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Mike Frysinger 04e4f2b18c FDPIC: Respect PT_GNU_STACK exec protection markings when creating NOMMU stack ... The current code will load the stack size and protection markings, but then only use the markings in the MMU code path. The NOMMU code path always passes PROT_EXEC to the mmap() call. While this doesn't matter to most people whilst the code is running, it will cause a pointless icache flush when starting every FDPIC application. Typically this icache flush will be of a region on the order of 128KB in size, or may be the entire icache, depending on the facilities available on the CPU. In the case where the arch default behaviour seems to be desired (EXSTACK_DEFAULT), we probe VM_STACK_FLAGS for VM_EXEC to determine whether we should be setting PROT_EXEC or not. For arches that support an MPU (Memory Protection Unit - an MMU without the virtual mapping capability), setting PROT_EXEC or not will make an important difference. It should be noted that this change also affects the executability of the brk region, since ELF-FDPIC has that share with the stack. However, this is probably irrelevant as NOMMU programs aren't likely to use the brk region, preferring instead allocation via mmap(). Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		15 years ago
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Kbuild	…
asm-offsets.h	kbuild: move asm-offsets.h to include/generated	15 years ago
atomic.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
auxvec.h	…
bfin-global.h	Blackfin: support smaller uncached DMA chunks for memory constrained systems	15 years ago
bfin-lq035q1.h	fbdev: bfin-lq035q1-fb: new Blackfin Landscape LCD EZ-Extender driver	15 years ago
bfin5xx_spi.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
bfin_rotary.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
bfin_sdh.h	…
bfin_simple_timer.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
bfin_sport.h	…
bfrom.h	…
bitops.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
bitsperlong.h	…
blackfin.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
bug.h	Blackfin: Convert BUG() to use unreachable()	15 years ago
bugs.h	…
byteorder.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
cache.h	Blackfin: fix missed cache config renames	16 years ago
cacheflush.h	Blackfin: push down asm/ includes and out of bfin-global.h	15 years ago
cdef_LPBlackfin.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
checksum.h	Blackfin: convert to generic checksum code	15 years ago
clocks.h	Blackfin: pull in asm/dpmc.h for power defines	15 years ago
context.S	Blackfin: mass clean up of copyright/licensing info	16 years ago
cplb.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
cplbinit.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
cpu.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
cputime.h	…
current.h	…
def_LPBlackfin.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
delay.h	…
device.h	…
div64.h	…
dma-mapping.h	Blackfin: dma-mapping.h: flesh out missing DMA mapping functions	15 years ago
dma.h	Blackfin: dma-mapping.h: flesh out missing DMA mapping functions	15 years ago
dpmc.h	Blackfin: unify duplicated power masks	15 years ago
early_printk.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
elf.h	elf: kill USE_ELF_CORE_DUMP	15 years ago
emergency-restart.h	…
entry.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
errno.h	…
fb.h	…
fcntl.h	vfs: Implement proper O_SYNC semantics	15 years ago
fixed_code.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
flat.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
ftrace.h	…
futex.h	…
gpio.h	Blackfin: bf538: add support for extended GPIO banks	15 years ago
gptimers.h	Blackfin: gptimers: use unsigned timer/group ids	15 years ago
hardirq.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
hw_irq.h	…
io.h	Blackfin: io.h: fix random busted whitespace	15 years ago
ioctl.h	…
ioctls.h	…
ipcbuf.h	…
ipipe.h	Blackfin/ipipe: update version stamp	15 years ago
ipipe_base.h	Blackfin/ipipe: prepare status bitops for SMP support	15 years ago
irq.h	Blackfin: asm/irq.h: pull in mach/anomaly.h for anomaly defines	16 years ago
irq_handler.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
irq_regs.h	…
irqflags.h	Blackfin/ipipe: fix forward ref to barrier()	15 years ago
kdebug.h	…
kgdb.h	Blackfin: kgdb: punt dead code	15 years ago
kmap_types.h	…
l1layout.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
linkage.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
local.h	…
mem_init.h	Blackfin: punt dead/unused flash mem_init settings	15 years ago
mem_map.h	…
mman.h	…
mmu.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
mmu_context.h	Blackfin/ipipe: introduce support for CONFIG_MPU	15 years ago
module.h	module: make MODULE_SYMBOL_PREFIX into a CONFIG option	15 years ago
msgbuf.h	…
mutex.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
nand.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
page.h	FDPIC: Respect PT_GNU_STACK exec protection markings when creating NOMMU stack	15 years ago
page_offset.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
param.h	…
pci.h	Blackfin: convert to asm-generic pci headers	15 years ago
pda.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
percpu.h	…
pgalloc.h	…
pgtable.h	Blackfin: fix framebuffer mmap bug for nommu	16 years ago
poll.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
portmux.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
posix_types.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
processor.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
ptrace.h	Blackfin: comment the FDPIC PTRACE defines	15 years ago
reboot.h	…
resource.h	…
rwlock.h	…
scatterlist.h	…
sections.h	Blackfin: calculate on-chip lengths at link time rather than run time	15 years ago
segment.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
sembuf.h	…
serial.h	…
setup.h	…
shmbuf.h	…
shmparam.h	…
sigcontext.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
siginfo.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
signal.h	…
smp.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
socket.h	…
sockios.h	…
spinlock.h	locking: Convert raw_rwlock functions to arch_rwlock	15 years ago
spinlock_types.h	locking: Convert raw_rwlock to arch_rwlock	15 years ago
stat.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
statfs.h	…
string.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
swab.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
system.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
termbits.h	…
termios.h	…
thread_info.h	Blackfin: add support for TIF_NOTIFY_RESUME	15 years ago
time.h	…
timex.h	…
tlb.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
tlbflush.h	…
topology.h	…
trace.h	Blackfin: add C define of trace_buffer_init()	15 years ago
traps.h	Blackfin: mass clean up of copyright/licensing info	16 years ago
types.h	…
uaccess.h	Blackfin: push down asm/ includes and out of bfin-global.h	15 years ago
ucontext.h	…
unaligned.h	…
unistd.h	Blackfin: define __NR_recvmmsg	15 years ago
user.h	…
xor.h	…