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arm: Use "nr" constraint for Systemtap probes [BZ #24164]
With the default "nor" constraint, current GCC will use the "o"
constraint for constants, after emitting the constant to memory. That
results in unparseable Systemtap probe notes such as "-4@.L1052".
Removing the "o" alternative and using "nr" instead avoids this.
(cherry picked from commit f1ac745583
)
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11
ChangeLog
11
ChangeLog
@ -1,3 +1,14 @@
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2019-02-05 Florian Weimer <fweimer@redhat.com>
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[BZ #24164]
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arm: Use "nr" constraint for Systemtap probes, to avoid the
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compiler using memory operands for constants, due to the "o"
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alternative in the default "nor" constraint.
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* include/stap-probe.h [USE_STAP_PROBE]: Include
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<stap-probe-machine.h>
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* sysdeps/generic/stap-probe-machine.h: New file.
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* sysdeps/arm/stap-probe-machine.h: Likewise.
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2019-02-04 H.J. Lu <hongjiu.lu@intel.com>
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[BZ #24155]
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1
NEWS
1
NEWS
@ -10,6 +10,7 @@ Version 2.29.1
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The following bugs are resolved with this release:
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[24155] x32 memcmp can treat positive length as 0 (if sign bit in RDX is set) (CVE-2019-7309)
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[24164] Systemtap probes need to use "nr" constraint on 32-bit Arm
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Security related changes:
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@ -21,6 +21,7 @@
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#ifdef USE_STAP_PROBE
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# include <stap-probe-machine.h>
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# include <sys/sdt.h>
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/* Our code uses one macro LIBC_PROBE (name, n, arg1, ..., argn).
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22
sysdeps/arm/stap-probe-machine.h
Normal file
22
sysdeps/arm/stap-probe-machine.h
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/* Macros for customizing Systemtap <sys/sdt.h>. Arm version.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* The default "nor" constraint produces unparseable memory references
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for constants. Omit the problematic "o" constraint. See bug 24164
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and GCC PR 89146. */
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#define STAP_SDT_ARG_CONSTRAINT nr
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19
sysdeps/generic/stap-probe-machine.h
Normal file
19
sysdeps/generic/stap-probe-machine.h
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@ -0,0 +1,19 @@
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/* Macros for customizing Systemtap <sys/sdt.h>. Generic version.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* By default, there are no customizations. */
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