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libio: Disable vtable validation in case of interposition [BZ #23313]

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(cherry picked from commit c402355dfa)
This commit is contained in:
Florian Weimer 2018-07-03 15:54:49 +02:00
parent 4476d16b03
commit 3bb7482574
3 changed files with 22 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-06-26 Florian Weimer <fweimer@redhat.com>
[BZ #23313]
* libio/vtables.c (check_stdfiles_vtables): New ELF constructor.
2018-06-29 Daniel Alvarez <dalvarez@redhat.com>
Jakub Sitnicki <jkbs@redhat.com>

1
NEWS
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@ -81,6 +81,7 @@ The following bugs are resolved with this release:
[23236] Harden function pointers in _IO_str_fields
[23259] Unsubstituted ${ORIGIN} remains in DT_NEEDED for AT_SECURE
[23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
[23313] libio: Disable vtable validation in case of interposition
[23349] Various glibc headers no longer compatible with <linux/time.h>

16
libio/vtables.c
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@ -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