• Andrey Ryabinin's avatar
    mm: vmalloc: pass additional vm_flags to __vmalloc_node_range() · cb9e3c29
    Andrey Ryabinin authored
    For instrumenting global variables KASan will shadow memory backing memory
    for modules.  So on module loading we will need to allocate memory for
    shadow and map it at address in shadow that corresponds to the address
    allocated in module_alloc().
    
    __vmalloc_node_range() could be used for this purpose, except it puts a
    guard hole after allocated area.  Guard hole in shadow memory should be a
    problem because at some future point we might need to have a shadow memory
    at address occupied by guard hole.  So we could fail to allocate shadow
    for module_alloc().
    
    Now we have VM_NO_GUARD flag disabling guard page, so we need to pass into
    __vmalloc_node_range().  Add new parameter 'vm_flags' to
    __vmalloc_node_range() function.
    Signed-off-by: default avatarAndrey Ryabinin <a.ryabinin@samsung.com>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    Cc: Konstantin Serebryany <kcc@google.com>
    Cc: Dmitry Chernenkov <dmitryc@google.com>
    Signed-off-by: default avatarAndrey Konovalov <adech.fo@gmail.com>
    Cc: Yuri Gribov <tetra2005@gmail.com>
    Cc: Konstantin Khlebnikov <koct9i@gmail.com>
    Cc: Sasha Levin <sasha.levin@oracle.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Andi Kleen <andi@firstfloor.org>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Pekka Enberg <penberg@kernel.org>
    Cc: David Rientjes <rientjes@google.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    cb9e3c29
vmalloc.h 5.83 KB