diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | libio/vtables.c | 16 |
2 files changed, 21 insertions, 0 deletions
@@ -1,3 +1,8 @@ +2018-06-26 Florian Weimer <fweimer@redhat.com> + + [BZ #23313] + * libio/vtables.c (check_stdfiles_vtables): New ELF constructor. + 2018-06-25 Florian Weimer <fweimer@redhat.com> [BZ #18023] diff --git a/libio/vtables.c b/libio/vtables.c index 9fd4ccf..9df7566 100644 --- a/libio/vtables.c +++ b/libio/vtables.c @@ -71,3 +71,19 @@ _IO_vtable_check (void) __libc_fatal ("Fatal error: glibc detected an invalid stdio handle\n"); } + +/* Some variants of libstdc++ interpose _IO_2_1_stdin_ etc. and + install their own vtables directly, without calling _IO_init or + other functions. Detect this by looking at the vtables values + during startup, and disable vtable validation in this case. */ +#ifdef SHARED +__attribute__ ((constructor)) +static void +check_stdfiles_vtables (void) +{ + if (_IO_2_1_stdin_.vtable != &_IO_file_jumps + || _IO_2_1_stdout_.vtable != &_IO_file_jumps + || _IO_2_1_stderr_.vtable != &_IO_file_jumps) + IO_set_accept_foreign_vtables (&_IO_vtable_check); +} +#endif |