From cc00cecef5cca965191cd8f75aec85d6b4bb399a Mon Sep 17 00:00:00 2001 From: Carlos O'Donell Date: Tue, 28 Oct 2014 19:37:07 -0400 Subject: elf/dl-load.c: Use __strdup. During a refactoring pass several repeated blocks of code in dl-load.c were turned into a call to a local function named local_strdup. There is no need for local_strdup, and the routines should instead call __strdup. This change does just that. We call the internal symbol __strdup because calling strdup is unsafe. The user might be using a standard that doesn't include strdup and may have defined this symbol in their application. During a static link we might reference the user defined symbol and crash if it doesn't implement a standards conforming strdup. The resulting code is simpler to understand, and makes it easier to debug. No regressions on x86_64. 2014-10-28 Carlos O'Donell * dl-load.c (local_strdup): Remove. (expand_dynamic_string_token): Use __strdup. (decompose_rpath): Likewise. (_dl_map_object): Likewise. --- elf/dl-load.c | 24 +++++------------------- 1 file changed, 5 insertions(+), 19 deletions(-) (limited to 'elf') diff --git a/elf/dl-load.c b/elf/dl-load.c index 9dd40e3d0a..ce5b626b26 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -112,20 +112,6 @@ static const size_t system_dirs_len[] = (sizeof (system_dirs_len) / sizeof (system_dirs_len[0])) -/* Local version of `strdup' function. */ -static char * -local_strdup (const char *s) -{ - size_t len = strlen (s) + 1; - void *new = malloc (len); - - if (new == NULL) - return NULL; - - return (char *) memcpy (new, s, len); -} - - static bool is_trusted_path (const char *path, size_t len) { @@ -384,7 +370,7 @@ expand_dynamic_string_token (struct link_map *l, const char *s, int is_path) /* If we do not have to replace anything simply copy the string. */ if (__glibc_likely (cnt == 0)) - return local_strdup (s); + return __strdup (s); /* Determine the length of the substituted string. */ total = DL_DST_REQUIRED (l, s, strlen (s), cnt); @@ -593,7 +579,7 @@ decompose_rpath (struct r_search_path_struct *sps, } /* Make a writable copy. */ - copy = local_strdup (rpath); + copy = __strdup (rpath); if (copy == NULL) { errstring = N_("cannot create RUNPATH/RPATH copy"); @@ -2101,7 +2087,7 @@ _dl_map_object (struct link_map *loader, const char *name, false); if (__glibc_likely (fd != -1)) { - realname = local_strdup (cached); + realname = __strdup (cached); if (realname == NULL) { __close (fd); @@ -2130,7 +2116,7 @@ _dl_map_object (struct link_map *loader, const char *name, /* The path may contain dynamic string tokens. */ realname = (loader ? expand_dynamic_string_token (loader, name, 0) - : local_strdup (name)); + : __strdup (name)); if (realname == NULL) fd = -1; else @@ -2164,7 +2150,7 @@ _dl_map_object (struct link_map *loader, const char *name, static const Elf_Symndx dummy_bucket = STN_UNDEF; /* Allocate a new object map. */ - if ((name_copy = local_strdup (name)) == NULL + if ((name_copy = __strdup (name)) == NULL || (l = _dl_new_object (name_copy, name, type, loader, mode, nsid)) == NULL) { -- cgit 1.4.1