package/libcap/0003-libcap-cap_file.c-fix-build-with-old-kernel-headers.patch

   1 From ace694e9574eb38e07cfe0db235434eb40003f47 Mon Sep 17 00:00:00 2001
   2 From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   3 Date: Mon, 14 Mar 2016 22:39:15 +0100
   4 Subject: [PATCH] libcap/cap_file.c: fix build with old kernel headers
   5
   6 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   7 ---
   8  libcap/cap_file.c | 27 +++++++++++++++++++++++++++
   9  1 file changed, 27 insertions(+)
  10
  11 diff --git a/libcap/cap_file.c b/libcap/cap_file.c
  12 index 40756ea..e3d54dd 100644
  13 --- a/libcap/cap_file.c
  14 +++ b/libcap/cap_file.c
  15 @@ -23,6 +23,33 @@ extern int fsetxattr(int, const char *, const void *, size_t, int);
  16  extern int removexattr(const char *, const char *);
  17  extern int fremovexattr(int, const char *);
  18
  19 +
  20 +/*
  21 + * Old kernels (before 2.6.36) were defining XATTR_NAME_CAPS in
  22 + * <linux/capability.h>, but using XATTR_SECURITY_PREFIX and
  23 + * XATTR_CAPS_SUFFIX which were defined in the kernel-only part of
  24 + * <linux/xattr.h>.
  25 + *
  26 + * In kernel 2.6.36 (commit af4f136056c984b0aa67feed7d3170b958370b2f),
  27 + * the XATTR_NAME_CAPS definition was moved to the kernel-only part of
  28 + * <linux/xattr.h>. It's only in kernel 3.0 (commit
  29 + * 1dbe39424a43e56a6c9aed12661192af51dcdb9f) that <linux/xattr.h> was
  30 + * fixed to expose XATTR_NAME_CAPS and the related definitions to
  31 + * userspace.
  32 + *
  33 + * In order to cope with kernels < 3.0, we define here the appropriate
  34 + * values, which we assume haven't changed over history.
  35 + */
  36 +#ifndef XATTR_CAPS_SUFFIX
  37 +#define XATTR_CAPS_SUFFIX "capability"
  38 +#endif
  39 +#ifndef XATTR_SECURITY_PREFIX
  40 +#define XATTR_SECURITY_PREFIX "security."
  41 +#endif
  42 +#ifndef XATTR_NAME_CAPS
  43 +#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
  44 +#endif
  45 +
  46  #include "libcap.h"
  47
  48  #ifdef VFS_CAP_U32
  49 --
  50 2.6.4
  51