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authorEric Andersen <andersen@codepoet.org>2002-05-24 05:32:40 +0000
committerEric Andersen <andersen@codepoet.org>2002-05-24 05:32:40 +0000
commita87ae1623778025557ef375528e3a2c702bbcfca (patch)
tree18f32b655e7fe2124ca31786f1ff1370d804490e /ldso
parent810c04099bbb32dfde1697a4b59d1ab7f18b8eea (diff)
Fix ldd so it correctly handles search paths of just one entry
(per fix in ldso a while back), and correctly matches the search order in the shared lib loader. -Erik
Diffstat (limited to 'ldso')
-rw-r--r--ldso/util/ldd.c56
1 files changed, 29 insertions, 27 deletions
diff --git a/ldso/util/ldd.c b/ldso/util/ldd.c
index 3cbdf61aa..18efc50bd 100644
--- a/ldso/util/ldd.c
+++ b/ldso/util/ldd.c
@@ -53,6 +53,8 @@ struct library {
};
struct library *lib_list = NULL;
char not_found[] = "not found";
+char *interp = NULL;
+char *interp_dir = NULL;
int byteswap;
inline uint32_t byteswap32_to_host(uint32_t value)
@@ -147,7 +149,7 @@ int check_elf_header(Elf32_Ehdr *const ehdr)
* in uClibc/ldso/d-link/readelflib1.c */
static void search_for_named_library(char *name, char *result, const char *path_list)
{
- int i, count = 0;
+ int i, count = 1;
char *path, *path_n;
struct stat filestat;
@@ -171,11 +173,9 @@ static void search_for_named_library(char *name, char *result, const char *path_
count++;
}
}
-
path_n = path;
for (i = 0; i < count; i++) {
- *result = '\0';
- strcat(result, path_n);
+ strcpy(result, path_n);
strcat(result, "/");
strcat(result, name);
if (stat (result, &filestat) == 0 && filestat.st_mode & S_IRUSR) {
@@ -188,8 +188,8 @@ static void search_for_named_library(char *name, char *result, const char *path_
*result = '\0';
}
-void locate_library_file(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *strtab, int is_suid,
- struct library *lib, char *ldpath)
+void locate_library_file(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *strtab,
+ int is_suid, struct library *lib)
{
char *buf;
char *path;
@@ -236,18 +236,20 @@ void locate_library_file(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *strtab, int
}
}
- if (ldpath) {
- search_for_named_library(lib->name, buf, ldpath);
- if (*buf != '\0') {
- lib->path = buf;
- return;
- }
- }
-
#ifdef USE_CACHE
/* FIXME -- add code to check the Cache here */
#endif
+
+ /* Next look for libraries wherever the shared library
+ * loader was installed -- this is usually where we
+ * should find things... */
+ search_for_named_library(lib->name, buf, interp_dir);
+ if (*buf != '\0') {
+ lib->path = buf;
+ return;
+ }
+
/* Lastly, search the standard list of paths for the library.
This list must exactly match the list in uClibc/ldso/d-link/readelflib1.c */
path = UCLIBC_TARGET_PREFIX "/usr/lib:"
@@ -265,7 +267,7 @@ void locate_library_file(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *strtab, int
}
}
-static int add_library(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *strtab, int is_setuid, char *s, char *ldpath)
+static int add_library(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *strtab, int is_setuid, char *s)
{
char *tmp, *tmp1, *tmp2;
struct library *cur, *newlib=lib_list;
@@ -309,7 +311,7 @@ static int add_library(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *strtab, int i
newlib->next = NULL;
/* Now try and locate where this library might be living... */
- locate_library_file(ehdr, dynamic, strtab, is_setuid, newlib, ldpath);
+ locate_library_file(ehdr, dynamic, strtab, is_setuid, newlib);
//printf("add_library is adding '%s' to '%s'\n", newlib->name, newlib->path);
if (!lib_list) {
@@ -324,21 +326,12 @@ static int add_library(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *strtab, int i
static void find_needed_libraries(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *strtab, int is_setuid)
{
- char * ldpath = NULL;
Elf32_Dyn *dyns;
- Elf32_Phdr *phdr;
-
- /* Find the path where the shared lib loader lives */
- phdr = elf_find_phdr_type(PT_INTERP, ehdr);
- if (phdr) {
- ldpath = strdup((char*)ehdr + byteswap32_to_host(phdr->p_offset));
- ldpath = basename(ldpath);
- }
for (dyns=dynamic; byteswap32_to_host(dyns->d_tag)!=DT_NULL; ++dyns) {
if (DT_NEEDED == byteswap32_to_host(dyns->d_tag)) {
add_library(ehdr, dynamic, strtab, is_setuid, (char*)strtab +
- byteswap32_to_host(dyns->d_un.d_val), ldpath);
+ byteswap32_to_host(dyns->d_un.d_val));
}
}
}
@@ -357,6 +350,11 @@ static void find_elf_interpreter(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *str
char *s = (char*)ehdr + byteswap32_to_host(phdr->p_offset);
char *tmp, *tmp1;
+ interp = strdup(s);
+ interp_dir = strdup(s);
+ tmp = strrchr(interp_dir, '/');
+ if (*tmp)
+ *tmp = '\0';
tmp1 = tmp = s;
while (*tmp) {
if (*tmp == '/')
@@ -383,6 +381,7 @@ static void find_elf_interpreter(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *str
newlib->resolved = 1;
newlib->next = NULL;
+#if 0
//printf("find_elf_interpreter is adding '%s' to '%s'\n", newlib->name, newlib->path);
if (!lib_list) {
lib_list = newlib;
@@ -390,6 +389,7 @@ static void find_elf_interpreter(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, char *str
for (cur = lib_list; cur->next; cur=cur->next); /* nothing */
cur->next = newlib;
}
+#endif
}
}
@@ -449,12 +449,12 @@ foo:
}
dynsec = elf_find_section_type(SHT_DYNAMIC, ehdr);
+ find_elf_interpreter(ehdr, dynamic, dynstr, is_suid);
if (dynsec) {
dynamic = (Elf32_Dyn*)(byteswap32_to_host(dynsec->sh_offset) + (int)ehdr);
dynstr = (char *)elf_find_dynamic(DT_STRTAB, dynamic, ehdr, 0);
find_needed_libraries(ehdr, dynamic, dynstr, is_suid);
}
- find_elf_interpreter(ehdr, dynamic, dynstr, is_suid);
return 0;
}
@@ -495,6 +495,8 @@ int main( int argc, char** argv)
got_em_all=1;
printf("\t%s => %s\n", cur->name, cur->path);
}
+ if (got_em_all==1)
+ printf("\t%s => %s\n", interp, interp);
if (got_em_all==0)
printf("\tnot a dynamic executable\n");