From: Otto Moerbeek <[email protected]>
Date: Tue, 17 Oct 2023 07:52:12 +0200

> On Tue, Oct 17, 2023 at 07:33:47AM +0900, Masato Asou wrote:
> 
>> From: Masato Asou <[email protected]>
>> Date: Fri, 29 Sep 2023 19:39:12 +0900 (JST)
>> 
>> ping
> 
> Sorry for not replying earlier.

No problem :-)

> The locations are reported
> correctly now. But there are spurious reports of accesses of a 8 byte
> value on each system call. (tested on amd64).
> 
>       -Otto
> 
> ==83949== Use of uninitialised value of size 8
> ==83949==    at 0x4A0CEC2: write (sys/w_write.c:28)
> ==83949==    by 0x4A1B322: __sflush (stdio/fflush.c:80)
> ==83949==    by 0x49B21E8: __sfvwrite (stdio/fvwrite.c:188)
> ==83949==    by 0x4A26FED: __sprint (stdio/vfprintf.c:108)
> ==83949==    by 0x4A26FED: __vfprintf (stdio/vfprintf.c:1062)
> ==83949==    by 0x4A23CA5: vfprintf (stdio/vfprintf.c:263)
> ==83949==    by 0x49EDB54: printf (stdio/printf.c:44)
> ==83949==    by 0x109B90: main (m.c:16)

I know this issue.  This is due to the references to the FS (F
segment) registers TCB and TIB made by ENTER_CANCEL_POINT and
LEAVE_CANCEL_POINT during the system call invocation.

I think this problem should be solved in the `.supp' files (valgrind
--suppressions=<filename>).  I am working on a `.supp' file for
OpenBSD.  However, this cannot be created quickly yet.  Wouldn't it be
better to commit the `.supp' file as a separate modification?
--
ASOU Masato

>> 
>> > I have fixed the bug you reported when symbols were not printed.
>> > 
>> > As shown below, if the lower 12 bits of Virtual Address are 0 and File
>> > Size is 0, then the a.out symbol will not be printed.
>> > 
>> > $ readelf -l a.out
>> > </snip>
>> > Program Headers:
>> >   Type           Offset             VirtAddr           PhysAddr
>> >                  FileSiz            MemSiz              Flags  Align
>> > </snip>
>> >   LOAD           0x0000000000001000 0x0000000000003000 0x0000000000003000
>> >                  0x0000000000000000 0x0000000000000055  RW     1000
>> > 
>> > From: Otto Moerbeek <[email protected]>
>> > Date: Tue, 5 Sep 2023 07:40:18 +0200
>> > 
>> >> On Tue, Sep 05, 2023 at 09:38:40AM +0900, Masato Asou wrote:
>> >> 
>> >>> hi,
>> >>> 
>> >>> I have fixed a bug in Valgrind. The Valgrind could not detect access
>> >>> outside the range of malloc.
>> >>> 
>> >>> comments, ok?
>> >> 
>> >> This works much better that before. Thanks for working on this!
>> >> 
>> >> It now detects out of bounds read and writes correctly. A double
>> >> free is detected.
>> >> Also, the spurious reports for accesses to errno are gone.
>> >> 
>> >> It does not report proper locations though, even if I compile my test
>> >> program with -g:
>> >> 
>> >> ==23912== Invalid read of size 1
>> >> ==23912==    at 0x109B5D: ??? (in ./a.out)
>> >> ==23912==    by 0x1098D1: ??? (in ./a.out)
>> >> ==23912==  Address 0x4a42840 is 0 bytes after a block of size 10,240 
>> >> alloc'd
>> >> ==23912==    at 0x493A3A9: malloc (vg_replace_malloc.c:435)
>> >> ==23912==    by 0x109B32: ??? (in ./a.out)
>> >> ==23912==    by 0x1098D1: ??? (in ./a.out)
>> >> ==23912== 
>> >> 0
>> > 
>> > The a.out symbol is now printed as shown below:
>> > 
>> > $ cat malloctest.c
>> > #include <stdlib.h>
>> > #include <stdio.h>
>> > 
>> > int
>> > main(int argc, char *argv[])
>> > {
>> >    size_t sz = atoi(argv[1]);
>> >    unsigned char *p = malloc(sz);
>> >    printf("%p\n", p);
>> >    p[sz] = 0;
>> >    printf("%x\n", p[sz]);
>> >    free(p);
>> >    free(p);
>> >    return 0;
>> > }
>> > $ cc -g malloctest.c 
>> > $ valgrind ./a.out 128
>> > ==21074== Memcheck, a memory error detector
>> > ==21074== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
>> > ==21074== Using Valgrind-3.21.0 and LibVEX; rerun with -h for copyright 
>> > info
>> > ==21074== Command: ./a.out 128
>> > ==21074== 
>> > ==21074== Use of uninitialised value of size 8
>> > ==21074==    at 0x49C34CD: write (sys/w_write.c:26)
>> > ==21074==    by 0x4A150D2: __sflush (stdio/fflush.c:80)
>> > ==21074==    by 0x49B99C8: __sfvwrite (stdio/fvwrite.c:191)
>> > ==21074==    by 0x4979E4D: __sprint (stdio/vfprintf.c:108)
>> > ==21074==    by 0x4979E4D: __vfprintf (stdio/vfprintf.c:1064)
>> > ==21074==    by 0x4976B05: vfprintf (stdio/vfprintf.c:263)
>> > ==21074==    by 0x49D6434: printf (stdio/printf.c:44)
>> > ==21074==    by 0x109B48: main (malloctest.c:9)
>> > ==21074== 
>> > ==21074== Use of uninitialised value of size 8
>> > ==21074==    at 0x49C34DE: write (sys/w_write.c:26)
>> > ==21074==    by 0x4A150D2: __sflush (stdio/fflush.c:80)
>> > ==21074==    by 0x49B99C8: __sfvwrite (stdio/fvwrite.c:191)
>> > ==21074==    by 0x4979E4D: __sprint (stdio/vfprintf.c:108)
>> > ==21074==    by 0x4979E4D: __vfprintf (stdio/vfprintf.c:1064)
>> > ==21074==    by 0x4976B05: vfprintf (stdio/vfprintf.c:263)
>> > ==21074==    by 0x49D6434: printf (stdio/printf.c:44)
>> > ==21074==    by 0x109B48: main (malloctest.c:9)
>> > 
>> >> ==23912== Invalid free() / delete / delete[] / realloc()
>> >> ==23912==    at 0x493C981: free (vg_replace_malloc.c:978)
>> >> ==23912==    by 0x109B80: ??? (in ./a.out)
>> >> ==23912==    by 0x1098D1: ??? (in ./a.out)
>> >> ==23912==  Address 0x4a40040 is 0 bytes inside a block of size 10,240 
>> >> free'd
>> >> ==23912==    at 0x493C981: free (vg_replace_malloc.c:978)
>> >> ==23912==    by 0x109B77: ??? (in ./a.out)
>> >> ==23912==    by 0x1098D1: ??? (in ./a.out)
>> >> ==23912==  Block was alloc'd at
>> >> ==23912==    at 0x493A3A9: malloc (vg_replace_malloc.c:435)
>> >> ==23912==    by 0x109B32: ??? (in ./a.out)
>> >> ==23912==    by 0x1098D1: ??? (in ./a.out)
>> >> 
>> >> addr2line -e ./a.out 0x109B80 also does not succeed in translating the 
>> >> address.
>> > 
>> > Address reported by Valgrind cannot be used for addr2line.  Because
>> > the address is the address of the area where Valgrind mapped a.out
>> > with mmap().
>> > 
>> > 
>> > The Makefile and patch-coregrind_m_replacemalloc_vg_replace_malloc_c
>> > in the following diff are the same as the first reported diff.
>> > 
>> > ok, comments?
>> > --
>> > ASOU Masato
>> > 
>> > Index: devel/valgrind/Makefile
>> > ===================================================================
>> > RCS file: /cvs/ports/devel/valgrind/Makefile,v
>> > retrieving revision 1.32
>> > diff -u -p -r1.32 Makefile
>> > --- devel/valgrind/Makefile        21 Sep 2023 09:50:07 -0000      1.32
>> > +++ devel/valgrind/Makefile        29 Sep 2023 09:44:46 -0000
>> > @@ -5,7 +5,7 @@ CATEGORIES =               devel
>> >  
>> >  V =                       3.21.0
>> >  DISTNAME =                valgrind-${V}
>> > -REVISION =                0
>> > +REVISION =                1
>> >  EXTRACT_SUFX =            .tar.bz2
>> >  
>> >  SITES =                   https://sourceware.org/pub/valgrind/
>> > Index: devel/valgrind/patches/patch-coregrind_m_aspacemgr_aspacemgr_linux_c
>> > ===================================================================
>> > RCS file: 
>> > /cvs/ports/devel/valgrind/patches/patch-coregrind_m_aspacemgr_aspacemgr_linux_c,v
>> > retrieving revision 1.1
>> > diff -u -p -r1.1 patch-coregrind_m_aspacemgr_aspacemgr_linux_c
>> > --- devel/valgrind/patches/patch-coregrind_m_aspacemgr_aspacemgr_linux_c   
>> > 18 Jul 2023 06:17:15 -0000      1.1
>> > +++ devel/valgrind/patches/patch-coregrind_m_aspacemgr_aspacemgr_linux_c   
>> > 29 Sep 2023 09:44:46 -0000
>> > @@ -18,7 +18,41 @@
>> >      = (Addr) 0x04000000; // 64M
>> >   #else
>> >   #endif
>> > -@@ -1550,7 +1550,7 @@
>> > +@@ -685,6 +685,7 @@
>> > +          break;
>> > + 
>> > +       case SkFileC: case SkFileV:
>> > ++#if !defined(VGO_openbsd)
>> > +          if (s1->hasR == s2->hasR 
>> > +              && s1->hasW == s2->hasW && s1->hasX == s2->hasX
>> > +              && s1->dev == s2->dev && s1->ino == s2->ino
>> > +@@ -695,6 +696,25 @@
>> > +             ML_(am_dec_refcount)(s1->fnIdx);
>> > +             return True;
>> > +          }
>> > ++         // The following is an excerpt from `readelf -l a.out'.
>> > ++         //
>> > ++         // LOAD    0x0000000000000e20 0x0000000000002e20 
>> > 0x0000000000002e20
>> > ++         //         0x00000000000001e0 0x00000000000001e0  RW     1000
>> > ++         // LOAD    0x0000000000001000 0x0000000000003000 
>> > 0x0000000000003000
>> > ++         //         0x0000000000000000 0x0000000000000055  RW     1000
>> > ++         //
>> > ++         // The above two areas are determined to be contiguous area in 
>> > the
>> > ++         // above `if' statement, and they are merged by 
>> > preen_nsegments().
>> > ++         // Then, di->fsm.rw_map_count in the following `if' statement in
>> > ++         // VG_(di_notify_mmap)() would be 1, which does not match
>> > ++         // rw_load_count, and di_notify_ACHIEVE_ACCEPT_STATE() is not 
>> > called.
>> > ++         // In the above program header, rw_load_count is 2.
>> > ++         //
>> > ++         //   if (di->fsm.have_rx_map &&
>> > ++         //       rw_load_count >= 1 &&
>> > ++         //       di->fsm.rw_map_count == rw_load_count) {
>> > ++         //      return di_notify_ACHIEVE_ACCEPT_STATE ( di );
>> > ++#endif
>> > +          break;
>> > + 
>> > +       case SkShmC:
>> > +@@ -1550,7 +1570,7 @@
>> >      if (filename || (dev != 0 && ino != 0)) 
>> >         seg.kind = SkFileV;
>> >   
>> > @@ -27,7 +61,7 @@
>> >      // GrP fixme no dev/ino on darwin
>> >      if (offset != 0) 
>> >         seg.kind = SkFileV;
>> > -@@ -2697,7 +2697,11 @@
>> > +@@ -2697,7 +2717,11 @@
>> >         a client request to call the outer VG_(am_get_advisory). */
>> >      sres = VG_(am_do_mmap_NO_NOTIFY)( 
>> >                advised, length, 
>> > @@ -39,7 +73,7 @@
>> >                VKI_MAP_FIXED|VKI_MAP_PRIVATE|VKI_MAP_ANONYMOUS, 
>> >                VM_TAG_VALGRIND, 0
>> >             );
>> > -@@ -2742,6 +2746,54 @@
>> > +@@ -2742,6 +2766,54 @@
>> >      return sres;
>> >   }
>> >   
>> > @@ -94,7 +128,7 @@
>> >   /* Really just a wrapper around VG_(am_mmap_anon_float_valgrind). */
>> >   
>> >   SysRes VG_(am_shadow_alloc)(SizeT size)
>> > -@@ -3896,10 +3948,14 @@
>> > +@@ -3896,10 +3968,14 @@
>> >   /*------END-procmaps-parser-for-Darwin---------------------------*/
>> >   
>> >   /*------BEGIN-procmaps-parser-for-Freebsd------------------------*/
>> > @@ -111,7 +145,7 @@
>> >   
>> >   /* static ... to keep it out of the stack frame. */
>> >   static char procmap_buf[M_PROCMAP_BUF];
>> > -@@ -3911,6 +3967,7 @@
>> > +@@ -3911,6 +3987,7 @@
>> >         void (*record_gap)( Addr addr, SizeT len )
>> >      )
>> >   {
>> > @@ -119,7 +153,7 @@
>> >       Addr   start, endPlusOne, gapStart;
>> >       char* filename;
>> >       char   *p;
>> > -@@ -3968,6 +4025,57 @@
>> > +@@ -3968,6 +4045,57 @@
>> >    
>> >       if (record_gap && gapStart < Addr_MAX)
>> >          (*record_gap) ( gapStart, Addr_MAX - gapStart + 1 );
>> > Index: 
>> > devel/valgrind/patches/patch-coregrind_m_replacemalloc_vg_replace_malloc_c
>> > ===================================================================
>> > RCS file: 
>> > devel/valgrind/patches/patch-coregrind_m_replacemalloc_vg_replace_malloc_c
>> > diff -N 
>> > devel/valgrind/patches/patch-coregrind_m_replacemalloc_vg_replace_malloc_c
>> > --- /dev/null      1 Jan 1970 00:00:00 -0000
>> > +++ 
>> > devel/valgrind/patches/patch-coregrind_m_replacemalloc_vg_replace_malloc_c 
>> >     29 Sep 2023 09:44:46 -0000
>> > @@ -0,0 +1,263 @@
>> > +--- coregrind/m_replacemalloc/vg_replace_malloc.c.orig
>> > ++++ coregrind/m_replacemalloc/vg_replace_malloc.c
>> > +@@ -222,7 +222,7 @@
>> > + #define SET_ERRNO_ENOMEM if (__errno_location)        \
>> > +       (*__errno_location ()) = VKI_ENOMEM;
>> > + #define SET_ERRNO_EINVAL {}
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > + extern int *__error (void) __attribute__((weak));
>> > + #define SET_ERRNO_ENOMEM if (__error)        \
>> > +       (*__error ()) = VKI_ENOMEM;
>> > +@@ -430,7 +430,7 @@
>> > +  ALLOC_or_NULL(VG_Z_LIBC_SONAME,      malloc,      malloc);
>> > +  ALLOC_or_NULL(SO_SYN_MALLOC,         malloc,      malloc);
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  ALLOC_or_NULL(VG_Z_LIBC_SONAME,      malloc,      malloc);
>> > +  ALLOC_or_NULL(SO_SYN_MALLOC,         malloc,      malloc);
>> > + 
>> > +@@ -472,7 +472,7 @@
>> > +   ALLOC_or_BOMB(SO_SYN_MALLOC,         _Znwm,          __builtin_new);
>> > +  #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator new(unsigned int)
>> > +  #if VG_WORDSIZE == 4
>> > +   ALLOC_or_BOMB(VG_Z_LIBSTDCXX_SONAME, _Znwj,          __builtin_new);
>> > +@@ -532,7 +532,7 @@
>> > +   ALLOC_or_BOMB_ALIGNED(SO_SYN_MALLOC,         _ZnwmSt11align_val_t, 
>> > __builtin_new_aligned);
>> > +  #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator new(unsigned int)
>> > +  #if VG_WORDSIZE == 4
>> > +   ALLOC_or_BOMB_ALIGNED(VG_Z_LIBSTDCXX_SONAME, _ZnwjSt11align_val_t, 
>> > __builtin_new_aligned);
>> > +@@ -592,7 +592,7 @@
>> > +   ALLOC_or_NULL(SO_SYN_MALLOC,         _ZnwmRKSt9nothrow_t,  
>> > __builtin_new);
>> > +  #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator new(unsigned, std::nothrow_t const&)
>> > +  #if VG_WORDSIZE == 4
>> > +   ALLOC_or_NULL(VG_Z_LIBSTDCXX_SONAME, _ZnwjRKSt9nothrow_t,  
>> > __builtin_new);
>> > +@@ -652,7 +652,7 @@
>> > +   ALLOC_or_NULL_ALIGNED(SO_SYN_MALLOC,         
>> > _ZnwmSt11align_val_tRKSt9nothrow_t,  __builtin_new_aligned);
>> > +  #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator new(unsigned int, std::align_val_t, std::nothrow_t const&)
>> > +  #if VG_WORDSIZE == 4
>> > +   ALLOC_or_NULL_ALIGNED(VG_Z_LIBSTDCXX_SONAME, 
>> > _ZnwjSt11align_val_tRKSt9nothrow_t,  __builtin_new_aligned);
>> > +@@ -714,7 +714,7 @@
>> > +   ALLOC_or_BOMB(SO_SYN_MALLOC,         _Znam,             
>> > __builtin_vec_new );
>> > +  #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator new[](unsigned int)
>> > +  #if VG_WORDSIZE == 4
>> > +   ALLOC_or_BOMB(VG_Z_LIBSTDCXX_SONAME, _Znaj,             
>> > __builtin_vec_new );
>> > +@@ -774,7 +774,7 @@
>> > +   ALLOC_or_BOMB_ALIGNED(SO_SYN_MALLOC,         _ZnamSt11align_val_t, 
>> > __builtin_vec_new_aligned );
>> > +  #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator new[](unsigned int, std::align_val_t)
>> > +  #if VG_WORDSIZE == 4
>> > +   ALLOC_or_BOMB_ALIGNED(VG_Z_LIBSTDCXX_SONAME, _ZnajSt11align_val_t, 
>> > __builtin_vec_new_aligned );
>> > +@@ -835,7 +835,7 @@
>> > +   ALLOC_or_NULL(SO_SYN_MALLOC,         _ZnamRKSt9nothrow_t, 
>> > __builtin_vec_new );
>> > +  #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator new[](unsigned, std::nothrow_t const&)
>> > +  #if VG_WORDSIZE == 4
>> > +   ALLOC_or_NULL(VG_Z_LIBSTDCXX_SONAME, _ZnajRKSt9nothrow_t, 
>> > __builtin_vec_new );
>> > +@@ -895,7 +895,7 @@
>> > +   ALLOC_or_NULL_ALIGNED(SO_SYN_MALLOC,         
>> > _ZnamSt11align_val_tRKSt9nothrow_t, __builtin_vec_new_aligned );
>> > +  #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator new[](unsigned int, std::align_val_t, std::nothrow_t const&)
>> > +  #if VG_WORDSIZE == 4
>> > +   ALLOC_or_NULL_ALIGNED(VG_Z_LIBSTDCXX_SONAME, 
>> > _ZnajSt11align_val_tRKSt9nothrow_t, __builtin_vec_new_aligned );
>> > +@@ -973,7 +973,7 @@
>> > +  FREE(VG_Z_LIBC_SONAME,       free,                 free );
>> > +  FREE(SO_SYN_MALLOC,          free,                 free );
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  FREE(VG_Z_LIBC_SONAME,       free,                 free );
>> > +  FREE(SO_SYN_MALLOC,          free,                 free );
>> > + 
>> > +@@ -1024,7 +1024,7 @@
>> > +  FREE(VG_Z_LIBC_SONAME,       _ZdlPv,               __builtin_delete );
>> > +  FREE(SO_SYN_MALLOC,          _ZdlPv,               __builtin_delete );
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  FREE(VG_Z_LIBSTDCXX_SONAME,  _ZdlPv,               __builtin_delete );
>> > +  FREE(VG_Z_LIBCXX_SONAME,     _ZdlPv,               __builtin_delete );
>> > +  FREE(SO_SYN_MALLOC,          _ZdlPv,               __builtin_delete );
>> > +@@ -1072,7 +1072,7 @@
>> > +  DELETE_SIZED(SO_SYN_MALLOC,          _ZdlPvm,               
>> > __builtin_delete );
>> > + #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator delete(void*, unsigned int)
>> > + #if __SIZEOF_SIZE_T__ == 4
>> > +  DELETE_SIZED(VG_Z_LIBSTDCXX_SONAME,  _ZdlPvj,               
>> > __builtin_delete );
>> > +@@ -1160,7 +1160,7 @@
>> > +  DELETE_SIZED_ALIGNED(SO_SYN_MALLOC,          _ZdlPvmSt11align_val_t,    
>> >            __builtin_delete_aligned );
>> > + #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator delete(void*, std::align_val_t)
>> > +  DELETE_ALIGNED(VG_Z_LIBSTDCXX_SONAME,  _ZdlPvSt11align_val_t,           
>> >     __builtin_delete_aligned );
>> > +  DELETE_ALIGNED(VG_Z_LIBCXX_SONAME,     _ZdlPvSt11align_val_t,           
>> >     __builtin_delete_aligned );
>> > +@@ -1224,7 +1224,7 @@
>> > +  FREE(VG_Z_LIBC_SONAME,      _ZdlPvRKSt9nothrow_t,  __builtin_delete );
>> > +  FREE(SO_SYN_MALLOC,         _ZdlPvRKSt9nothrow_t,  __builtin_delete );
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator delete(void*, std::nothrow_t const&)
>> > +  FREE(VG_Z_LIBSTDCXX_SONAME, _ZdlPvRKSt9nothrow_t,  __builtin_delete );
>> > +  FREE(VG_Z_LIBCXX_SONAME,    _ZdlPvRKSt9nothrow_t,  __builtin_delete );
>> > +@@ -1254,7 +1254,7 @@
>> > + 
>> > +  // no sized version of this operator
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator delete(void*, std::align_val_t, std::nothrow_t const&)
>> > +  DELETE_ALIGNED(VG_Z_LIBSTDCXX_SONAME, 
>> > _ZdlPvSt11align_val_tRKSt9nothrow_t,  __builtin_delete_aligned );
>> > +  DELETE_ALIGNED(VG_Z_LIBCXX_SONAME,    
>> > _ZdlPvSt11align_val_tRKSt9nothrow_t,  __builtin_delete_aligned );
>> > +@@ -1288,7 +1288,7 @@
>> > +  FREE(VG_Z_LIBC_SONAME,       _ZdaPv,               __builtin_vec_delete 
>> > );
>> > +  FREE(SO_SYN_MALLOC,          _ZdaPv,               __builtin_vec_delete 
>> > );
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator delete[](void*)
>> > +  FREE(VG_Z_LIBSTDCXX_SONAME,  _ZdaPv,               __builtin_vec_delete 
>> > );
>> > +  FREE(VG_Z_LIBCXX_SONAME,     _ZdaPv,               __builtin_vec_delete 
>> > );
>> > +@@ -1323,7 +1323,7 @@
>> > +  DELETE_SIZED(SO_SYN_MALLOC,          _ZdaPvm,              
>> > __builtin_vec_delete );
>> > + #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator delete[](void*, unsigned int)
>> > +   #if __SIZEOF_SIZE_T__ == 4
>> > +   DELETE_SIZED(VG_Z_LIBSTDCXX_SONAME,  _ZdaPvj,              
>> > __builtin_vec_delete );
>> > +@@ -1383,7 +1383,7 @@
>> > +  DELETE_SIZED_ALIGNED(SO_SYN_MALLOC,          _ZdaPvmSt11align_val_t, 
>> > __builtin_vec_delete_aligned );
>> > + #endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator delete[](void*, std::align_val_t)
>> > +  DELETE_ALIGNED(VG_Z_LIBSTDCXX_SONAME,  _ZdaPvSt11align_val_t, 
>> > __builtin_vec_delete_aligned );
>> > +  DELETE_ALIGNED(VG_Z_LIBCXX_SONAME,     _ZdaPvSt11align_val_t, 
>> > __builtin_vec_delete_aligned );
>> > +@@ -1447,7 +1447,7 @@
>> > +  FREE(VG_Z_LIBC_SONAME,       _ZdaPvRKSt9nothrow_t, __builtin_vec_delete 
>> > );
>> > +  FREE(SO_SYN_MALLOC,          _ZdaPvRKSt9nothrow_t, __builtin_vec_delete 
>> > );
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator delete[](void*, std::nothrow_t const&)
>> > +  FREE(VG_Z_LIBSTDCXX_SONAME,  _ZdaPvRKSt9nothrow_t, __builtin_vec_delete 
>> > );
>> > +  FREE(VG_Z_LIBCXX_SONAME,     _ZdaPvRKSt9nothrow_t, __builtin_vec_delete 
>> > );
>> > +@@ -1477,7 +1477,7 @@
>> > + 
>> > +  // no sized version of this operator
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  // operator delete[](void*, std::align_val_t, std::nothrow_t const&)
>> > +  DELETE_ALIGNED(VG_Z_LIBSTDCXX_SONAME,  
>> > _ZdaPvSt11align_val_tRKSt9nothrow_t, __builtin_vec_delete_aligned );
>> > +  DELETE_ALIGNED(VG_Z_LIBCXX_SONAME,     
>> > _ZdaPvSt11align_val_tRKSt9nothrow_t, __builtin_vec_delete_aligned );
>> > +@@ -1553,7 +1553,7 @@
>> > +  CALLOC(VG_Z_LIBC_SONAME, calloc);
>> > +  CALLOC(SO_SYN_MALLOC,    calloc);
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  CALLOC(VG_Z_LIBC_SONAME, calloc);
>> > +  CALLOC(SO_SYN_MALLOC,    calloc);
>> > + 
>> > +@@ -1648,7 +1648,7 @@
>> > +  REALLOC(VG_Z_LIBC_SONAME, realloc);
>> > +  REALLOC(SO_SYN_MALLOC,    realloc);
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  REALLOC(VG_Z_LIBC_SONAME, realloc);
>> > +  REALLOC(SO_SYN_MALLOC,    realloc);
>> > +  REALLOCF(VG_Z_LIBC_SONAME, reallocf);
>> > +@@ -1734,7 +1734,7 @@
>> > +       return v; \
>> > +    }
>> > + 
>> > +-#if defined(VGO_freebsd)
>> > ++#if defined(VGO_freebsd) || defined(VGO_openbsd)
>> > + #define VG_MEMALIGN_MAKE_SIZE_MULTIPLE_ALIGN 1
>> > + #else
>> > + #define VG_MEMALIGN_MAKE_SIZE_MULTIPLE_ALIGN 0
>> > +@@ -1834,7 +1834,7 @@
>> > +  MEMALIGN(VG_Z_LIBC_SONAME, memalign);
>> > +  MEMALIGN(SO_SYN_MALLOC,    memalign);
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  MEMALIGN(VG_Z_LIBC_SONAME, memalign);
>> > +  MEMALIGN(SO_SYN_MALLOC,    memalign);
>> > + 
>> > +@@ -1890,7 +1890,7 @@
>> > +  VALLOC(VG_Z_LIBC_SONAME, valloc);
>> > +  VALLOC(SO_SYN_MALLOC, valloc);
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  VALLOC(VG_Z_LIBC_SONAME, valloc);
>> > +  VALLOC(SO_SYN_MALLOC, valloc);
>> > + 
>> > +@@ -2031,7 +2031,7 @@
>> > +  POSIX_MEMALIGN(VG_Z_LIBC_SONAME, posix_memalign);
>> > +  POSIX_MEMALIGN(SO_SYN_MALLOC,    posix_memalign);
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  POSIX_MEMALIGN(VG_Z_LIBC_SONAME, posix_memalign);
>> > +  POSIX_MEMALIGN(SO_SYN_MALLOC,    posix_memalign);
>> > + 
>> > +@@ -2176,7 +2176,7 @@
>> > +   ALIGNED_ALLOC(VG_Z_LIBC_SONAME, aligned_alloc);
>> > +   ALIGNED_ALLOC(SO_SYN_MALLOC,    aligned_alloc);
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  ALIGNED_ALLOC(G_Z_LIBC_SONAME, aligned_alloc);
>> > +  ALIGNED_ALLOC(SO_SYN_MALLOC,   aligned_alloc);
>> > + 
>> > +@@ -2220,7 +2220,7 @@
>> > +   MALLOC_USABLE_SIZE(SO_SYN_MALLOC,    dlmalloc_usable_size);
>> > + # endif
>> > + 
>> > +-#elif defined(VGO_freebsd)
>> > ++#elif defined(VGO_freebsd) || defined(VGO_openbsd)
>> > +  MALLOC_USABLE_SIZE(VG_Z_LIBC_SONAME, malloc_usable_size);
>> > +  MALLOC_USABLE_SIZE(SO_SYN_MALLOC,    malloc_usable_size);
>> > + 
>> > Index: devel/valgrind/patches/patch-coregrind_m_ume_elf_c
>> > ===================================================================
>> > RCS file: /cvs/ports/devel/valgrind/patches/patch-coregrind_m_ume_elf_c,v
>> > retrieving revision 1.3
>> > diff -u -p -r1.3 patch-coregrind_m_ume_elf_c
>> > --- devel/valgrind/patches/patch-coregrind_m_ume_elf_c     18 Jul 2023 
>> > 06:17:15 -0000      1.3
>> > +++ devel/valgrind/patches/patch-coregrind_m_ume_elf_c     29 Sep 2023 
>> > 09:44:46 -0000
>> > @@ -71,8 +71,21 @@
>> >      for (i = 0; i < e->e.e_phnum; i++) {
>> >         ESZ(Phdr) *ph = &e->p[i];
>> >         ESZ(Addr) addr, bss, brkaddr;
>> > -@@ -437,6 +476,11 @@
>> > +@@ -435,8 +474,24 @@
>> > +       filesz  = ph->p_filesz;
>> > +       bss     = addr+filesz;
>> >         memsz   = ph->p_memsz;
>> > ++#if defined(VGO_openbsd)
>> > ++      // On OpenBSD, p_filesz of the BSS area is set to 0. Also, if the 
>> > lower
>> > ++      // 12 bits of addr is 0, bss and addr have the same value. 
>> > Therefore,
>> > ++      // VG_PGROUNDUP(bss)-VG_PGROUNDDN(addr) = 0, the following
>> > ++      // `if (VG_PGROUNDUP(bss)-VG_PGROUNDDN(addr)' statement becomes 
>> > false,
>> > ++      // and VG_(am_mmap_file_fixed_client)() is not called. 
>> > Additionally,
>> > ++      // di_notify_ACHIEVE_ACCEPT_STATE() is not called and the 
>> > first_epoch
>> > ++      // variable in DebugInfo is not set to a valid value.
>> > ++      if ((addr & 0xfff) == 0 && filesz == 0)
>> > ++         bss += memsz;
>> > ++#endif
>> >         brkaddr = addr+memsz;
>> >   
>> >  +#if defined(VGO_openbsd)
>> > @@ -83,7 +96,7 @@
>> >         // Tom says: In the following, do what the Linux kernel does and 
>> > only
>> >         // map the pages that are required instead of rounding everything 
>> > to
>> >         // the specified alignment (ph->p_align).  (AMD64 doesn't work if 
>> > you
>> > -@@ -460,6 +504,7 @@
>> > +@@ -460,6 +515,7 @@
>> >         if (memsz > filesz) {
>> >            UInt bytes;
>> >   
>> > @@ -91,7 +104,7 @@
>> >            bytes = VG_PGROUNDUP(brkaddr)-VG_PGROUNDUP(bss);
>> >            if (bytes > 0) {
>> >               if (0) VG_(debugLog)(0,"ume","mmap_anon_fixed_client #2\n");
>> > -@@ -478,6 +523,42 @@
>> > +@@ -478,6 +534,42 @@
>> >               bytes = VKI_PAGE_SIZE - bytes;
>> >               VG_(memset)((void *)bss, 0, bytes);
>> >            }
>> > @@ -134,7 +147,7 @@
>> >         }
>> >      }
>> >   
>> > -@@ -879,7 +960,7 @@
>> > +@@ -879,7 +971,7 @@
>> >      return 0;
>> >   }
>> >   
>> > 

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