Patchwork Fix i386 memmove issue [BZ #22644]

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Submitter Andrew Senkevich
Date March 19, 2018, 5:52 p.m.
Message ID <CAMXFM3s39wwjHt=5PBp=Np8Rp=mXHfPwMq6_evtfx9MV08-mtQ@mail.gmail.com>
Download mbox | patch
Permalink /patch/26379/
State New
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Comments

Andrew Senkevich - March 19, 2018, 5:52 p.m.
2018-03-19 16:33 GMT+01:00 Florian Weimer <fweimer@redhat.com>:
> On 03/19/2018 03:25 PM, Szabolcs Nagy wrote:
>>
>> i thought not using MAP_FIXED is the 'non-overriding MAP_FIXED variant'

Hmm, I tried so and had got much bigger address. But now I see it
works (with size just 0x20000000 and 0x70000000 as a hint) in both 64
and 32 bit cases, so proposing the following:

Ok?


--
WBR,
Andrew
H.J. Lu - March 19, 2018, 5:57 p.m.
On Mon, Mar 19, 2018 at 10:52 AM, Andrew Senkevich
<andrew.n.senkevich@gmail.com> wrote:
> 2018-03-19 16:33 GMT+01:00 Florian Weimer <fweimer@redhat.com>:
>> On 03/19/2018 03:25 PM, Szabolcs Nagy wrote:
>>>
>>> i thought not using MAP_FIXED is the 'non-overriding MAP_FIXED variant'
>
> Hmm, I tried so and had got much bigger address. But now I see it
> works (with size just 0x20000000 and 0x70000000 as a hint) in both 64
> and 32 bit cases, so proposing the following:
>
> diff --git a/string/test-memmove.c b/string/test-memmove.c
> index edc7a4c..fa4037d 100644
> --- a/string/test-memmove.c
> +++ b/string/test-memmove.c
> @@ -24,6 +24,7 @@
>  # define TEST_NAME "memmove"
>  #endif
>  #include "test-string.h"
> +#include <support/test-driver.h>
>
>  char *simple_memmove (char *, const char *, size_t);
>
> @@ -245,6 +246,59 @@ do_random_tests (void)
>      }
>  }
>
> +static void
> +do_test2 (void)
> +{
> +  size_t size = 0x20000000;
> +  uint32_t * large_buf;
> +
> +  large_buf = mmap ((void*)0x70000000, size, PROT_READ | PROT_WRITE,
> +     MAP_PRIVATE | MAP_ANON, -1, 0);
> +
> +  if (large_buf == MAP_FAILED)
> +    error (EXIT_UNSUPPORTED, errno, "Large mmap failed");
> +
> +  if ((uintptr_t)large_buf > 0x80000000 - 128)

Don't you need to test if address is too low such that
0x80000000 - (uintptr_t)large_buf > 0x20000000?

> +    {
> +      error (0, 0,"Large mmap doesn't cross 0x80000000 boundary");
> +      ret = EXIT_UNSUPPORTED;
> +      munmap((void *)large_buf, size);
> +      return;
> +    }
> +
> +  uint32_t bytes_move = 0x80000000 - (uintptr_t)large_buf;
> +  uint32_t arr_size = bytes_move / sizeof(uint32_t);
> +  uint32_t i;

Please use size_t instead of uint32_t since 64-bit test is added now.

> +  FOR_EACH_IMPL (impl, 0)
> +    {
> +      for (i = 0; i < arr_size; i++)
> +        large_buf[i] = i;
> +
> +      uint32_t * dst = &large_buf[33];
> +
> +#ifdef TEST_BCOPY
> +      CALL (impl, (char *)large_buf, (char *)dst, bytes_move);
> +#else
> +      CALL (impl, (char *)dst, (char *)large_buf, bytes_move);
> +#endif
> +
> +      for (i = 0; i < arr_size; i++)
> +        {
> +          if (dst[i] != i)
> +     {
> +       error (0, 0,
> +      "Wrong result in function %s dst \"%p\" src \"%p\" offset \"%d\"",
> +      impl->name, dst, large_buf, i);
> +       ret = 1;
> +       break;
> +     }
> + }
> +    }
> +
> +  munmap((void *)large_buf, size);
> +}
> +
>  int
>  test_main (void)
>  {
> @@ -284,6 +338,9 @@ test_main (void)
>      }
>
>    do_random_tests ();
> +
> +  do_test2 ();
> +
>    return ret;
>  }
>
> Ok?
>
>
> --
> WBR,
> Andrew

Patch

diff --git a/string/test-memmove.c b/string/test-memmove.c
index edc7a4c..fa4037d 100644
--- a/string/test-memmove.c
+++ b/string/test-memmove.c
@@ -24,6 +24,7 @@ 
 # define TEST_NAME "memmove"
 #endif
 #include "test-string.h"
+#include <support/test-driver.h>

 char *simple_memmove (char *, const char *, size_t);

@@ -245,6 +246,59 @@  do_random_tests (void)
     }
 }

+static void
+do_test2 (void)
+{
+  size_t size = 0x20000000;
+  uint32_t * large_buf;
+
+  large_buf = mmap ((void*)0x70000000, size, PROT_READ | PROT_WRITE,
+     MAP_PRIVATE | MAP_ANON, -1, 0);
+
+  if (large_buf == MAP_FAILED)
+    error (EXIT_UNSUPPORTED, errno, "Large mmap failed");
+
+  if ((uintptr_t)large_buf > 0x80000000 - 128)
+    {
+      error (0, 0,"Large mmap doesn't cross 0x80000000 boundary");
+      ret = EXIT_UNSUPPORTED;
+      munmap((void *)large_buf, size);
+      return;
+    }
+
+  uint32_t bytes_move = 0x80000000 - (uintptr_t)large_buf;
+  uint32_t arr_size = bytes_move / sizeof(uint32_t);
+  uint32_t i;
+
+  FOR_EACH_IMPL (impl, 0)
+    {
+      for (i = 0; i < arr_size; i++)
+        large_buf[i] = i;
+
+      uint32_t * dst = &large_buf[33];
+
+#ifdef TEST_BCOPY
+      CALL (impl, (char *)large_buf, (char *)dst, bytes_move);
+#else
+      CALL (impl, (char *)dst, (char *)large_buf, bytes_move);
+#endif
+
+      for (i = 0; i < arr_size; i++)
+        {
+          if (dst[i] != i)
+     {
+       error (0, 0,
+      "Wrong result in function %s dst \"%p\" src \"%p\" offset \"%d\"",
+      impl->name, dst, large_buf, i);
+       ret = 1;
+       break;
+     }
+ }
+    }
+
+  munmap((void *)large_buf, size);
+}
+
 int
 test_main (void)
 {
@@ -284,6 +338,9 @@  test_main (void)
     }

   do_random_tests ();
+
+  do_test2 ();
+
   return ret;
 }