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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-01-23 11:42:54 -0200 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-01-24 09:38:43 -0200 |
commit | 8e889c5da3c5981c5a46a93fec02de40131ac5a6 (patch) | |
tree | b820f0d6553d8d655a7a9374e2d1b654fe3d3a95 /elf/tst-audit13.c | |
parent | ee4d79026da2c21c75cccd5795cb4357643f4f5c (diff) | |
download | glibc-8e889c5da3c5981c5a46a93fec02de40131ac5a6.tar.gz glibc-8e889c5da3c5981c5a46a93fec02de40131ac5a6.tar.xz glibc-8e889c5da3c5981c5a46a93fec02de40131ac5a6.zip |
elf: Fix LD_AUDIT for modules with invalid version (BZ#24122)
The error handling patch for invalid audit modules version access invalid memory: elf/rtld.c: 1454 unsigned int (*laversion) (unsigned int); 1455 unsigned int lav; 1456 if (err_str == NULL 1457 && (laversion = largs.result) != NULL 1458 && (lav = laversion (LAV_CURRENT)) > 0 1459 && lav <= LAV_CURRENT) 1460 { [...] 1526 else 1527 { 1528 /* We cannot use the DSO, it does not have the 1529 appropriate interfaces or it expects something 1530 more recent. */ 1531 #ifndef NDEBUG 1532 Lmid_t ns = dlmargs.map->l_ns; 1533 #endif 1534 _dl_close (dlmargs.map); 1535 1536 /* Make sure the namespace has been cleared entirely. */ 1537 assert (GL(dl_ns)[ns]._ns_loaded == NULL); 1538 assert (GL(dl_ns)[ns]._ns_nloaded == 0); 1539 1540 GL(dl_tls_max_dtv_idx) = tls_idx; 1541 goto not_loaded; 1542 } 1431 const char *err_str = NULL; 1432 bool malloced; 1433 (void) _dl_catch_error (&objname, &err_str, &malloced, dlmopen_doit, 1434 &dlmargs); 1435 if (__glibc_unlikely (err_str != NULL)) 1436 { 1437 not_loaded: 1438 _dl_error_printf ("\ 1439 ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n", 1440 name, err_str); 1441 if (malloced) 1442 free ((char *) err_str); 1443 } On failure the err_str will be NULL and _dl_debug_vdprintf does not handle it properly: elf/dl-misc.c: 200 case 's': 201 /* Get the string argument. */ 202 iov[niov].iov_base = va_arg (arg, char *); 203 iov[niov].iov_len = strlen (iov[niov].iov_base); 204 if (prec != -1) 205 iov[niov].iov_len = MIN ((size_t) prec, iov[niov].iov_len); 206 ++niov; 207 break; This patch fixes the issues and improves the error message. Checked on x86_64-linux-gnu and i686-linux-gnu [BZ #24122] * elf/Makefile (tests): Add tst-audit13. (modules-names): Add tst-audit13mod1. (tst-audit13.out, LDFLAGS-tst-audit13mod1.so, tst-audit13-ENV): New rule. * elf/rtld.c (dl_main): Handle invalid audit module version. * elf/tst-audit13.c: New file. * elf/tst-audit13mod1.c: Likewise. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'elf/tst-audit13.c')
-rw-r--r-- | elf/tst-audit13.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/elf/tst-audit13.c b/elf/tst-audit13.c new file mode 100644 index 0000000000..6f587baf58 --- /dev/null +++ b/elf/tst-audit13.c @@ -0,0 +1,28 @@ +/* Check for invalid audit version (BZ#24122). + Copyright (C) 2019 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <stdio.h> + +static int +do_test (void) +{ + puts ("plt call"); + return 0; +} + +#include <support/test-driver.c> |