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static tls memory leak on TLS_DTV_AT_TP archs

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Alan Modra 2011-05-07 21:27:51 -04:00 committed by Ulrich Drepper
parent c1e9ea3517
commit 66bdbaa452
3 changed files with 45 additions and 25 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2011-03-15 Alan Modra <amodra@gmail.com>
* elf/dl-reloc.c (_dl_try_allocate_static_tls <TLS_DTV_AT_TP>): Handle
l_tls_firstbyte_offset non-zero. Save padding offset in
l_tls_firstbyte_offset for later use.
* elf/dl-close.c (_dl_close_worker <TLS_DTV_AT_TP>): Correct code
freeing static tls block.
2011-03-05 Jonathan Nieder <jrnieder@gmail.com>
* sysdeps/unix/sysv/linux/sys/param.h: Fix an #ifndef __undef_ARG_MAX

36
elf/dl-close.c
View File

@ -591,21 +591,37 @@ _dl_close_worker (struct link_map *map)
}
}
#elif TLS_DTV_AT_TP
if ((size_t) imap->l_tls_offset == tls_free_end)
if (tls_free_start == NO_TLS_OFFSET)
{
tls_free_start = imap->l_tls_firstbyte_offset;
tls_free_end = (imap->l_tls_offset
+ imap->l_tls_blocksize);
}
else if (imap->l_tls_firstbyte_offset == tls_free_end)
/* Extend the contiguous chunk being reclaimed. */
tls_free_end -= imap->l_tls_blocksize;
tls_free_end = imap->l_tls_offset + imap->l_tls_blocksize;
else if (imap->l_tls_offset + imap->l_tls_blocksize
== tls_free_start)
/* Extend the chunk backwards. */
tls_free_start = imap->l_tls_offset;
else
tls_free_start = imap->l_tls_firstbyte_offset;
/* This isn't contiguous with the last chunk freed.
One of them will be leaked unless we can free
one block right away. */
else if (imap->l_tls_offset + imap->l_tls_blocksize
== GL(dl_tls_static_used))
GL(dl_tls_static_used) = imap->l_tls_firstbyte_offset;
else if (tls_free_end == GL(dl_tls_static_used))
{
/* This isn't contiguous with the last chunk freed.
One of them will be leaked. */
if (tls_free_end == GL(dl_tls_static_used))
GL(dl_tls_static_used) = tls_free_start;
tls_free_start = imap->l_tls_offset;
tls_free_end = tls_free_start + imap->l_tls_blocksize;
GL(dl_tls_static_used) = tls_free_start;
tls_free_start = imap->l_tls_firstbyte_offset;
tls_free_end = imap->l_tls_offset + imap->l_tls_blocksize;
}
else if (tls_free_end < imap->l_tls_firstbyte_offset)
{
/* We pick the later block. It has a chance to
be freed. */
tls_free_start = imap->l_tls_firstbyte_offset;
tls_free_end = imap->l_tls_offset + imap->l_tls_blocksize;
}
#else
# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"

26
elf/dl-reloc.c
View File

@ -1,5 +1,5 @@
/* Relocate a shared object and resolve its references to other loaded objects.
Copyright (C) 1995-2006, 2008, 2009, 2010 Free Software Foundation, Inc.
Copyright (C) 1995-2006, 2008-2010, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -57,38 +57,34 @@ _dl_try_allocate_static_tls (struct link_map *map)
}
#if TLS_TCB_AT_TP
size_t freebytes;
size_t n;
size_t blsize;
freebytes = GL(dl_tls_static_size) - GL(dl_tls_static_used);
size_t freebytes = GL(dl_tls_static_size) - GL(dl_tls_static_used);
if (freebytes < TLS_TCB_SIZE)
goto fail;
freebytes -= TLS_TCB_SIZE;
blsize = map->l_tls_blocksize + map->l_tls_firstbyte_offset;
size_t blsize = map->l_tls_blocksize + map->l_tls_firstbyte_offset;
if (freebytes < blsize)
goto fail;
n = (freebytes - blsize) / map->l_tls_align;
size_t n = (freebytes - blsize) / map->l_tls_align;
size_t offset = GL(dl_tls_static_used) + (freebytes - n * map->l_tls_align
- map->l_tls_firstbyte_offset);
map->l_tls_offset = GL(dl_tls_static_used) = offset;
#elif TLS_DTV_AT_TP
size_t used;
size_t check;
size_t offset = roundup (GL(dl_tls_static_used), map->l_tls_align);
used = offset + map->l_tls_blocksize;
check = used;
/* dl_tls_static_used includes the TCB at the beginning. */
size_t offset = (((GL(dl_tls_static_used)
- map->l_tls_firstbyte_offset
+ map->l_tls_align - 1) & -map->l_tls_align)
+ map->l_tls_firstbyte_offset);
size_t used = offset + map->l_tls_blocksize;
if (check > GL(dl_tls_static_size))
if (used > GL(dl_tls_static_size))
goto fail;
map->l_tls_offset = offset;
map->l_tls_firstbyte_offset = GL(dl_tls_static_used);
GL(dl_tls_static_used) = used;
#else
# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"