diff options
Diffstat (limited to 'elf/dl-open.c')
| -rw-r--r-- | elf/dl-open.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/elf/dl-open.c b/elf/dl-open.c index df9f29a5e5..9819b49e4f 100644 --- a/elf/dl-open.c +++ b/elf/dl-open.c @@ -35,6 +35,7 @@ #include <libc-internal.h> #include <array_length.h> #include <internal-signals.h> +#include <libc-early-init.h> #include <dl-dst.h> #include <dl-prop.h> @@ -53,6 +54,13 @@ struct dl_open_args /* Namespace ID. */ Lmid_t nsid; + /* Set to true if libc.so was already loaded into the namespace at + the time dl_open_worker was called. This is used to determine + whether libc.so early initialization needs to before, and whether + to roll back the cached libc_map value in the namespace in case + of a dlopen failure. */ + bool libc_already_loaded; + /* Original signal mask. Used for unblocking signal handlers before running ELF constructors. */ sigset_t original_signal_mask; @@ -511,6 +519,11 @@ dl_open_worker (void *a) args->nsid = call_map->l_ns; } + /* The namespace ID is now known. Keep track of whether libc.so was + already loaded, to determine whether it is necessary to call the + early initialization routine (or clear libc_map on error). */ + args->libc_already_loaded = GL(dl_ns)[args->nsid].libc_map != NULL; + /* Retain the old value, so that it can be restored. */ args->original_global_scope_pending_adds = GL (dl_ns)[args->nsid]._ns_global_scope_pending_adds; @@ -745,6 +758,11 @@ dl_open_worker (void *a) if (relocation_in_progress) LIBC_PROBE (reloc_complete, 3, args->nsid, r, new); + /* If libc.so was not there before, attempt to call its early + initialization routine. */ + if (!args->libc_already_loaded) + _dl_call_libc_early_init (GL(dl_ns)[args->nsid].libc_map); + #ifndef SHARED DL_STATIC_INIT (new); #endif @@ -843,6 +861,7 @@ no more namespaces available for dlmopen()")); args.caller_dlopen = caller_dlopen; args.map = NULL; args.nsid = nsid; + args.libc_already_loaded = true; /* No reset below with early failure. */ args.argc = argc; args.argv = argv; args.env = env; @@ -875,6 +894,11 @@ no more namespaces available for dlmopen()")); /* See if an error occurred during loading. */ if (__glibc_unlikely (exception.errstring != NULL)) { + /* Avoid keeping around a dangling reference to the libc.so link + map in case it has been cached in libc_map. */ + if (!args.libc_already_loaded) + GL(dl_ns)[nsid].libc_map = NULL; + /* Remove the object from memory. It may be in an inconsistent state if relocation failed, for example. */ if (args.map) |