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Don't underestimate length of DST substitution

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Andreas Schwab 2010-03-12 07:57:19 -08:00 committed by Ulrich Drepper
parent 4bf7d39245
commit 4c35fb65c9
2 changed files with 18 additions and 8 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2010-03-12 Andreas Schwab <schwab@redhat.com>
* elf/dl-dst.h: Include "trusted-dirs.h".
(DL_DST_REQUIRED): Take $LIB into account.
2010-03-11 Roland McGrath <roland@redhat.com>
* elf/elf.h (R_X86_64_GOT64, R_X86_64_GOTPCREL64): New macros.

21
elf/dl-dst.h
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@ -18,6 +18,8 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include "trusted-dirs.h"
/* Determine the number of DST elements in the name. Only if IS_PATH is
nonzero paths are recognized (i.e., multiple, ':' separated filenames). */
#define DL_DST_COUNT(name, is_path) \
@ -39,12 +41,13 @@
\
if (__cnt > 0) \
{ \
size_t origin_len; \
size_t dst_len; \
/* Now we make a guess how many extra characters on top of the \
length of S we need to represent the result. We know that \
we have CNT replacements. Each at most can use \
MAX (strlen (ORIGIN), strlen (_dl_platform)) \
minus 7 (which is the length of "$ORIGIN"). \
MAX (MAX (strlen (ORIGIN), strlen (_dl_platform)), \
strlen (DL_DST_LIB)) \
minus 4 (which is the length of "$LIB"). \
\
First get the origin string if it is not available yet. \
This can only happen for the map of the executable. */ \
@ -53,14 +56,16 @@
{ \
assert ((l)->l_name[0] == '\0'); \
(l)->l_origin = _dl_get_origin (); \
origin_len = ((l)->l_origin && (l)->l_origin != (char *) -1 \
dst_len = ((l)->l_origin && (l)->l_origin != (char *) -1 \
? strlen ((l)->l_origin) : 0); \
} \
else \
origin_len = (l)->l_origin == (char *) -1 \
dst_len = (l)->l_origin == (char *) -1 \
? 0 : strlen ((l)->l_origin); \
\
__len += __cnt * (MAX (origin_len, GLRO(dl_platformlen)) - 7); \
dst_len = MAX (MAX (dst_len, GLRO(dl_platformlen)), \
strlen (DL_DST_LIB)); \
if (dst_len > 4) \
__len += __cnt * (dst_len - 4); \
} \
\
__len; })
@ -72,7 +77,7 @@
if ((l) == NULL) \
{ \
const char *origin = _dl_get_origin (); \
origin_len = (origin && origin != (char *) -1 ? strlen (origin) : 0); \
dst_len = (origin && origin != (char *) -1 ? strlen (origin) : 0); \
} \
else
#endif