diff options
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | elf/dl-load.c | 18 | ||||
| -rw-r--r-- | include/elf.h | 2 |
3 files changed, 22 insertions, 5 deletions
@@ -1,3 +1,10 @@ +2019-06-18 Florian Weimer <fweimer@redhat.com> + + [BZ #24323] + * include/elf.h (DT_1_SUPPORTED_MASK): Include DF_1_PIE. + * elf/dl-load.c (_dl_map_object_from_fd): Check for DF_1_PIE and + fail when called from dlopen. + 2019-07-10 DJ Delorie <dj@redhat.com> Sergei Trofimovich <slyfox@inbox.ru> diff --git a/elf/dl-load.c b/elf/dl-load.c index c51e4b3718..162a78cb0d 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -1173,6 +1173,10 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd, goto call_lose; } + /* dlopen of an executable is not valid because it is not possible + to perform proper relocations, handle static TLS, or run the + ELF constructors. For PIE, the check needs the dynamic + section, so there is another check below. */ if (__glibc_unlikely (type != ET_DYN) && __glibc_unlikely ((mode & __RTLD_OPENEXEC) == 0)) { @@ -1209,9 +1213,11 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd, elf_get_dynamic_info (l, NULL); /* Make sure we are not dlopen'ing an object that has the - DF_1_NOOPEN flag set. */ - if (__glibc_unlikely (l->l_flags_1 & DF_1_NOOPEN) - && (mode & __RTLD_DLOPEN)) + DF_1_NOOPEN flag set, or a PIE object. */ + if ((__glibc_unlikely (l->l_flags_1 & DF_1_NOOPEN) + && (mode & __RTLD_DLOPEN)) + || (__glibc_unlikely (l->l_flags_1 & DF_1_PIE) + && __glibc_unlikely ((mode & __RTLD_OPENEXEC) == 0))) { /* We are not supposed to load this object. Free all resources. */ _dl_unmap_segments (l); @@ -1222,7 +1228,11 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd, if (l->l_phdr_allocated) free ((void *) l->l_phdr); - errstring = N_("shared object cannot be dlopen()ed"); + if (l->l_flags_1 & DF_1_PIE) + errstring + = N_("cannot dynamically load position-independent executable"); + else + errstring = N_("shared object cannot be dlopen()ed"); goto call_lose; } diff --git a/include/elf.h b/include/elf.h index ab76aafb1e..14ed67ff67 100644 --- a/include/elf.h +++ b/include/elf.h @@ -23,7 +23,7 @@ # endif # define DT_1_SUPPORTED_MASK \ (DF_1_NOW | DF_1_NODELETE | DF_1_INITFIRST | DF_1_NOOPEN \ - | DF_1_ORIGIN | DF_1_NODEFLIB) + | DF_1_ORIGIN | DF_1_NODEFLIB | DF_1_PIE) #endif /* !_ISOMAC */ #endif /* elf.h */ |