diff options
Diffstat (limited to 'elf/rtld.c')
| -rw-r--r-- | elf/rtld.c | 73 |
1 files changed, 60 insertions, 13 deletions
diff --git a/elf/rtld.c b/elf/rtld.c index 578fc14cdb..6e8ed430e2 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -1301,6 +1301,62 @@ rtld_setup_main_map (struct link_map *main_map) return has_interp; } +/* Adjusts the contents of the stack and related globals for the user + entry point. The ld.so processed skip_args arguments and bumped + _dl_argv and _dl_argc accordingly. Those arguments are removed from + argv here. */ +static void +_dl_start_args_adjust (int skip_args) +{ + void **sp = (void **) (_dl_argv - skip_args - 1); + void **p = sp + skip_args; + + if (skip_args == 0) + return; + + /* Sanity check. */ + intptr_t argc = (intptr_t) sp[0] - skip_args; + assert (argc == _dl_argc); + + /* Adjust argc on stack. */ + sp[0] = (void *) (intptr_t) _dl_argc; + + /* Update globals in rtld. */ + _dl_argv -= skip_args; + _environ -= skip_args; + + /* Shuffle argv down. */ + do + *++sp = *++p; + while (*p != NULL); + + assert (_environ == (char **) (sp + 1)); + + /* Shuffle envp down. */ + do + *++sp = *++p; + while (*p != NULL); + +#ifdef HAVE_AUX_VECTOR + void **auxv = (void **) GLRO(dl_auxv) - skip_args; + GLRO(dl_auxv) = (ElfW(auxv_t) *) auxv; /* Aliasing violation. */ + assert (auxv == sp + 1); + + /* Shuffle auxv down. */ + ElfW(auxv_t) ax; + char *oldp = (char *) (p + 1); + char *newp = (char *) (sp + 1); + do + { + memcpy (&ax, oldp, sizeof (ax)); + memcpy (newp, &ax, sizeof (ax)); + oldp += sizeof (ax); + newp += sizeof (ax); + } + while (ax.a_type != AT_NULL); +#endif +} + static void dl_main (const ElfW(Phdr) *phdr, ElfW(Word) phnum, @@ -1354,6 +1410,7 @@ dl_main (const ElfW(Phdr) *phdr, rtld_is_main = true; char *argv0 = NULL; + char **orig_argv = _dl_argv; /* Note the place where the dynamic linker actually came from. */ GL(dl_rtld_map).l_name = rtld_progname; @@ -1368,7 +1425,6 @@ dl_main (const ElfW(Phdr) *phdr, GLRO(dl_lazy) = -1; } - ++_dl_skip_args; --_dl_argc; ++_dl_argv; } @@ -1377,14 +1433,12 @@ dl_main (const ElfW(Phdr) *phdr, if (state.mode != rtld_mode_help) state.mode = rtld_mode_verify; - ++_dl_skip_args; --_dl_argc; ++_dl_argv; } else if (! strcmp (_dl_argv[1], "--inhibit-cache")) { GLRO(dl_inhibit_cache) = 1; - ++_dl_skip_args; --_dl_argc; ++_dl_argv; } @@ -1394,7 +1448,6 @@ dl_main (const ElfW(Phdr) *phdr, state.library_path = _dl_argv[2]; state.library_path_source = "--library-path"; - _dl_skip_args += 2; _dl_argc -= 2; _dl_argv += 2; } @@ -1403,7 +1456,6 @@ dl_main (const ElfW(Phdr) *phdr, { GLRO(dl_inhibit_rpath) = _dl_argv[2]; - _dl_skip_args += 2; _dl_argc -= 2; _dl_argv += 2; } @@ -1411,14 +1463,12 @@ dl_main (const ElfW(Phdr) *phdr, { audit_list_add_string (&state.audit_list, _dl_argv[2]); - _dl_skip_args += 2; _dl_argc -= 2; _dl_argv += 2; } else if (! strcmp (_dl_argv[1], "--preload") && _dl_argc > 2) { state.preloadarg = _dl_argv[2]; - _dl_skip_args += 2; _dl_argc -= 2; _dl_argv += 2; } @@ -1426,7 +1476,6 @@ dl_main (const ElfW(Phdr) *phdr, { argv0 = _dl_argv[2]; - _dl_skip_args += 2; _dl_argc -= 2; _dl_argv += 2; } @@ -1434,7 +1483,6 @@ dl_main (const ElfW(Phdr) *phdr, && _dl_argc > 2) { state.glibc_hwcaps_prepend = _dl_argv[2]; - _dl_skip_args += 2; _dl_argc -= 2; _dl_argv += 2; } @@ -1442,7 +1490,6 @@ dl_main (const ElfW(Phdr) *phdr, && _dl_argc > 2) { state.glibc_hwcaps_mask = _dl_argv[2]; - _dl_skip_args += 2; _dl_argc -= 2; _dl_argv += 2; } @@ -1451,7 +1498,6 @@ dl_main (const ElfW(Phdr) *phdr, { state.mode = rtld_mode_list_tunables; - ++_dl_skip_args; --_dl_argc; ++_dl_argv; } @@ -1460,7 +1506,6 @@ dl_main (const ElfW(Phdr) *phdr, { state.mode = rtld_mode_list_diagnostics; - ++_dl_skip_args; --_dl_argc; ++_dl_argv; } @@ -1506,7 +1551,6 @@ dl_main (const ElfW(Phdr) *phdr, _dl_usage (ld_so_name, NULL); } - ++_dl_skip_args; --_dl_argc; ++_dl_argv; @@ -1605,6 +1649,9 @@ dl_main (const ElfW(Phdr) *phdr, /* Set the argv[0] string now that we've processed the executable. */ if (argv0 != NULL) _dl_argv[0] = argv0; + + /* Adjust arguments for the application entry point. */ + _dl_start_args_adjust (_dl_argv - orig_argv); } else { |