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elf: Do not run IFUNC resolvers for LD_DEBUG=unused [BZ #24214]

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This commit adds missing skip_ifunc checks to aarch64, arm, i386,
sparc, and x86_64.  A new test case ensures that IRELATIVE IFUNC
resolvers do not run in various diagnostic modes of the dynamic
loader.

Reviewed-By: Szabolcs Nagy <szabolcs.nagy@arm.com>
This commit is contained in:
Florian Weimer
2019-11-29 17:55:22 +01:00
parent 61a7c9df71
commit 4db71d2f98
9 changed files with 114 additions and 10 deletions
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57
elf/tst-ifunc-fault-lazy.c Normal file
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/* Program with local IFUNC resolver which crashes, for testing bug 24214.
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
<https://www.gnu.org/licenses/>. */
/* The construct below is expected to produce an IRELATIVE relocation
with an IFUNC resolver that crashes. ldd should not performs such
relocations. */
#include <config.h>
#ifdef HAVE_GCC_IFUNC
# include <stddef.h>
static void
implementation (void)
{
/* Produce a crash, without depending on any relocations. */
volatile char *volatile p = NULL;
*p = 0;
}
static __typeof__ (implementation) *
resolver (void)
{
/* Produce a crash, without depending on any relocations. */
volatile char *volatile p = NULL;
*p = 0;
return implementation;
}
static void magic (void) __attribute__ ((ifunc ("resolver")));
void (*magic_ptr) (void) = magic;
#endif /* HAVE_GCC_IFUNC */
/* The program is expected not to run. */
int
main (void)
{
return 1;
}