diff options
Diffstat (limited to 'sysdeps/generic/dl-sysdep.c')
| -rw-r--r-- | sysdeps/generic/dl-sysdep.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/sysdeps/generic/dl-sysdep.c b/sysdeps/generic/dl-sysdep.c index 546993dbd1..4d5faad69f 100644 --- a/sysdeps/generic/dl-sysdep.c +++ b/sysdeps/generic/dl-sysdep.c @@ -40,6 +40,7 @@ _dl_sysdep_start (void **start_argptr, Elf32_auxv_t *av; uid_t uid, euid; gid_t gid, egid; + unsigned int seen; user_entry = (Elf32_Addr) &_start; _dl_argc = *(int *) start_argptr; @@ -49,7 +50,12 @@ _dl_sysdep_start (void **start_argptr, while (*start_argptr) ++start_argptr; - for (av = (void *) ++start_argptr; av->a_type != AT_NULL; ++av) + seen = 0; +#define M(type) (1 << (type)) + + for (av = (void *) ++start_argptr; + av->a_type != AT_NULL; + seen |= M ((++av)->a_type)) switch (av->a_type) { case AT_PHDR: @@ -75,6 +81,16 @@ _dl_sysdep_start (void **start_argptr, break; } + /* Linux doesn't provide us with any of these values on the stack + when the dynamic linker is run directly as a program. */ + +#define SEE(UID, uid) if ((seen & M (AT_##UID)) == 0) uid = __get##uid () + SEE (UID, uid); + SEE (GID, gid); + SEE (EUID, euid); + SEE (EGID, egid); + + _dl_secure = uid != euid || gid != egid; #ifdef DL_SYSDEP_INIT |