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| author | Florian Weimer <fweimer@redhat.com> | 2018-06-26 10:24:52 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2019-11-28 16:21:26 +0100 |
| commit | 8440c51d8981e8e40d611a2cbf9850091e7d5a72 (patch) | |
| tree | 69db74157d20169b01a52a93834a306a0e658fbc | |
| parent | e73ac9ce9098d36699231b435168a0a904500ed9 (diff) | |
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libio: Disable vtable validation in case of interposition [BZ #23313]
(cherry picked from commit c402355dfa7807b8e0adb27c009135a7e2b9f1b0)
| -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. + 2019-11-01 Dragan Mladjenovic <dmladjenovic@wavecomp.com> * sysdeps/unix/sysv/linux/mips/Makefile diff --git a/libio/vtables.c b/libio/vtables.c index 41b48db98c..a11226ab17 100644 --- a/libio/vtables.c +++ b/libio/vtables.c @@ -70,3 +70,19 @@ _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 |