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Avoid crashing in LD_DEBUG when program name is unavailable

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Resolves: #15465

The program name may be unavailable if the user application tampers
with argc and argv[].  Some parts of the dynamic linker caters for
this while others don't, so this patch consolidates the check and
fallback into a single macro and updates all users.
This commit is contained in:
Siddhesh Poyarekar
2013-05-29 21:30:20 +05:30
parent d0501bfbe2
commit b937534868
41 changed files with 220 additions and 103 deletions
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5
elf/dl-init.c
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@ -54,7 +54,7 @@ call_init (struct link_map *l, int argc, char **argv, char **env)
/* Print a debug message if wanted. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
_dl_debug_printf ("\ncalling init: %s\n\n",
l->l_name[0] ? l->l_name : rtld_progname);
DSO_FILENAME (l->l_name));
/* Now run the local constructors. There are two forms of them:
- the one named by DT_INIT
@ -110,8 +110,7 @@ _dl_init (struct link_map *main_map, int argc, char **argv, char **env)
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
_dl_debug_printf ("\ncalling preinit: %s\n\n",
main_map->l_name[0]
? main_map->l_name : rtld_progname);
DSO_FILENAME (main_map->l_name));
addrs = (ElfW(Addr) *) (preinit_array->d_un.d_ptr + main_map->l_addr);
for (cnt = 0; cnt < i; ++cnt)