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Andrey Ryabinin e26c761f5a ARM: 8320/1: fix integer overflow in ELF_ET_DYN_BASE 
commit 8defb3367f upstream.

Usually ELF_ET_DYN_BASE is 2/3 of TASK_SIZE. With 3G/1G user/kernel
split this is not so, because 2*TASK_SIZE overflows 32 bits,
so the actual value of ELF_ET_DYN_BASE is:
	(2 * TASK_SIZE / 3) = 0x2a000000

When ASLR is disabled PIE binaries will load at ELF_ET_DYN_BASE address.
On 32bit platforms AddressSanitzer uses addresses [0x20000000 - 0x40000000]
for shadow memory [1]. So ASan doesn't work for PIE binaries when ASLR disabled
as it fails to map shadow memory.
Also after Kees's 'split ET_DYN ASLR from mmap ASLR' patchset PIE binaries
has a high chance of loading somewhere in between [0x2a000000 - 0x40000000]
even if ASLR enabled. This makes ASan with PIE absolutely incompatible.

Fix overflow by dividing TASK_SIZE prior to multiplying.
After this patch ELF_ET_DYN_BASE equals to (for CONFIG_VMSPLIT_3G=y):
	(TASK_SIZE / 3 * 2) = 0x7f555554

[1] https://code.google.com/p/address-sanitizer/wiki/AddressSanitizerAlgorithm#Mapping

Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Reported-by: Maria Guseva <m.guseva@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-05-06 21:56:21 +02:00
..
hardware ARM: arm-soc: late cleanups 2013-05-07 11:22:14 -07:00
mach Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-05-03 09:13:19 -07:00
xen xen/arm: implement HYPERVISOR_vcpu_op 2013-04-25 16:46:07 +00:00
arch_timer.h clocksource: arch_timer: use virtual counters 2014-01-09 12:24:26 -08:00
asm-offsets.h
assembler.h ARM: virt: avoid clobbering lr when forcing svc mode 2013-01-10 21:09:31 +00:00
atomic.h ARM: 7867/1: include: asm: use 'int' instead of 'unsigned long' for 'oldval' in atomic_cmpxchg(). 2015-02-05 22:35:38 -08:00
barrier.h ARM: kill off arch_is_coherent 2012-10-02 08:58:07 +02:00
bitops.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
bug.h ARM: Correct BUG() assembly to ensure it is endian-agnostic 2014-11-21 09:22:55 -08:00
bugs.h
cache.h ARM: implement support for read-mostly sections 2010-12-05 08:39:36 +00:00
cacheflush.h ARM: 7957/1: add DSB after icache flush in __flush_icache_all() 2014-03-06 21:30:01 -08:00
cachetype.h ARM: 7062/1: cache: detect PIPT I-cache using CTR 2011-10-17 09:13:41 +01:00
checksum.h
clkdev.h ARM: Consolidate the clkdev header files 2011-07-19 18:09:45 +02:00
cmpxchg.h ARM: 7720/1: ARM v6/v7 cmpxchg64 shouldn't clear upper 32 bits of the old/new value 2013-05-13 23:42:24 +01:00
compiler.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
cp15.h ARM: make cr_alignment read-only #ifndef CONFIG_CPU_CP15 2013-01-31 21:44:45 +01:00
cpu.h ARM: kernel: add MIDR to per-CPU information data 2012-11-19 14:51:11 +00:00
cpuidle.h cpuidle: Add common time keeping and irq enabling 2012-03-21 01:59:40 -04:00
cputype.h ARM: 7763/1: kernel: fix __cpu_logical_map default initialization 2013-06-24 14:28:43 +01:00
cti.h ARM: coresight: common definition for (OS) Lock Access Register key value 2013-01-10 21:13:05 +00:00
delay.h ARM: 7685/1: delay: use private ticks_per_jiffy field for timer-based delay ops 2013-04-03 16:45:50 +01:00
device.h ARM: dma-mapping: Add macro to_dma_iommu_mapping() 2013-02-25 15:30:41 +01:00
div64.h ARM: 8027/1: fix do_div() bug in big-endian systems 2014-05-06 07:55:27 -07:00
dma-contiguous.h ARM: integrate CMA with DMA-mapping subsystem 2012-05-21 15:09:38 +02:00
dma-iommu.h ARM: dma-mapping: Add arm_iommu_detach_device() 2013-02-25 15:30:41 +01:00
dma-mapping.h IOMMU Updates for Linux v3.8 2012-12-20 10:07:25 -08:00
dma.h ARM: disable virt_to_bus/virt_to_bus almost everywhere 2013-02-14 15:04:33 +01:00
domain.h ARM: fix set_domain() macro 2012-07-05 09:50:55 +01:00
ecard.h ARM: io: ecard: move ioaddr() inside __ecard_address 2011-08-17 08:44:16 +01:00
edac.h ARM: 7201/1: add EDAC atomic_scrub function 2011-12-11 08:35:50 +00:00
elf.h ARM: 8320/1: fix integer overflow in ELF_ET_DYN_BASE 2015-05-06 21:56:21 +02:00
entry-macro-multi.S ARM: gic: consolidate PPI handling 2011-10-23 13:32:29 +01:00
exception.h ARM: 7115/4: move __exception and friends to asm/exception.h 2011-10-17 09:02:44 +01:00
fb.h
fiq.h ARM: 6940/1: fiq: Briefly document driver responsibilities for suspend/resume 2011-05-26 10:31:06 +01:00
firmware.h ARM: Add interface for registering and calling firmware-specific operations 2013-04-09 01:52:06 +09:00
fixmap.h
flat.h ARM: binfmt_flat: unused variable 'persistent' 2012-10-09 20:29:06 +02:00
floppy.h
fncpy.h ARM: 6640/1: Thumb-2: Symbol manipulation macros for function body copying 2011-01-27 11:48:58 +00:00
fpstate.h Fix common misspellings 2011-03-31 11:26:23 -03:00
ftrace.h
futex.h ARM: 7954/1: mm: remove remaining domain support from ARMv6 2014-05-06 07:55:26 -07:00
glue-cache.h ARM: cache: remove ARMv3 support code 2013-03-26 09:55:23 +00:00
glue-df.h ARM: sync comments about available data abort models with the code 2013-01-31 21:44:46 +01:00
glue-pf.h ARM: move cache/processor/fault glue to separate include files 2011-02-12 11:52:21 +00:00
glue-proc.h ARM: 7773/1: PJ4B: Add support for errata 4742 2013-06-24 14:28:46 +01:00
glue.h Fix common misspellings 2011-03-31 11:26:23 -03:00
gpio.h ARM: make mach/gpio.h headers optional 2012-09-14 09:21:59 -05:00
hardirq.h ARM: 7536/1: smp: Formalize an IPI for wakeup 2012-09-19 21:52:08 +01:00
highmem.h ARM: 7684/1: errata: Workaround for Cortex-A15 erratum 798181 (TLBI/DSB operations) 2013-04-03 16:45:49 +01:00
hw_breakpoint.h ARM: hw_breakpoint: Check function for OS Save and Restore mechanism 2013-01-10 21:13:06 +00:00
hw_irq.h arm: dove: Use proper irq accessor functions 2011-03-29 14:47:57 +02:00
hwcap.h UAPI: (Scripted) Disintegrate arch/arm/include/asm 2012-10-12 13:05:52 +01:00
hypervisor.h arm: initial Xen support 2012-09-14 13:53:39 +00:00
ide.h
idmap.h ARM: KVM: move to a KVM provided HYP idmap 2013-04-28 22:23:08 -07:00
io.h ARM: 7728/1: mm: Use phys_addr_t properly for ioremap functions 2014-05-06 07:55:27 -07:00
irq.h arm: Move the set_handle_irq and handle_arch_irq declarations to asm/irq.h 2013-03-26 16:11:20 +00:00
irqflags.h Fix IRQ flag handling naming 2010-10-07 14:08:55 +01:00
jump_label.h compiler/gcc4: Add quirk for 'asm goto' miscompilation bug 2013-10-18 07:45:45 -07:00
Kbuild Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-12-12 11:30:02 -08:00
kexec.h [ARM] add machine-specific hook to machine_kexec 2011-03-03 16:26:55 -05:00
kgdb.h kgdb,arm: fix register dump 2010-10-29 13:14:40 -05:00
kmap_types.h arm: remove km_type definitions 2012-07-24 15:27:28 +08:00
kprobes.h Kernel: Audit Support For The ARM Platform 2012-01-17 16:17:01 -05:00
kvm_arch_timer.h ARM: KVM: arch_timers: Add guest timer core support 2013-02-11 19:05:11 +00:00
kvm_arm.h ARM: KVM: abstract S1TW abort detection away 2013-03-06 15:48:42 -08:00
kvm_asm.h ARM: KVM: perform save/restore of PAR 2013-08-20 08:43:03 -07:00
kvm_coproc.h KVM: ARM: User space API for getting/setting co-proc registers 2013-01-23 13:29:14 -05:00
kvm_emulate.h ARM: KVM: move kvm_handle_wfi to handle_exit.c 2013-03-06 15:48:45 -08:00
kvm_host.h ARM: KVM: promote vfp_host pointer to generic host cpu context 2013-04-28 22:23:13 -07:00
kvm_mmio.h KVM: ARM: Handle I/O aborts 2013-01-23 13:29:17 -05:00
kvm_mmu.h ARM: KVM: perform HYP initilization for hotplugged CPUs 2013-04-28 22:23:11 -07:00
kvm_psci.h KVM: ARM: Power State Coordination Interface implementation 2013-01-23 13:29:18 -05:00
kvm_vgic.h ARM: KVM: remove superfluous include from kvm_vgic.h 2013-03-06 15:48:44 -08:00
limits.h
linkage.h
localtimer.h ARM: local timers: make the runtime registration interface mandatory 2012-03-13 13:45:55 +00:00
mach-types.h
mc146818rtc.h ARM: mc146818rtc: remove unnecessary include of mach/irqs.h 2012-01-25 20:37:45 -06:00
mcpm.h ARM: mcpm: provide an interface to set the SMP ops at run time 2013-04-24 10:37:03 -04:00
memblock.h ARM: Add arm_memblock_steal() to allocate memory away from the kernel 2012-01-13 15:02:35 +00:00
memory.h ARM: 7931/1: Correct virt_addr_valid 2015-02-05 22:35:39 -08:00
mmu.h ARM: 7790/1: Fix deferred mm switch on VIVT processors 2013-08-11 18:35:20 -07:00
mmu_context.h ARM: 7790/1: Fix deferred mm switch on VIVT processors 2013-08-11 18:35:20 -07:00
module.h ARM: 7829/1: Add ".text.unlikely" and ".text.hot" to arm unwind tables 2015-02-05 22:35:38 -08:00
mtd-xip.h
mutex.h ARM: 7495/1: mutex: use generic atomic_dec-based implementation for ARMv6+ 2012-08-25 09:22:31 +01:00
nwflash.h
opcodes-sec.h ARM: opcodes: add opcodes definitions for ARM security extensions 2013-01-10 21:10:20 +00:00
opcodes-virt.h ARM: opcodes: add __ERET/__MSR_ELR_HYP instruction encoding 2012-09-19 08:32:49 +01:00
opcodes.h ARM: opcodes: add missing include of linux/linkage.h 2013-01-10 21:10:20 +00:00
outercache.h ARM: move outer_cache declaration out of ifdef 2014-03-31 09:58:13 -07:00
page-nommu.h
page.h ARM: LPAE: use signed arithmetic for mask definitions 2015-02-05 22:35:38 -08:00
pci.h PCI: collapse pcibios_resource_to_bus 2012-02-23 20:19:04 -07:00
percpu.h ARM: 7747/1: pcpu: ensure __my_cpu_offset cannot be re-ordered across barrier() 2013-06-05 23:35:56 +01:00
perf_event.h ARM: 7584/1: perf: fix link error when CONFIG_HW_PERF_EVENTS is not selected 2012-11-23 13:01:30 +00:00
pgalloc.h ARM: LPAE: Page table maintenance for the 3-level format 2011-12-08 10:30:39 +00:00
pgtable-2level-hwdef.h ARM: 7077/1: LPAE: Use a mask for physical addresses in page table entries 2011-10-06 15:40:06 +01:00
pgtable-2level-types.h ARM: 7076/1: LPAE: Add (pte|pmd)val_t type definitions as u32 2011-10-06 15:40:05 +01:00
pgtable-2level.h ARM: 7954/1: mm: remove remaining domain support from ARMv6 2014-05-06 07:55:26 -07:00
pgtable-3level-hwdef.h ARM: 8109/1: mm: Modify pte_write and pmd_write logic for LPAE 2015-02-05 22:35:39 -08:00
pgtable-3level-types.h ARM: LPAE: Introduce the 3-level page table format definitions 2011-12-08 10:30:39 +00:00
pgtable-3level.h ARM: 8109/1: mm: Modify pte_write and pmd_write logic for LPAE 2015-02-05 22:35:39 -08:00
pgtable-hwdef.h ARM: LPAE: Introduce the 3-level page table format definitions 2011-12-08 10:30:39 +00:00
pgtable-nommu.h Remove remaining bits of io_remap_page_range() 2012-03-23 16:58:31 -07:00
pgtable.h ARM: 8108/1: mm: Introduce {pte,pmd}_isset and {pte,pmd}_isclear 2015-02-05 22:35:39 -08:00
pmu.h ARM: perf: consistently use arm_pmu->name for PMU name 2012-11-09 11:37:26 +00:00
proc-fns.h ARM: LPAE: Page table maintenance for the 3-level format 2011-12-08 10:30:39 +00:00
processor.h ARM: 7791/1: a.out: remove partial a.out support 2013-08-11 18:35:20 -07:00
procinfo.h
prom.h Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-12-12 11:30:02 -08:00
psci.h ARM: psci: add support for PSCI invocations from the kernel 2013-01-10 21:10:20 +00:00
ptrace.h UAPI: (Scripted) Disintegrate arch/arm/include/asm 2012-10-12 13:05:52 +01:00
scatterlist.h ARM: Allow SoCs to enable scatterlist chaining 2011-06-02 11:16:22 +01:00
sched_clock.h ARM: make sched_clock just call a function pointer 2013-04-10 18:27:12 -05:00
seccomp.h
setup.h UAPI: (Scripted) Disintegrate arch/arm/include/asm 2012-10-12 13:05:52 +01:00
shmparam.h
signal.h arm: switch to generic old sigaction() 2013-02-03 18:15:47 -05:00
smp.h ARM: 7571/1: SMP: add function arch_send_wakeup_ipi_mask() 2012-11-13 11:47:40 +00:00
smp_plat.h ARM: 7763/1: kernel: fix __cpu_logical_map default initialization 2013-06-24 14:28:43 +01:00
smp_scu.h arm-soc: soc-specific updates 2013-02-21 15:27:22 -08:00
smp_twd.h ARM: smp_twd: convert to use CLKSRC_OF init 2013-03-11 08:42:08 -05:00
sparsemem.h
spinlock.h ARM: 7811/1: locks: use early clobber in arch_spin_trylock 2014-03-23 21:38:13 -07:00
spinlock_types.h ARM: 7446/1: spinlock: use ticket algorithm for ARMv6+ locking implementation 2012-07-09 17:41:10 +01:00
stackprotector.h
stacktrace.h
string.h
suspend.h ARM: pm: preallocate a page table for suspend/resume 2011-09-20 23:33:36 +01:00
swab.h UAPI: (Scripted) Disintegrate arch/arm/include/asm 2012-10-12 13:05:52 +01:00
switch_to.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
sync_bitops.h xen/arm: sync_bitops 2012-08-08 16:34:01 +00:00
syscall.h ARM: 7851/1: check for number of arguments in syscall_get/set_arguments() 2013-11-04 04:31:06 -08:00
system.h the only place that needs to include asm/exec.h is linux/binfmts.h 2012-09-20 09:51:13 -04:00
system_info.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
system_misc.h arm: Use generic idle loop 2013-04-08 17:39:24 +02:00
tcm.h ARM: 6985/1: export functions to determine the presence of I/DTCM 2011-07-06 20:49:45 +01:00
therm.h
thread_info.h ARM: 7790/1: Fix deferred mm switch on VIVT processors 2013-08-11 18:35:20 -07:00
thread_notify.h ARM: 6867/1: Introduce THREAD_NOTIFY_COPY for copy_thread() hooks 2011-04-10 21:13:36 +01:00
timex.h Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-10-07 21:20:57 +09:00
tlb.h Fix TLB gather virtual address range invalidation corner cases 2013-08-20 08:43:05 -07:00
tlbflush.h Merge branches 'devel-stable', 'entry', 'fixes', 'mach-types', 'misc' and 'smp-hotplug' into for-linus 2013-05-02 21:30:36 +01:00
tls.h ARM: 7403/1: tls: remove covert channel via TPIDRURW 2012-04-28 11:01:30 +01:00
topology.h ARM: 7182/1: ARM cpu topology: fix warning 2011-11-30 23:55:21 +00:00
traps.h ARM: earlier initialization of vectors page 2012-01-23 10:24:11 +00:00
uaccess.h ARM: 8051/1: put_user: fix possible data corruption in put_user 2014-06-11 12:03:23 -07:00
ucontext.h Fix common misspellings 2011-03-31 11:26:23 -03:00
unified.h ARM: make BSYM macro assembly only 2012-01-16 08:56:25 -06:00
unistd.h ARM: 8007/1: Remove extraneous kcmp syscall ignore 2014-05-06 07:55:26 -07:00
unwind.h ARM: 7187/1: fix unwinding for XIP kernels 2011-12-06 11:16:13 +00:00
user.h ARM: 6798/1: aout-core: zero thread debug registers in a.out core dump 2011-03-10 15:16:29 +00:00
vfp.h
vfpmacros.h ARM: 7566/1: vfp: fix save and restore when running on pre-VFPv3 and CONFIG_VFPv3 set 2012-10-29 10:04:05 +00:00
vga.h ARM: set vga memory base at run-time 2011-07-12 11:19:29 -05:00
virt.h ARM: virt: use PSR_N_BIT for detecting boot CPU mode mismatch 2013-01-10 21:09:32 +00:00
word-at-a-time.h ARM: 7450/1: dcache: select DCACHE_WORD_ACCESS for little-endian ARMv6+ CPUs 2012-07-09 17:41:11 +01:00
xor.h