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From: Дмитрий Д. <di...@gm...> - 2010-11-11 12:55:40
|
Ah, i find err. I add patch for strncasecmp, while i need patch for strcasecmp :) Now work fine. REDIR: 0x33d6286790 (strcasecmp) redirected to 0x48015ca (_vgnU_ifunc_wrapper) REDIR: 0x33d63258d0 (__strcasecmp_sse42) redirected to 0x4a06d00 (strcasecmp) PR https://bugs.kde.org/show_bug.cgi?id=256600 with patch for strcasecmp and strncasecmp. Thank You, Dmitry 2010/11/11 Tom Hughes <to...@co...>: > On 11/11/10 12:03, Дмитрий Дьяченко wrote: > >> after adding naive implementation (dup code for strncmp) >> >> valgrind --tool=memcheck -v -v ... >> ... >> --17868-- REDIR: 0x33d6288a50 (strncasecmp) redirected to 0x48015ca >> (_vgnU_ifunc_wrapper) >> ==17868== Invalid read of size 8 >> ==17868== at 0x33D6325925: __strcasecmp_l_sse42 (strcmp.S:259) >> >> I.e. >> - strncasecmp redir to _vgnU_ifunc_wrapper >> - no more redirs happen >> >> Look as i miss smth trivial. Please, can You point me to a right direction? > > Ah ok, if you can use tolower() then it's fine. I was forgetting that > the code would be running in the context of the client and hence would > have access to libc routines. > > Please open a bug and attach your patch. > > Tom > > -- > Tom Hughes (to...@co...) > http://compton.nu/ > |
|
From: Tom H. <to...@co...> - 2010-11-11 12:10:51
|
On 11/11/10 12:03, Дмитрий Дьяченко wrote: > after adding naive implementation (dup code for strncmp) > > valgrind --tool=memcheck -v -v ... > ... > --17868-- REDIR: 0x33d6288a50 (strncasecmp) redirected to 0x48015ca > (_vgnU_ifunc_wrapper) > ==17868== Invalid read of size 8 > ==17868== at 0x33D6325925: __strcasecmp_l_sse42 (strcmp.S:259) > > I.e. > - strncasecmp redir to _vgnU_ifunc_wrapper > - no more redirs happen > > Look as i miss smth trivial. Please, can You point me to a right direction? Ah ok, if you can use tolower() then it's fine. I was forgetting that the code would be running in the context of the client and hence would have access to libc routines. Please open a bug and attach your patch. Tom -- Tom Hughes (to...@co...) http://compton.nu/ |
|
From: Дмитрий Д. <di...@gm...> - 2010-11-11 12:04:40
|
Hello, Tom
after adding naive implementation (dup code for strncmp)
valgrind --tool=memcheck -v -v ...
...
--17868-- REDIR: 0x33d6288a50 (strncasecmp) redirected to 0x48015ca
(_vgnU_ifunc_wrapper)
==17868== Invalid read of size 8
==17868== at 0x33D6325925: __strcasecmp_l_sse42 (strcmp.S:259)
I.e.
- strncasecmp redir to _vgnU_ifunc_wrapper
- no more redirs happen
Look as i miss smth trivial. Please, can You point me to a right direction?
for example, redirs for strncmp look as
- REDIR: 0x33d6282f80 (__GI_strncmp) redirected to 0x4a06c10 (__GI_strncmp)
- REDIR: 0x33d6282f40 (strncmp) redirected to 0x48015ca (_vgnU_ifunc_wrapper)
- REDIR: 0x33d6323ee0 (__strncmp_sse42) redirected to 0x4a06ba0 (strncmp)
Thank You,
Dmitry
Index: memcheck/mc_replace_strmem.c
===================================================================
--- memcheck/mc_replace_strmem.c (revision 11477)
+++ memcheck/mc_replace_strmem.c (working copy)
@@ -402,7 +402,34 @@
STRNCMP(VG_Z_DYLD, strncmp)
#endif
+#define STRNCASECMP(soname, fnname) \
+ int VG_REPLACE_FUNCTION_ZU(soname,fnname) \
+ ( const char* s1, const char* s2, SizeT nmax ); \
+ int VG_REPLACE_FUNCTION_ZU(soname,fnname) \
+ ( const char* s1, const char* s2, SizeT nmax ) \
+ { \
+ SizeT n = 0; \
+ while (True) { \
+ if (n >= nmax) return 0; \
+ if (*s1 == 0 && *s2 == 0) return 0; \
+ if (*s1 == 0) return -1; \
+ if (*s2 == 0) return 1; \
+ \
+ if (tolower(*(unsigned char*)s1) < tolower(*(unsigned
char*)s2)) return -1; \
+ if (tolower(*(unsigned char*)s1) > tolower(*(unsigned
char*)s2)) return 1; \
+ \
+ s1++; s2++; n++; \
+ } \
+ }
+STRNCASECMP(VG_Z_LIBC_SONAME, strncasecmp)
+#if defined(VGO_linux)
+STRNCASECMP(VG_Z_LIBC_SONAME, __GI_strncasecmp)
+#elif defined(VGO_darwin)
+STRNCASECMP(VG_Z_DYLD, strncasecmp)
+#endif
2010/11/10 Tom Hughes <to...@co...>:
> On 10/11/10 15:37, Дмитрий Дьяченко wrote:
>
>> With gcc-4.5.1/Fedora14/x64 i got messages from valgrind-trunk/memcheck
>>
>> ==23300== Use of uninitialised value of size 8
>> ==23300== at 0x33D63277E4: __strncasecmp_l_sse42 (strcmp.S:402)
>>
>> memcheck/mc_replace_strmem.c contains no strncasecmp() function.
>>
>> Is there any special reason?
>> Or strncasecmp() may be added into mc_replace_strmem.c?
>
> Yes I saw that as well, and yes it probably does need adding to the
> replaced routines but it's hard because it will need to know how to do
> case folding, which is locale dependent.
>
> Tom
>
> --
> Tom Hughes (to...@co...)
> http://compton.nu/
>
|