From: Andrew Senkevich <andrew.n.senkevich@gmail.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Florian Weimer <fweimer@redhat.com>,
Szabolcs Nagy <szabolcs.nagy@arm.com>,
Andreas Schwab <schwab@suse.de>, nd <nd@arm.com>,
libc-alpha <libc-alpha@sourceware.org>, Max Horn <max@quendi.de>,
thomas@grindinggear.com
Subject: Re: [PATCH] Fix i386 memmove issue [BZ #22644]
Date: Mon, 19 Mar 2018 19:30:00 -0000 [thread overview]
Message-ID: <CAMXFM3vWVVbe0unZaueF+u62KJ-Sxa6ttMdZRaf_UesxMU=ZKA@mail.gmail.com> (raw)
In-Reply-To: <CAMe9rOoCe+qiOFK8=dwxm+eB=_wSoHbXdid0RKSUHqOtM7Wwfg@mail.gmail.com>
2018-03-19 18:57 GMT+01:00 H.J. Lu <hjl.tools@gmail.com>:
> 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?
Indeed, thanks. Updated below.
diff --git a/string/test-memmove.c b/string/test-memmove.c
index edc7a4c..9f1437d 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 +246,60 @@ 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
+ || 0x80000000 - (uintptr_t)large_buf > 0x20000000)
+ {
+ error (0, 0,"Large mmap allocated improperly");
+ ret = EXIT_UNSUPPORTED;
+ munmap((void *)large_buf, size);
+ return;
+ }
+
+ size_t bytes_move = 0x80000000 - (uintptr_t)large_buf;
+ size_t arr_size = bytes_move / sizeof(uint32_t);
+ size_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 +339,9 @@ test_main (void)
}
do_random_tests ();
+
+ do_test2 ();
+
return ret;
}
--
WBR,
Andrew
next prev parent reply other threads:[~2018-03-19 19:30 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-19 10:13 Andrew Senkevich
2018-02-19 10:31 ` Andreas Schwab
2018-03-14 14:43 ` Andrew Senkevich
2018-03-14 14:59 ` H.J. Lu
2018-03-19 12:46 ` Andrew Senkevich
2018-03-19 12:55 ` H.J. Lu
2018-03-19 13:11 ` Andreas Schwab
2018-03-19 13:17 ` Florian Weimer
2018-03-19 14:01 ` Andrew Senkevich
2018-03-19 14:25 ` Szabolcs Nagy
2018-03-19 15:33 ` Florian Weimer
2018-03-19 17:52 ` Andrew Senkevich
2018-03-19 17:57 ` H.J. Lu
2018-03-19 19:30 ` Andrew Senkevich [this message]
2018-03-19 19:38 ` H.J. Lu
2018-03-19 20:33 ` Andrew Senkevich
2018-03-19 20:50 ` H.J. Lu
2018-03-20 8:58 ` Andreas Schwab
2018-03-23 17:15 ` Andrew Senkevich
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