accb61fe7b
Since we no longer need the VM_ALWAYSDUMP flag, let's use the freed bit for 'VM_NODUMP' flag. The idea is is to add a new madvise() flag: MADV_DONTDUMP, which can be set by applications to specifically request memory regions which should not dump core. The specific application I have in mind is qemu: we can add a flag there that wouldn't dump all of guest memory when qemu dumps core. This flag might also be useful for security sensitive apps that want to absolutely make sure that parts of memory are not dumped. To clear the flag use: MADV_DODUMP. [akpm@linux-foundation.org: s/MADV_NODUMP/MADV_DONTDUMP/, s/MADV_CLEAR_NODUMP/MADV_DODUMP/, per Roland] [akpm@linux-foundation.org: fix up the architectures which broke] Signed-off-by: Jason Baron <jbaron@redhat.com> Acked-by: Roland McGrath <roland@hack.frob.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Avi Kivity <avi@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
67 lines
2.8 KiB
C
67 lines
2.8 KiB
C
#ifndef __ALPHA_MMAN_H__
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#define __ALPHA_MMAN_H__
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#define PROT_READ 0x1 /* page can be read */
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#define PROT_WRITE 0x2 /* page can be written */
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#define PROT_EXEC 0x4 /* page can be executed */
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#define PROT_SEM 0x8 /* page may be used for atomic ops */
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#define PROT_NONE 0x0 /* page can not be accessed */
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#define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */
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#define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */
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#define MAP_SHARED 0x01 /* Share changes */
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#define MAP_PRIVATE 0x02 /* Changes are private */
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#define MAP_TYPE 0x0f /* Mask for type of mapping (OSF/1 is _wrong_) */
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#define MAP_FIXED 0x100 /* Interpret addr exactly */
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#define MAP_ANONYMOUS 0x10 /* don't use a file */
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/* not used by linux, but here to make sure we don't clash with OSF/1 defines */
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#define _MAP_HASSEMAPHORE 0x0200
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#define _MAP_INHERIT 0x0400
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#define _MAP_UNALIGNED 0x0800
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/* These are linux-specific */
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#define MAP_GROWSDOWN 0x01000 /* stack-like segment */
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#define MAP_DENYWRITE 0x02000 /* ETXTBSY */
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#define MAP_EXECUTABLE 0x04000 /* mark it as an executable */
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#define MAP_LOCKED 0x08000 /* lock the mapping */
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#define MAP_NORESERVE 0x10000 /* don't check for reservations */
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#define MAP_POPULATE 0x20000 /* populate (prefault) pagetables */
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#define MAP_NONBLOCK 0x40000 /* do not block on IO */
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#define MAP_STACK 0x80000 /* give out an address that is best suited for process/thread stacks */
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#define MAP_HUGETLB 0x100000 /* create a huge page mapping */
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#define MS_ASYNC 1 /* sync memory asynchronously */
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#define MS_SYNC 2 /* synchronous memory sync */
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#define MS_INVALIDATE 4 /* invalidate the caches */
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#define MCL_CURRENT 8192 /* lock all currently mapped pages */
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#define MCL_FUTURE 16384 /* lock all additions to address space */
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#define MADV_NORMAL 0 /* no further special treatment */
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#define MADV_RANDOM 1 /* expect random page references */
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#define MADV_SEQUENTIAL 2 /* expect sequential page references */
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#define MADV_WILLNEED 3 /* will need these pages */
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#define MADV_SPACEAVAIL 5 /* ensure resources are available */
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#define MADV_DONTNEED 6 /* don't need these pages */
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/* common/generic parameters */
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#define MADV_REMOVE 9 /* remove these pages & resources */
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#define MADV_DONTFORK 10 /* don't inherit across fork */
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#define MADV_DOFORK 11 /* do inherit across fork */
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#define MADV_MERGEABLE 12 /* KSM may merge identical pages */
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#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */
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#define MADV_HUGEPAGE 14 /* Worth backing with hugepages */
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#define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */
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#define MADV_DONTDUMP 16 /* Explicity exclude from the core dump,
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overrides the coredump filter bits */
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#define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */
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/* compatibility flags */
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#define MAP_FILE 0
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#endif /* __ALPHA_MMAN_H__ */
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