kernel-ark/arch
Will Deacon 79d1f5c9ac ARM: 7641/1: memory: fix broken mmap by ensuring TASK_UNMAPPED_BASE is aligned
We have received multiple reports of mmap failures when running with a
2:2 vm split. These manifest as either -EINVAL with a non page-aligned
address (ending 0xaaa) or a SEGV, depending on the application. The
issue is commonly observed in children of make, which appears to use
bottom-up mmap (assumedly because it changes the stack rlimit).

Further investigation reveals that this regression was triggered by
394ef6403a ("mm: use vm_unmapped_area() on arm architecture"), whereby
TASK_UNMAPPED_BASE is no longer page-aligned for bottom-up mmap, causing
get_unmapped_area to choke on misaligned addressed.

This patch fixes the problem by defining TASK_UNMAPPED_BASE in terms of
TASK_SIZE and explicitly aligns the result to 16M, matching the other
end of the heap.

Acked-by: Nicolas Pitre <nico@linaro.org>
Reported-by: Steve Capper <steve.capper@arm.com>
Reported-by: Jean-Francois Moine <moinejf@free.fr>
Reported-by: Christoffer Dall <cdall@cs.columbia.edu>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-02-08 12:21:07 +00:00
..
alpha ALPHA: drivers: remove __dev* attributes. 2013-01-03 15:57:13 -08:00
arm ARM: 7641/1: memory: fix broken mmap by ensuring TASK_UNMAPPED_BASE is aligned 2013-02-08 12:21:07 +00:00
arm64 arm64: elf: fix core dumping to match what glibc expects 2013-01-22 17:50:59 +00:00
avr32 ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
blackfin ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
c6x These are a few cleanups for asm-generic: 2012-12-21 16:39:08 -08:00
cris ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
frv ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
h8300 These are a few cleanups for asm-generic: 2012-12-21 16:39:08 -08:00
hexagon Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-12-20 18:05:28 -08:00
ia64 ia64: kill thread_matches(), unexport ptrace_check_attach() 2013-01-20 12:26:05 -08:00
m32r ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
m68k Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k 2013-01-23 13:31:15 -08:00
microblaze Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze 2013-01-07 07:39:32 -08:00
mips Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2013-01-07 07:50:41 -08:00
mn10300 arch/mn10300/Kconfig: select CONFIG_GENERIC_ATOMIC64 2013-01-11 14:54:55 -08:00
openrisc ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
parisc parisc: sigaltstack doesn't round ss.ss_sp as required 2013-01-07 23:06:27 +01:00
powerpc KVM: PPC: Emulate dcbf 2013-01-18 00:40:49 +01:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2013-01-17 08:56:30 -08:00
score ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
sh sh: ecovec: add sample amixer settings 2013-01-16 18:30:44 +09:00
sparc sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
tile ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
um Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-12-20 18:05:28 -08:00
unicore32 ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
x86 perf/urgent fixes: 2013-01-22 14:32:07 -08:00
xtensa These are a few cleanups for asm-generic: 2012-12-21 16:39:08 -08:00
.gitignore
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-12-20 18:05:28 -08:00