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linux/arch/s390/kernel
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Alexander Gordeev 1642285e51 s390/boot: Fix KASLR base offset off by __START_KERNEL bytes 
Symbol offsets to the KASLR base do not match symbol address in
the vmlinux image. That is the result of setting the KASLR base
to the beginning of .text section as result of an optimization.

Revert that optimization and allocate virtual memory for the
whole kernel image including __START_KERNEL bytes as per the
linker script. That allows keeping the semantics of the KASLR
base offset in sync with other architectures.

Rename __START_KERNEL to TEXT_OFFSET, since it represents the
offset of the .text section within the kernel image, rather than
a virtual address.

Still skip mapping TEXT_OFFSET bytes to save memory on pgtables
and provoke exceptions in case an attempt to access this area is
made, as no kernel symbol may reside there.

In case CONFIG_KASAN is enabled the location counter might exceed
the value of TEXT_OFFSET, while the decompressor linker script
forcefully resets it to TEXT_OFFSET, which leads to a sections
overlap link failure. Use MAX() expression to avoid that.

Reported-by: Omar Sandoval <osandov@osandov.com>
Closes: https://lore.kernel.org/linux-s390/ZnS8dycxhtXBZVky@telecaster.dhcp.thefacebook.com/
Fixes: 56b1069c40 ("s390/boot: Rework deployment of the kernel image")
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
 		2024-08-22 19:24:13 +02:00
..
syscalls syscalls: fix compat_sys_io_pgetevents_time64 usage 2024-06-25 15:57:20 +02:00
vdso32 more s390 updates for 6.10 merge window 2024-05-21 12:09:36 -07:00
vdso64 more s390 updates for 6.10 merge window 2024-05-21 12:09:36 -07:00
.gitignore
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Makefile s390: Remove protvirt and kvm config guards for uv code 2024-07-23 16:02:33 +02:00
abs_lowcore.c s390: Add infrastructure to patch lowcore accesses 2024-07-23 16:02:32 +02:00
alternative.c s390: Add infrastructure to patch lowcore accesses 2024-07-23 16:02:32 +02:00
asm-offsets.c s390/entry: Move SIE indicator flag to thread info 2024-07-23 16:02:31 +02:00
audit.c
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audit.h
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cache.c s390/cache: prevent rebuild of shared_cpu_list 2024-03-07 14:41:15 +01:00
cert_store.c fix missing vmalloc.h includes 2024-04-25 20:55:49 -07:00
compat_audit.c
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compat_linux.c
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compat_linux.h
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compat_ptrace.h
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compat_signal.c s390/fpu: rename save_fpu_regs() to save_user_fpu_regs(), etc 2024-02-16 14:30:15 +01:00
cpcmd.c
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cpufeature.c
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crash_dump.c s390/crash: Do not use VM info if os_info does not have it 2024-06-05 17:03:24 +02:00
ctlreg.c
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debug.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
diag.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
dis.c
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dumpstack.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
early.c s390: Add infrastructure to patch lowcore accesses 2024-07-23 16:02:32 +02:00
early_printk.c
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earlypgm.S
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ebcdic.c
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entry.S s390/entry: Make system_call() ready for lowcore relocation 2024-07-23 16:02:32 +02:00
entry.h s390/switch_to: use generic header file 2024-02-12 15:03:33 +01:00
facility.c
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fpu.c s390/fpu: Re-add exception handling in load_fpu_state() 2024-07-31 16:30:20 +02:00
ftrace.c s390/ftrace: unpoison ftrace_regs in kprobe_ftrace_handler() 2024-07-03 19:30:24 -07:00
ftrace.h
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guarded_storage.c
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head64.S s390/head64: Make startup code ready for lowcore relocation 2024-07-23 16:02:32 +02:00
idle.c s390/idle: Remove duplicate get_lowcore() calls 2024-06-18 17:01:33 +02:00
ima_arch.c
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ipl.c s390/smp: Handle restart interrupt on ipl cpu 2024-07-23 16:02:31 +02:00
ipl_vmparm.c
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irq.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
jump_label.c
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kdebugfs.c
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kexec_elf.c s390, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
kexec_image.c s390, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
kprobes.c more s390 updates for 6.10 merge window 2024-05-21 12:09:36 -07:00
lgr.c
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machine_kexec.c s390/kdump: Make kdump ready for lowcore relocation 2024-07-23 16:02:32 +02:00
machine_kexec_file.c s390, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
machine_kexec_reloc.c
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mcount.S
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module.c arch: make execmem setup available regardless of CONFIG_MODULES 2024-05-14 00:31:44 -07:00
nmi.c s390/nmi: Remove duplicate get_lowcore() calls 2024-06-18 17:01:33 +02:00
nospec-branch.c s390/nospec: Push down alternative handling 2024-07-23 16:02:31 +02:00
nospec-sysfs.c s390/nospec: Push down alternative handling 2024-07-23 16:02:31 +02:00
numa.c
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os_info.c s390/os_info: Fix array size in struct os_info 2024-04-29 17:33:29 +02:00
perf_cpum_cf.c s390/cpum_cf: Fix endless loop in CF_DIAG event stop 2024-07-23 16:02:30 +02:00
perf_cpum_cf_events.c s390/cpum_cf: make crypto counters upward compatible across machine types 2024-04-09 17:29:56 +02:00
perf_cpum_sf.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
perf_event.c s390/stacktrace: Merge perf_callchain_user() and arch_stack_walk_user() 2024-05-14 13:37:06 +02:00
perf_pai_crypto.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
perf_pai_ext.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
perf_regs.c s390/fpu: remove anonymous union from struct fpu 2024-02-16 14:30:16 +01:00
process.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
processor.c s390/alternatives: Move text sync functions 2024-07-23 16:02:31 +02:00
ptrace.c s390/fpu: remove anonymous union from struct fpu 2024-02-16 14:30:16 +01:00
reipl.S s390/kdump: Make kdump ready for lowcore relocation 2024-07-23 16:02:32 +02:00
relocate_kernel.S
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rethook.c
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rethook.h
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runtime_instr.c
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setup.c s390/mm: Prevent lowcore vs identity mapping overlap 2024-08-21 16:14:45 +02:00
signal.c s390/fpu: rename save_fpu_regs() to save_user_fpu_regs(), etc 2024-02-16 14:30:15 +01:00
smp.c s390: Move CIF flags to struct pcpu 2024-07-23 16:02:31 +02:00
stacktrace.c s390/stackstrace: Detect vdso stack frames 2024-05-14 13:37:07 +02:00
sthyi.c s390/sthyi: Use cached data when diag is busy 2024-07-10 19:50:45 +02:00
syscall.c s390 updates for 6.11 merge window 2024-07-18 15:41:45 -07:00
sysinfo.c s390/sysinfo: allow response buffer in normal memory 2024-03-13 09:23:44 +01:00
text_amode31.S
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time.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
topology.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
trace.c
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traps.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
unwind_bc.c s390/unwind: disable KMSAN checks 2024-07-03 19:30:25 -07:00
uprobes.c s390/switch_to: use generic header file 2024-02-12 15:03:33 +01:00
uv.c s390: Remove protvirt and kvm config guards for uv code 2024-07-23 16:02:33 +02:00
vdso.c s390/stackstrace: Detect vdso stack frames 2024-05-14 13:37:07 +02:00
vmcore_info.c s390/vmcoreinfo: Store virtual memory layout 2024-04-17 13:38:01 +02:00
vmlinux.lds.S s390/boot: Fix KASLR base offset off by __START_KERNEL bytes 2024-08-22 19:24:13 +02:00
vtime.c s390/vtime: Remove duplicate get_lowcore() calls 2024-06-18 17:01:33 +02:00