 9cc76e6317..6cf8931420 100644
--- a/arch/s390/boot/startup.c
+++ b/arch/s390/boot/startup.c
@@ -141,7 +141,8 @@ static void copy_bootdata(void)
memcpy((void *)vmlinux.bootdata_preserved_off, __boot_data_preserved_start, vmlinux.bootdata_preserved_size);
}
-static void handle_relocs(unsigned long offset)
+#ifdef CONFIG_PIE_BUILD
+static void kaslr_adjust_relocs(unsigned long min_addr, unsigned long max_addr, unsigned long offset)
{
Elf64_Rela *rela_start, *rela_end, *rela;
int r_type, r_sym, rc;
@@ -172,6 +173,54 @@ static void handle_relocs(unsigned long offset)
}
}
+static void kaslr_adjust_got(unsigned long offset) {}
+static void rescue_relocs(void) {}
+static void free_relocs(void) {}
+#else
+static int *vmlinux_relocs_64_start;
+static int *vmlinux_relocs_64_end;
+
+static void rescue_relocs(void)
+{
+ unsigned long size = __vmlinux_relocs_64_end - __vmlinux_relocs_64_start;
+
+ vmlinux_relocs_64_start = (void *)physmem_alloc_top_down(RR_RELOC, size, 0);
+ vmlinux_relocs_64_end = (void *)vmlinux_relocs_64_start + size;
+ memmove(vmlinux_relocs_64_start, __vmlinux_relocs_64_start, size);
+}
+
+static void free_relocs(void)
+{
+ physmem_free(RR_RELOC);
+}
+
+static void kaslr_adjust_relocs(unsigned long min_addr, unsigned long max_addr, unsigned long offset)
+{
+ int *reloc;
+ long loc;
+
+ /* Adjust R_390_64 relocations */
+ for (reloc = vmlinux_relocs_64_start; reloc < vmlinux_relocs_64_end; reloc++) {
+ loc = (long)*reloc + offset;
+ if (loc < min_addr || loc > max_addr)
+ error("64-bit relocation outside of kernel!\n");
+ *(u64 *)loc += offset;
+ }
+}
+
+static void kaslr_adjust_got(unsigned long offset)
+{
+ u64 *entry;
+
+ /*
+ * Even without -fPIE, Clang still uses a global offset table for some
+ * reason. Adjust the GOT entries.
+ */
+ for (entry = (u64 *)vmlinux.got_start; entry < (u64 *)vmlinux.got_end; entry++)
+ *entry += offset;
+}
+#endif
+
/*
* Merge information from several sources into a single ident_map_size value.
* "ident_map_size" represents the upper limit of physical memory we may ever
@@ -299,14 +348,19 @@ static void setup_vmalloc_size(void)
vmalloc_size = max(size, vmalloc_size);
}
-static void offset_vmlinux_info(unsigned long offset)
+static void kaslr_adjust_vmlinux_info(unsigned long offset)
{
*(unsigned long *)(&vmlinux.entry) += offset;
vmlinux.bootdata_off += offset;
vmlinux.bootdata_preserved_off += offset;
+#ifdef CONFIG_PIE_BUILD
vmlinux.rela_dyn_start += offset;
vmlinux.rela_dyn_end += offset;
vmlinux.dynsym_start += offset;
+#else
+ vmlinux.got_start += offset;
+ vmlinux.got_end += offset;
+#endif
vmlinux.init_mm_off += offset;
vmlinux.swapper_pg_dir_off += offset;
vmlinux.invalid_pg_dir_off += offset;
@@ -361,6 +415,7 @@ void startup_kernel(void)
detect_physmem_online_ranges(max_physmem_end);
save_ipl_cert_comp_list();
rescue_initrd(safe_addr, ident_map_size);
+ rescue_relocs();
if (kaslr_enabled()) {
vmlinux_lma = randomize_within_range(vmlinux.image_size + vmlinux.bss_size,
@@ -368,7 +423,7 @@ void startup_kernel(void)
ident_map_size);
if (vmlinux_lma) {
__kaslr_offset = vmlinux_lma - vmlinux.default_lma;
- offset_vmlinux_info(__kaslr_offset);
+ kaslr_adjust_vmlinux_info(__kaslr_offset);
}
}
vmlinux_lma = vmlinux_lma ?: vmlinux.default_lma;
@@ -393,18 +448,20 @@ void startup_kernel(void)
/*
* The order of the following operations is important:
*
- * - handle_relocs() must follow clear_bss_section() to establish static
- * memory references to data in .bss to be used by setup_vmem()
+ * - kaslr_adjust_relocs() must follow clear_bss_section() to establish
+ * static memory references to data in .bss to be used by setup_vmem()
* (i.e init_mm.pgd)
*
- * - setup_vmem() must follow handle_relocs() to be able using
+ * - setup_vmem() must follow kaslr_adjust_relocs() to be able using
* static memory references to data in .bss (i.e init_mm.pgd)
*
- * - copy_bootdata() must follow setup_vmem() to propagate changes to
- * bootdata made by setup_vmem()
+ * - copy_bootdata() must follow setup_vmem() to propagate changes
+ * to bootdata made by setup_vmem()
*/
clear_bss_section(vmlinux_lma);
- handle_relocs(__kaslr_offset);
+ kaslr_adjust_relocs(vmlinux_lma, vmlinux_lma + vmlinux.image_size, __kaslr_offset);
+ kaslr_adjust_got(__kaslr_offset);
+ free_relocs();
setup_vmem(asce_limit);
copy_bootdata();
diff --git a/arch/s390/boot/vmem.c b/arch/s390/boot/vmem.c
index 47e1f54c58..09b10bb6e4 100644
--- a/arch/s390/boot/vmem.c
+++ b/arch/s390/boot/vmem.c
@@ -333,7 +333,7 @@ static void pgtable_pmd_populate(pud_t *pud, unsigned long addr, unsigned long e
}
pte = boot_pte_alloc();
pmd_populate(&init_mm, pmd, pte);
- } else if (pmd_large(*pmd)) {
+ } else if (pmd_leaf(*pmd)) {
continue;
}
pgtable_pte_populate(pmd, addr, next, mode);
diff --git a/arch/s390/boot/vmlinux.lds.S b/arch/s390/boot/vmlinux.lds.S
index 389df0e0d9..3d7ea585ab 100644
--- a/arch/s390/boot/vmlinux.lds.S
+++ b/arch/s390/boot/vmlinux.lds.S
@@ -31,6 +31,7 @@ SECTIONS
_text = .; /* Text */
*(.text)
*(.text.*)
+ INIT_TEXT
_etext = . ;
}
.rodata : {
@@ -39,6 +40,9 @@ SECTIONS
*(.rodata.*)
_erodata = . ;
}
+ .got : {
+ *(.got)
+ }
NOTES
.data : {
_data = . ;
@@ -106,6 +110,24 @@ SECTIONS
_compressed_end = .;
}
+#ifndef CONFIG_PIE_BUILD
+ /*
+ * When the kernel is built with CONFIG_KERNEL_UNCOMPRESSED, the entire
+ * uncompressed vmlinux.bin is positioned in the bzImage decompressor
+ * image at the default kernel LMA of 0x100000, enabling it to be
+ * executed in-place. However, the size of .vmlinux.relocs could be
+ * large enough to cause an overlap with the uncompressed kernel at the
+ * address 0x100000. To address this issue, .vmlinux.relocs is
+ * positioned after the .rodata.compressed.
+ */
+ . = ALIGN(4);
+ .vmlinux.relocs : {
+ __vmlinux_relocs_64_start = .;
+ *(.vmlinux.relocs_64)
+ __vmlinux_relocs_64_end = .;
+ }
+#endif
+
#define SB_TRAILER_SIZE 32
/* Trailer needed for Secure Boot */
. += SB_TRAILER_SIZE; /* make sure .sb.trailer does not overwrite the previous section */
@@ -118,8 +140,34 @@ SECTIONS
}
_end = .;
+ DWARF_DEBUG
+ ELF_DETAILS
+
+ /*
+ * Make sure that the .got.plt is either completely empty or it
+ * contains only the three reserved double words.
+ */
+ .got.plt : {
+ *(.got.plt)
+ }
+ ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!")
+
+ /*
+ * Sections that should stay zero sized, which is safer to
+ * explicitly check instead of blindly discarding.
+ */
+ .plt : {
+ *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
+ }
+ ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
+ .rela.dyn : {
+ *(.rela.*) *(.rela_*)
+ }
+ ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
+
/* Sections to be discarded */
/DISCARD/ : {
+ COMMON_DISCARDS
*(.eh_frame)
*(__ex_table)
*(*__ksymtab*)
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-14 12:38:27 +0000