| Message ID | 1448325908-8185-8-git-send-email-tim.gardner@canonical.com |
|---|---|
| State | New |
| Headers | show |
On 24.11.2015 01:45, tim.gardner@canonical.com wrote: > From: Kees Cook <keescook@chromium.org> > > BugLink: http://bugs.launchpad.net/bugs/1518483 > > When an architecture fully supports randomizing the ELF load location, > a per-arch mmap_rnd() function is used to find a randomized mmap base. > In preparation for randomizing the location of ET_DYN binaries > separately from mmap, this renames and exports these functions as > arch_mmap_rnd(). Additionally introduces CONFIG_ARCH_HAS_ELF_RANDOMIZE > for describing this feature on architectures that support it > (which is a superset of ARCH_BINFMT_ELF_RANDOMIZE_PIE, since s390 > already supports a separated ET_DYN ASLR from mmap ASLR without the > ARCH_BINFMT_ELF_RANDOMIZE_PIE logic). > > Signed-off-by: Kees Cook <keescook@chromium.org> > Cc: Hector Marco-Gisbert <hecmargi@upv.es> > Cc: Russell King <linux@arm.linux.org.uk> > Reviewed-by: Ingo Molnar <mingo@kernel.org> > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Will Deacon <will.deacon@arm.com> > Cc: Ralf Baechle <ralf@linux-mips.org> > Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> > Cc: Paul Mackerras <paulus@samba.org> > Cc: Michael Ellerman <mpe@ellerman.id.au> > Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> > Cc: Heiko Carstens <heiko.carstens@de.ibm.com> > Cc: Alexander Viro <viro@zeniv.linux.org.uk> > Cc: Oleg Nesterov <oleg@redhat.com> > Cc: Andy Lutomirski <luto@amacapital.net> > Cc: "David A. Long" <dave.long@linaro.org> > Cc: Andrey Ryabinin <a.ryabinin@samsung.com> > Cc: Arun Chandran <achandran@mvista.com> > Cc: Yann Droneaud <ydroneaud@opteya.com> > Cc: Min-Hua Chen <orca.chen@gmail.com> > Cc: Paul Burton <paul.burton@imgtec.com> > Cc: Alex Smith <alex@alex-smith.me.uk> > Cc: Markos Chandras <markos.chandras@imgtec.com> > Cc: Vineeth Vijayan <vvijayan@mvista.com> > Cc: Jeff Bailey <jeffbailey@google.com> > Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com> > Cc: Ben Hutchings <ben@decadent.org.uk> > Cc: Behan Webster <behanw@converseincode.com> > Cc: Ismael Ripoll <iripoll@upv.es> > Cc: Jan-Simon Mller <dl9pf@gmx.de> > Signed-off-by: Andrew Morton <akpm@linux-foundation.org> > Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> > (back ported from commit 2b68f6caeac271620cd2f9362aeaed360e317df0) > Signed-off-by: Tim Gardner <tim.gardner@canonical.com> > > Conflicts: > arch/Kconfig > --- > arch/Kconfig | 11 +++++++++++ > arch/arm/Kconfig | 1 + > arch/arm/mm/mmap.c | 4 ++-- > arch/arm64/Kconfig | 1 + > arch/arm64/mm/mmap.c | 4 ++-- > arch/mips/Kconfig | 1 + > arch/mips/mm/mmap.c | 4 ++-- > arch/powerpc/Kconfig | 1 + > arch/powerpc/mm/mmap.c | 4 ++-- > arch/s390/Kconfig | 1 + > arch/s390/mm/mmap.c | 8 ++++---- > arch/x86/Kconfig | 1 + > arch/x86/mm/mmap.c | 4 ++-- > include/linux/elf-randomize.h | 10 ++++++++++ > 14 files changed, 41 insertions(+), 14 deletions(-) > create mode 100644 include/linux/elf-randomize.h > > diff --git a/arch/Kconfig b/arch/Kconfig > index 05d7a8a..45a80db 100644 > --- a/arch/Kconfig > +++ b/arch/Kconfig > @@ -484,6 +484,17 @@ config HAVE_IRQ_EXIT_ON_IRQ_STACK > This spares a stack switch and improves cache usage on softirq > processing. > > +config PGTABLE_LEVELS > + int > + default 2 > + Why adding PGTABLE_LEVELS? Unlikely that it matters but it does not seem to be necessary either... > +config ARCH_HAS_ELF_RANDOMIZE > + bool > + help > + An architecture supports choosing randomized locations for > + stack, mmap, brk, and ET_DYN. Defined functions: > + - arch_mmap_rnd() > + > # > # ABI hall of shame > # > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > index a4c5248..b5f2ad0 100644 > --- a/arch/arm/Kconfig > +++ b/arch/arm/Kconfig > @@ -3,6 +3,7 @@ config ARM > default y > select ARCH_BINFMT_ELF_RANDOMIZE_PIE > select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE > + select ARCH_HAS_ELF_RANDOMIZE > select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST > select ARCH_HAVE_CUSTOM_GPIO_H > select ARCH_HAS_GCOV_PROFILE_ALL > diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c > index 15a8160..407dc78 100644 > --- a/arch/arm/mm/mmap.c > +++ b/arch/arm/mm/mmap.c > @@ -169,7 +169,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, > return addr; > } > > -static unsigned long mmap_rnd(void) > +unsigned long arch_mmap_rnd(void) > { > unsigned long rnd; > > @@ -184,7 +184,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) > unsigned long random_factor = 0UL; > > if (current->flags & PF_RANDOMIZE) > - random_factor = mmap_rnd(); > + random_factor = arch_mmap_rnd(); > > if (mmap_is_legacy()) { > mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index a26ee9e..690f553 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -2,6 +2,7 @@ config ARM64 > def_bool y > select ARCH_BINFMT_ELF_RANDOMIZE_PIE > select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE > + select ARCH_HAS_ELF_RANDOMIZE > select ARCH_HAS_GCOV_PROFILE_ALL > select ARCH_HAS_SG_CHAIN > select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST > diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c > index ba776c0..ed17747 100644 > --- a/arch/arm64/mm/mmap.c > +++ b/arch/arm64/mm/mmap.c > @@ -47,7 +47,7 @@ static int mmap_is_legacy(void) > return sysctl_legacy_va_layout; > } > > -static unsigned long mmap_rnd(void) > +unsigned long arch_mmap_rnd(void) > { > unsigned long rnd; > > @@ -77,7 +77,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) > unsigned long random_factor = 0UL; > > if (current->flags & PF_RANDOMIZE) > - random_factor = mmap_rnd(); > + random_factor = arch_mmap_rnd(); > > /* > * Fall back to the standard layout if the personality bit is set, or > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig > index 5a38e76..1f7b4f1 100644 > --- a/arch/mips/Kconfig > +++ b/arch/mips/Kconfig > @@ -24,6 +24,7 @@ config MIPS > select HAVE_DEBUG_KMEMLEAK > select HAVE_SYSCALL_TRACEPOINTS > select ARCH_BINFMT_ELF_RANDOMIZE_PIE > + select ARCH_HAS_ELF_RANDOMIZE > select HAVE_ARCH_TRANSPARENT_HUGEPAGE if CPU_SUPPORTS_HUGEPAGES && 64BIT > select RTC_LIB if !MACH_LOONGSON > select GENERIC_ATOMIC64 if !64BIT > diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c > index 9a4f1f5..5c81fdd 100644 > --- a/arch/mips/mm/mmap.c > +++ b/arch/mips/mm/mmap.c > @@ -142,7 +142,7 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp, > addr0, len, pgoff, flags, DOWN); > } > > -static unsigned long mmap_rnd(void) > +unsigned long arch_mmap_rnd(void) > { > unsigned long rnd; > > @@ -161,7 +161,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) > unsigned long random_factor = 0UL; > > if (current->flags & PF_RANDOMIZE) > - random_factor = mmap_rnd(); > + random_factor = arch_mmap_rnd(); > > if (mmap_is_legacy()) { > mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 6ff43fd..132e6c5 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -89,6 +89,7 @@ config PPC > select ARCH_MIGHT_HAVE_PC_SERIO > select BINFMT_ELF > select ARCH_BINFMT_ELF_RANDOMIZE_PIE > + select ARCH_HAS_ELF_RANDOMIZE > select OF > select OF_EARLY_FLATTREE > select OF_RESERVED_MEM > diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c > index 1ad2299..0f0502e 100644 > --- a/arch/powerpc/mm/mmap.c > +++ b/arch/powerpc/mm/mmap.c > @@ -53,7 +53,7 @@ static inline int mmap_is_legacy(void) > return sysctl_legacy_va_layout; > } > > -static unsigned long mmap_rnd(void) > +unsigned long arch_mmap_rnd(void) > { > unsigned long rnd; > > @@ -87,7 +87,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) > unsigned long random_factor = 0UL; > > if (current->flags & PF_RANDOMIZE) > - random_factor = mmap_rnd(); > + random_factor = arch_mmap_rnd(); > > /* > * Fall back to the standard layout if the personality > diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig > index 68b68d7..d64fca0 100644 > --- a/arch/s390/Kconfig > +++ b/arch/s390/Kconfig > @@ -65,6 +65,7 @@ config S390 > def_bool y > select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE > select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS > + select ARCH_HAS_ELF_RANDOMIZE > select ARCH_HAS_GCOV_PROFILE_ALL > select ARCH_HAVE_NMI_SAFE_CMPXCHG > select ARCH_INLINE_READ_LOCK > diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c > index d891d40..60943a4 100644 > --- a/arch/s390/mm/mmap.c > +++ b/arch/s390/mm/mmap.c > @@ -56,7 +56,7 @@ static inline int mmap_is_legacy(void) > return sysctl_legacy_va_layout; > } > > -static unsigned long mmap_rnd(void) > +unsigned long arch_mmap_rnd(void) > { > if (is_32bit_task()) > return (get_random_int() & 0x7ff) << PAGE_SHIFT; > @@ -183,7 +183,7 @@ unsigned long randomize_et_dyn(void) > base &= ~((1UL << 32) - 1); > > if (current->flags & PF_RANDOMIZE) > - base += mmap_rnd(); > + base += arch_mmap_rnd(); > > return base; > } > @@ -199,7 +199,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) > unsigned long random_factor = 0UL; > > if (current->flags & PF_RANDOMIZE) > - random_factor = mmap_rnd(); > + random_factor = arch_mmap_rnd(); > > /* > * Fall back to the standard layout if the personality > @@ -279,7 +279,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) > unsigned long random_factor = 0UL; > > if (current->flags & PF_RANDOMIZE) > - random_factor = mmap_rnd(); > + random_factor = arch_mmap_rnd(); > > /* > * Fall back to the standard layout if the personality > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index c05d389..e8071d8 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -86,6 +86,7 @@ config X86 > select HAVE_ARCH_KMEMCHECK > select HAVE_USER_RETURN_NOTIFIER > select ARCH_BINFMT_ELF_RANDOMIZE_PIE > + select ARCH_HAS_ELF_RANDOMIZE > select HAVE_ARCH_JUMP_LABEL > select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE > select SPARSE_IRQ > diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c > index 0d9f14a..844b06d 100644 > --- a/arch/x86/mm/mmap.c > +++ b/arch/x86/mm/mmap.c > @@ -65,7 +65,7 @@ static int mmap_is_legacy(void) > return sysctl_legacy_va_layout; > } > > -static unsigned long mmap_rnd(void) > +unsigned long arch_mmap_rnd(void) > { > unsigned long rnd; > > @@ -114,7 +114,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) > unsigned long random_factor = 0UL; > > if (current->flags & PF_RANDOMIZE) > - random_factor = mmap_rnd(); > + random_factor = arch_mmap_rnd(); > > mm->mmap_legacy_base = mmap_legacy_base(random_factor); > > diff --git a/include/linux/elf-randomize.h b/include/linux/elf-randomize.h > new file mode 100644 > index 0000000..7a4eda0 > --- /dev/null > +++ b/include/linux/elf-randomize.h > @@ -0,0 +1,10 @@ > +#ifndef _ELF_RANDOMIZE_H > +#define _ELF_RANDOMIZE_H > + > +#ifndef CONFIG_ARCH_HAS_ELF_RANDOMIZE > +static inline unsigned long arch_mmap_rnd(void) { return 0; } > +#else > +extern unsigned long arch_mmap_rnd(void); > +#endif > + > +#endif >
diff --git a/arch/Kconfig b/arch/Kconfig index 05d7a8a..45a80db 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -484,6 +484,17 @@ config HAVE_IRQ_EXIT_ON_IRQ_STACK This spares a stack switch and improves cache usage on softirq processing. +config PGTABLE_LEVELS + int + default 2 + +config ARCH_HAS_ELF_RANDOMIZE + bool + help + An architecture supports choosing randomized locations for + stack, mmap, brk, and ET_DYN. Defined functions: + - arch_mmap_rnd() + # # ABI hall of shame # diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a4c5248..b5f2ad0 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -3,6 +3,7 @@ config ARM default y select ARCH_BINFMT_ELF_RANDOMIZE_PIE select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE + select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAVE_CUSTOM_GPIO_H select ARCH_HAS_GCOV_PROFILE_ALL diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index 15a8160..407dc78 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -169,7 +169,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, return addr; } -static unsigned long mmap_rnd(void) +unsigned long arch_mmap_rnd(void) { unsigned long rnd; @@ -184,7 +184,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) unsigned long random_factor = 0UL; if (current->flags & PF_RANDOMIZE) - random_factor = mmap_rnd(); + random_factor = arch_mmap_rnd(); if (mmap_is_legacy()) { mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index a26ee9e..690f553 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2,6 +2,7 @@ config ARM64 def_bool y select ARCH_BINFMT_ELF_RANDOMIZE_PIE select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE + select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_SG_CHAIN select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c index ba776c0..ed17747 100644 --- a/arch/arm64/mm/mmap.c +++ b/arch/arm64/mm/mmap.c @@ -47,7 +47,7 @@ static int mmap_is_legacy(void) return sysctl_legacy_va_layout; } -static unsigned long mmap_rnd(void) +unsigned long arch_mmap_rnd(void) { unsigned long rnd; @@ -77,7 +77,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) unsigned long random_factor = 0UL; if (current->flags & PF_RANDOMIZE) - random_factor = mmap_rnd(); + random_factor = arch_mmap_rnd(); /* * Fall back to the standard layout if the personality bit is set, or diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 5a38e76..1f7b4f1 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -24,6 +24,7 @@ config MIPS select HAVE_DEBUG_KMEMLEAK select HAVE_SYSCALL_TRACEPOINTS select ARCH_BINFMT_ELF_RANDOMIZE_PIE + select ARCH_HAS_ELF_RANDOMIZE select HAVE_ARCH_TRANSPARENT_HUGEPAGE if CPU_SUPPORTS_HUGEPAGES && 64BIT select RTC_LIB if !MACH_LOONGSON select GENERIC_ATOMIC64 if !64BIT diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c index 9a4f1f5..5c81fdd 100644 --- a/arch/mips/mm/mmap.c +++ b/arch/mips/mm/mmap.c @@ -142,7 +142,7 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp, addr0, len, pgoff, flags, DOWN); } -static unsigned long mmap_rnd(void) +unsigned long arch_mmap_rnd(void) { unsigned long rnd; @@ -161,7 +161,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) unsigned long random_factor = 0UL; if (current->flags & PF_RANDOMIZE) - random_factor = mmap_rnd(); + random_factor = arch_mmap_rnd(); if (mmap_is_legacy()) { mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 6ff43fd..132e6c5 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -89,6 +89,7 @@ config PPC select ARCH_MIGHT_HAVE_PC_SERIO select BINFMT_ELF select ARCH_BINFMT_ELF_RANDOMIZE_PIE + select ARCH_HAS_ELF_RANDOMIZE select OF select OF_EARLY_FLATTREE select OF_RESERVED_MEM diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c index 1ad2299..0f0502e 100644 --- a/arch/powerpc/mm/mmap.c +++ b/arch/powerpc/mm/mmap.c @@ -53,7 +53,7 @@ static inline int mmap_is_legacy(void) return sysctl_legacy_va_layout; } -static unsigned long mmap_rnd(void) +unsigned long arch_mmap_rnd(void) { unsigned long rnd; @@ -87,7 +87,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) unsigned long random_factor = 0UL; if (current->flags & PF_RANDOMIZE) - random_factor = mmap_rnd(); + random_factor = arch_mmap_rnd(); /* * Fall back to the standard layout if the personality diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 68b68d7..d64fca0 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -65,6 +65,7 @@ config S390 def_bool y select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS + select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAVE_NMI_SAFE_CMPXCHG select ARCH_INLINE_READ_LOCK diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c index d891d40..60943a4 100644 --- a/arch/s390/mm/mmap.c +++ b/arch/s390/mm/mmap.c @@ -56,7 +56,7 @@ static inline int mmap_is_legacy(void) return sysctl_legacy_va_layout; } -static unsigned long mmap_rnd(void) +unsigned long arch_mmap_rnd(void) { if (is_32bit_task()) return (get_random_int() & 0x7ff) << PAGE_SHIFT; @@ -183,7 +183,7 @@ unsigned long randomize_et_dyn(void) base &= ~((1UL << 32) - 1); if (current->flags & PF_RANDOMIZE) - base += mmap_rnd(); + base += arch_mmap_rnd(); return base; } @@ -199,7 +199,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) unsigned long random_factor = 0UL; if (current->flags & PF_RANDOMIZE) - random_factor = mmap_rnd(); + random_factor = arch_mmap_rnd(); /* * Fall back to the standard layout if the personality @@ -279,7 +279,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) unsigned long random_factor = 0UL; if (current->flags & PF_RANDOMIZE) - random_factor = mmap_rnd(); + random_factor = arch_mmap_rnd(); /* * Fall back to the standard layout if the personality diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c05d389..e8071d8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -86,6 +86,7 @@ config X86 select HAVE_ARCH_KMEMCHECK select HAVE_USER_RETURN_NOTIFIER select ARCH_BINFMT_ELF_RANDOMIZE_PIE + select ARCH_HAS_ELF_RANDOMIZE select HAVE_ARCH_JUMP_LABEL select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE select SPARSE_IRQ diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c index 0d9f14a..844b06d 100644 --- a/arch/x86/mm/mmap.c +++ b/arch/x86/mm/mmap.c @@ -65,7 +65,7 @@ static int mmap_is_legacy(void) return sysctl_legacy_va_layout; } -static unsigned long mmap_rnd(void) +unsigned long arch_mmap_rnd(void) { unsigned long rnd; @@ -114,7 +114,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) unsigned long random_factor = 0UL; if (current->flags & PF_RANDOMIZE) - random_factor = mmap_rnd(); + random_factor = arch_mmap_rnd(); mm->mmap_legacy_base = mmap_legacy_base(random_factor); diff --git a/include/linux/elf-randomize.h b/include/linux/elf-randomize.h new file mode 100644 index 0000000..7a4eda0 --- /dev/null +++ b/include/linux/elf-randomize.h @@ -0,0 +1,10 @@ +#ifndef _ELF_RANDOMIZE_H +#define _ELF_RANDOMIZE_H + +#ifndef CONFIG_ARCH_HAS_ELF_RANDOMIZE +static inline unsigned long arch_mmap_rnd(void) { return 0; } +#else +extern unsigned long arch_mmap_rnd(void); +#endif + +#endif