diff options
Diffstat (limited to 'config/kernel-kmem-cache.m4')
| -rw-r--r-- | config/kernel-kmem-cache.m4 | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/config/kernel-kmem-cache.m4 b/config/kernel-kmem-cache.m4 new file mode 100644 index 000000000..50a7fdb4b --- /dev/null +++ b/config/kernel-kmem-cache.m4 @@ -0,0 +1,72 @@ +dnl # +dnl # 2.6.35 API change, +dnl # The cachep->gfpflags member was renamed cachep->allocflags. These are +dnl # private allocation flags which are applied when allocating a new slab +dnl # in kmem_getpages(). Unfortunately there is no public API for setting +dnl # non-default flags. +dnl # +AC_DEFUN([SPL_AC_KMEM_CACHE_ALLOCFLAGS], [ + AC_MSG_CHECKING([whether struct kmem_cache has allocflags]) + SPL_LINUX_TRY_COMPILE([ + #include <linux/slab.h> + ],[ + struct kmem_cache cachep __attribute__ ((unused)); + cachep.allocflags = GFP_KERNEL; + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_KMEM_CACHE_ALLOCFLAGS, 1, + [struct kmem_cache has allocflags]) + ],[ + AC_MSG_RESULT(no) + + AC_MSG_CHECKING([whether struct kmem_cache has gfpflags]) + SPL_LINUX_TRY_COMPILE([ + #include <linux/slab.h> + ],[ + struct kmem_cache cachep __attribute__ ((unused)); + cachep.gfpflags = GFP_KERNEL; + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_KMEM_CACHE_GFPFLAGS, 1, + [struct kmem_cache has gfpflags]) + ],[ + AC_MSG_RESULT(no) + ]) + ]) +]) + +dnl # +dnl # grsecurity API change, +dnl # kmem_cache_create() with SLAB_USERCOPY flag replaced by +dnl # kmem_cache_create_usercopy(). +dnl # +AC_DEFUN([SPL_AC_KMEM_CACHE_CREATE_USERCOPY], [ + AC_MSG_CHECKING([whether kmem_cache_create_usercopy() exists]) + tmp_flags="$EXTRA_KCFLAGS" + EXTRA_KCFLAGS="-Werror" + SPL_LINUX_TRY_COMPILE([ + #include <linux/slab.h> + static void ctor(void *foo) + { + // fake ctor + } + ],[ + struct kmem_cache *skc_linux_cache; + const char *name = "test"; + size_t size = 4096; + size_t align = 8; + unsigned long flags = 0; + size_t useroffset = 0; + size_t usersize = size - useroffset; + + skc_linux_cache = kmem_cache_create_usercopy( + name, size, align, flags, useroffset, usersize, ctor); + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_KMEM_CACHE_CREATE_USERCOPY, 1, + [kmem_cache_create_usercopy() exists]) + ],[ + AC_MSG_RESULT(no) + ]) + EXTRA_KCFLAGS="$tmp_flags" +]) |