mirror of
https://github.com/torvalds/linux
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8463833590
When inspecting a vague code inside prctl(PR_SET_MM_MEM) call (which testing the RLIMIT_DATA value to figure out if we're allowed to assign new @start_brk, @brk, @start_data, @end_data from mm_struct) it's been commited that RLIMIT_DATA in a form it's implemented now doesn't do anything useful because most of user-space libraries use mmap() syscall for dynamic memory allocations. Linus suggested to convert RLIMIT_DATA rlimit into something suitable for anonymous memory accounting. But in this patch we go further, and the changes are bundled together as: * keep vma counting if CONFIG_PROC_FS=n, will be used for limits * replace mm->shared_vm with better defined mm->data_vm * account anonymous executable areas as executable * account file-backed growsdown/up areas as stack * drop struct file* argument from vm_stat_account * enforce RLIMIT_DATA for size of data areas This way code looks cleaner: now code/stack/data classification depends only on vm_flags state: VM_EXEC & ~VM_WRITE -> code (VmExe + VmLib in proc) VM_GROWSUP | VM_GROWSDOWN -> stack (VmStk) VM_WRITE & ~VM_SHARED & !stack -> data (VmData) The rest (VmSize - VmData - VmStk - VmExe - VmLib) could be called "shared", but that might be strange beast like readonly-private or VM_IO area. - RLIMIT_AS limits whole address space "VmSize" - RLIMIT_STACK limits stack "VmStk" (but each vma individually) - RLIMIT_DATA now limits "VmData" Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: Vegard Nossum <vegard.nossum@oracle.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Willy Tarreau <w@1wt.eu> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Kees Cook <keescook@google.com> Cc: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Pavel Emelyanov <xemul@virtuozzo.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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.. | ||
.gitignore | ||
acpi-ext.c | ||
acpi.c | ||
asm-offsets.c | ||
audit.c | ||
brl_emu.c | ||
crash.c | ||
crash_dump.c | ||
cyclone.c | ||
dma-mapping.c | ||
efi.c | ||
efi_stub.S | ||
elfcore.c | ||
entry.h | ||
entry.S | ||
err_inject.c | ||
esi.c | ||
esi_stub.S | ||
fsys.S | ||
fsyscall_gtod_data.h | ||
ftrace.c | ||
gate-data.S | ||
gate.lds.S | ||
gate.S | ||
head.S | ||
ia64_ksyms.c | ||
init_task.c | ||
iosapic.c | ||
irq.c | ||
irq_ia64.c | ||
irq_lsapic.c | ||
ivt.S | ||
jprobes.S | ||
kprobes.c | ||
machine_kexec.c | ||
machvec.c | ||
Makefile | ||
Makefile.gate | ||
mca.c | ||
mca_asm.S | ||
mca_drv.c | ||
mca_drv.h | ||
mca_drv_asm.S | ||
minstate.h | ||
module.c | ||
msi_ia64.c | ||
nr-irqs.c | ||
numa.c | ||
pal.S | ||
palinfo.c | ||
patch.c | ||
pci-dma.c | ||
pci-swiotlb.c | ||
perfmon.c | ||
perfmon_default_smpl.c | ||
perfmon_generic.h | ||
perfmon_itanium.h | ||
perfmon_mckinley.h | ||
perfmon_montecito.h | ||
process.c | ||
ptrace.c | ||
relocate_kernel.S | ||
sal.c | ||
salinfo.c | ||
setup.c | ||
sigframe.h | ||
signal.c | ||
smp.c | ||
smpboot.c | ||
stacktrace.c | ||
sys_ia64.c | ||
time.c | ||
topology.c | ||
traps.c | ||
unaligned.c | ||
uncached.c | ||
unwind.c | ||
unwind_decoder.c | ||
unwind_i.h | ||
vmlinux.lds.S |