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authorFlorian Weimer <fweimer@redhat.com>2017-11-13 17:55:12 +0100
committerFlorian Weimer <fweimer@redhat.com>2017-11-13 19:29:32 +0100
commitcae87e64dca14f50da7bbd99085c7f5e413ad0f8 (patch)
tree685bd105721f6f2f8ccc764f2a9a7569b70cdb63 /resolv
parenteceed67166ca9ee0587107baa394c7c3bc369813 (diff)
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support: Add <support/next_to_fault.h>
Based on the implementation in resolv/tst-inet_pton.c.
Diffstat (limited to 'resolv')
-rw-r--r--resolv/tst-inet_pton.c67
1 files changed, 11 insertions, 56 deletions
diff --git a/resolv/tst-inet_pton.c b/resolv/tst-inet_pton.c
index 4bb9f81193..5a06a802b3 100644
--- a/resolv/tst-inet_pton.c
+++ b/resolv/tst-inet_pton.c
@@ -22,57 +22,10 @@
#include <stdio.h>
#include <string.h>
#include <support/check.h>
+#include <support/next_to_fault.h>
#include <support/xunistd.h>
-#include <sys/mman.h>
-#include <sys/param.h>
#include <unistd.h>
-/* Memory region created by next_to_fault_allocate. */
-struct next_to_fault
-{
- /* The user data. */
- char *buffer;
- size_t length;
-
- /* The entire allocated region. */
- void *region_start;
- size_t region_size;
-};
-
-/* Allocate a buffer of SIZE bytes just before a page which is mapped
- with PROT_NONE (so that overrunning the buffer will cause a
- fault). */
-static struct next_to_fault
-next_to_fault_allocate (size_t size)
-{
- long page_size = sysconf (_SC_PAGE_SIZE);
- TEST_VERIFY_EXIT (page_size > 0);
- struct next_to_fault result;
- result.region_size = roundup (size, page_size) + page_size;
- TEST_VERIFY_EXIT (size + page_size > size);
- TEST_VERIFY_EXIT (result.region_size > size);
- result.region_start
- = xmmap (NULL, result.region_size, PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_ANONYMOUS, -1);
- /* Unmap the page after the allocation. */
- xmprotect (result.region_start + (result.region_size - page_size),
- page_size, PROT_NONE);
- /* Align the allocation within the region so that it ends just
- before the PROT_NONE page. */
- result.buffer = result.region_start + result.region_size - page_size - size;
- result.length = size;
- return result;
-}
-
-/* Deallocate the memory region allocated by
- next_to_fault_allocate. */
-static void
-next_to_fault_free (struct next_to_fault *ntf)
-{
- xmunmap (ntf->region_start, ntf->region_size);
- *ntf = (struct next_to_fault) { NULL, };
-}
-
struct test_case
{
/* The input data. */
@@ -139,12 +92,13 @@ run_one_test (const struct test_case *t)
{
size_t test_len = strlen (t->input);
- struct next_to_fault ntf_out4 = next_to_fault_allocate (4);
- struct next_to_fault ntf_out6 = next_to_fault_allocate (16);
+ struct support_next_to_fault ntf_out4 = support_next_to_fault_allocate (4);
+ struct support_next_to_fault ntf_out6 = support_next_to_fault_allocate (16);
/* inet_pton requires NUL termination. */
{
- struct next_to_fault ntf_in = next_to_fault_allocate (test_len + 1);
+ struct support_next_to_fault ntf_in
+ = support_next_to_fault_allocate (test_len + 1);
memcpy (ntf_in.buffer, t->input, test_len + 1);
memset (ntf_out4.buffer, 0, 4);
check_result ("inet_pton", t, AF_INET, ntf_out4.buffer,
@@ -152,12 +106,13 @@ run_one_test (const struct test_case *t)
memset (ntf_out6.buffer, 0, 16);
check_result ("inet_pton", t, AF_INET6, ntf_out6.buffer,
inet_pton (AF_INET6, ntf_in.buffer, ntf_out6.buffer));
- next_to_fault_free (&ntf_in);
+ support_next_to_fault_free (&ntf_in);
}
/* __inet_pton_length does not require NUL termination. */
{
- struct next_to_fault ntf_in = next_to_fault_allocate (test_len);
+ struct support_next_to_fault ntf_in
+ = support_next_to_fault_allocate (test_len);
memcpy (ntf_in.buffer, t->input, test_len);
memset (ntf_out4.buffer, 0, 4);
check_result ("__inet_pton_length", t, AF_INET, ntf_out4.buffer,
@@ -167,11 +122,11 @@ run_one_test (const struct test_case *t)
check_result ("__inet_pton_length", t, AF_INET6, ntf_out6.buffer,
__inet_pton_length (AF_INET6, ntf_in.buffer, ntf_in.length,
ntf_out6.buffer));
- next_to_fault_free (&ntf_in);
+ support_next_to_fault_free (&ntf_in);
}
- next_to_fault_free (&ntf_out4);
- next_to_fault_free (&ntf_out6);
+ support_next_to_fault_free (&ntf_out4);
+ support_next_to_fault_free (&ntf_out6);
}
/* The test cases were manually crafted and the set enhanced with