diff options
Diffstat (limited to 'sysdeps/mach/hurd/dl-sysdep.c')
| -rw-r--r-- | sysdeps/mach/hurd/dl-sysdep.c | 47 |
1 files changed, 38 insertions, 9 deletions
diff --git a/sysdeps/mach/hurd/dl-sysdep.c b/sysdeps/mach/hurd/dl-sysdep.c index 099b84bc1c..6dfd9ed22b 100644 --- a/sysdeps/mach/hurd/dl-sysdep.c +++ b/sysdeps/mach/hurd/dl-sysdep.c @@ -184,16 +184,45 @@ unfmh(); /* XXX */ _dl_hurd_data->phdrsz / sizeof (Elf32_Phdr), &_dl_hurd_data->user_entry); - if (_dl_skip_args && _dl_argv[-_dl_skip_args] == (char *) p) + /* The call above might screw a few things up. + + First of all, if _dl_skip_args is nonzero, we are ignoring + the first few arguments. However, if we have no Hurd startup + data, it is the magical convention that ARGV[0] == P. The + startup code in init-first.c will get confused if this is not + the case, so we must rearrange things to make it so. We'll + overwrite the origional ARGV[0] at P with ARGV[_dl_skip_args]. + + Secondly, if we need to be secure, it removes some dangerous + environment variables. If we have no Hurd startup date this + changes P (since that's the location after the terminating + NULL in the list of environment variables). We do the same + thing as in the first case but make sure we recalculate P. + If we do have Hurd startup data, we have to move the data + such that it starts just after the terminating NULL in the + environment list. + + We use memmove, since the locations might overlap. */ + if (__libc_enable_secure || _dl_skip_args) { - /* We are ignoring the first few arguments, but we have no Hurd - startup data. It is magical convention that ARGV[0] == P in - this case. The startup code in init-first.c will get confused - if this is not the case, so we must rearrange things to make - it so. Overwrite the original ARGV[0] at P with - ARGV[_dl_skip_args]. */ - assert ((char *) p < _dl_argv[0]); - _dl_argv[0] = strcpy ((char *) p, _dl_argv[0]); + char **newp; + + for (newp = _environ; *newp++;); + + if (_dl_argv[-_dl_skip_args] == (char *) p) + { + if ((char *) newp != _dl_argv[0]) + { + assert ((char *) newp < _dl_argv[0]); + _dl_argv[0] = memmove ((char *) newp, _dl_argv[0], + strlen (_dl_argv[0]) + 1); + } + } + else + { + if ((void *) newp != _dl_hurd_data) + memmove (newp, _dl_hurd_data, sizeof (*_dl_hurd_data)); + } } { |