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glibc/gmon/Makefile
Simon Kissane bde1218720 gmon: fix memory corruption issues [BZ# 30101] 
V2 of this patch fixes an issue in V1, where the state was changed to ON not
OFF at end of _mcleanup. I hadn't noticed that (counterintuitively) ON=0 and
OFF=3, hence zeroing the buffer turned it back on. So set the state to OFF
after the memset.

1. Prevent double free, and reads from unallocated memory, when
   _mcleanup is (incorrectly) called two or more times in a row,
   without an intervening call to __monstartup; with this patch, the
   second and subsequent calls effectively become no-ops instead.
   While setting tos=NULL is minimal fix, safest action is to zero the
   whole gmonparam buffer.

2. Prevent memory leak when __monstartup is (incorrectly) called two
   or more times in a row, without an intervening call to _mcleanup;
   with this patch, the second and subsequent calls effectively become
   no-ops instead.

3. After _mcleanup, treat __moncontrol(1) as __moncontrol(0) instead.
   With zeroing of gmonparam buffer in _mcleanup, this stops the
   state incorrectly being changed to GMON_PROF_ON despite profiling
   actually being off. If we'd just done the minimal fix to _mcleanup
   of setting tos=NULL, there is risk of far worse memory corruption:
   kcount would point to deallocated memory, and the __profil syscall
   would make the kernel write profiling data into that memory,
   which could have since been reallocated to something unrelated.

4. Ensure __moncontrol(0) still turns off profiling even in error
   state. Otherwise, if mcount overflows and sets state to
   GMON_PROF_ERROR, when _mcleanup calls __moncontrol(0), the __profil
   syscall to disable profiling will not be invoked. _mcleanup will
   free the buffer, but the kernel will still be writing profiling
   data into it, potentially corrupted arbitrary memory.

Also adds a test case for (1). Issues (2)-(4) are not feasible to test.

Signed-off-by: Simon Kissane <skissane@gmail.com>
Reviewed-by: DJ Delorie <dj@redhat.com>
2023-02-22 21:03:30 -05:00

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Makefile
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# Copyright (C) 1995-2023 Free Software Foundation, Inc.
# Copyright The GNU Toolchain Authors.
# 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/>.
#
# Sub-makefile for gmon portion of the library.
#
subdir := gmon
include ../Makeconfig
headers := sys/gmon.h sys/gmon_out.h sys/profil.h
routines := gmon mcount profil sprofil prof-freq
tests = tst-sprofil tst-gmon tst-mcount-overflow tst-mcleanup
ifeq ($(build-profile),yes)
tests += tst-profile-static
tests-static += tst-profile-static
LDFLAGS-tst-profile-static = -profile
endif
tests += tst-gmon-static
tests-static += tst-gmon-static
ifeq (yesyes,$(have-fpie)$(build-shared))
tests += tst-gmon-pie
tests-pie += tst-gmon-pie
ifeq (yes,$(enable-static-pie))
tests += tst-gmon-static-pie
tests-static += tst-gmon-static-pie
endif
endif
# The mcount code won't work without a frame pointer.
CFLAGS-mcount.c := -fno-omit-frame-pointer
CFLAGS-tst-gmon.c := -fno-omit-frame-pointer -pg
tst-gmon-no-pie = yes
CRT-tst-gmon := $(csu-objpfx)g$(start-installed-name)
tst-gmon-ENV := GMON_OUT_PREFIX=$(objpfx)tst-gmon.data
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-gmon-gprof.out
endif
CFLAGS-tst-mcount-overflow.c := -fno-omit-frame-pointer -pg
tst-mcount-overflow-no-pie = yes
CRT-tst-mcount-overflow := $(csu-objpfx)g$(start-installed-name)
# Intentionally use invalid config where maxarcs<minarcs to check warning is printed
tst-mcount-overflow-ENV := GMON_OUT_PREFIX=$(objpfx)tst-mcount-overflow.data \
GLIBC_TUNABLES=glibc.gmon.minarcs=51:glibc.gmon.maxarcs=50
# Send stderr into output file because we make sure expected messages are printed
tst-mcount-overflow-ARGS := 2>&1 1>/dev/null | cat
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-mcount-overflow-check.out
endif
CFLAGS-tst-mcleanup.c := -fno-omit-frame-pointer -pg
tst-mcleanup-no-pie = yes
CRT-tst-mcleanup := $(csu-objpfx)g$(start-installed-name)
tst-mcleanup-ENV := GMON_OUT_PREFIX=$(objpfx)tst-mcleanup.data
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-mcleanup.out
endif
CFLAGS-tst-gmon-static.c := $(PIE-ccflag) -fno-omit-frame-pointer -pg
CRT-tst-gmon-static := $(csu-objpfx)g$(static-start-installed-name)
tst-gmon-static-no-pie = yes
tst-gmon-static-ENV := GMON_OUT_PREFIX=$(objpfx)tst-gmon-static.data
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-gmon-static-gprof.out
endif
CFLAGS-tst-gmon-pie.c := $(PIE-ccflag) -fno-omit-frame-pointer -pg
CRT-tst-gmon-pie := $(csu-objpfx)g$(start-installed-name)
tst-gmon-pie-ENV := GMON_OUT_PREFIX=$(objpfx)tst-gmon-pie.data
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-gmon-pie-gprof.out
endif
ifeq (yes,$(enable-static-pie))
CFLAGS-tst-gmon-static-pie.c := $(PIE-ccflag) -fno-omit-frame-pointer -pg
CRT-tst-gmon-static-pie := $(csu-objpfx)gr$(static-start-installed-name)
tst-gmon-static-pie-ENV := GMON_OUT_PREFIX=$(objpfx)tst-gmon-static-pie.data
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-gmon-static-pie-gprof.out
endif
endif
include ../Rules
# We cannot compile mcount.c with -pg because that would
# create recursive calls. Just copy the normal static object.
# On systems where `profil' is not a system call, the same
# problem exists for the internal functions in profil.c.
noprof := mcount $(sysdep_noprof)
ifeq (,$(filter profil,$(unix-syscalls)))
noprof += profil sprofil
endif
$(noprof:%=$(objpfx)%.op): %.op: %.o
rm -f $@
ln $< $@
# GMON_OUTPUT_PREFIX only sets the output prefix. The actual file
# name contains the PID as well.
$(objpfx)tst-gmon.out: clean-tst-gmon-data
clean-tst-gmon-data:
rm -f $(objpfx)tst-gmon.data.*
$(objpfx)tst-mcount-overflow.o: clean-tst-mcount-overflow-data
clean-tst-mcount-overflow-data:
rm -f $(objpfx)tst-mcount-overflow.data.*
$(objpfx)tst-mcount-overflow-check.out: tst-mcount-overflow-check.sh $(objpfx)tst-mcount-overflow.out
$(SHELL) $< $(objpfx)tst-mcount-overflow > $@; \
$(evaluate-test)
$(objpfx)tst-mcleanup.out: clean-tst-mcleanup-data
clean-tst-mcleanup-data:
rm -f $(objpfx)tst-mcleanup.data.*
$(objpfx)tst-gmon-gprof.out: tst-gmon-gprof.sh $(objpfx)tst-gmon.out
$(SHELL) $< $(GPROF) $(objpfx)tst-gmon $(objpfx)tst-gmon.data.* > $@; \
$(evaluate-test)
$(objpfx)tst-gmon-static.out: clean-tst-gmon-static-data
clean-tst-gmon-static-data:
rm -f $(objpfx)tst-gmon-static.data.*
$(objpfx)tst-gmon-static-gprof.out: tst-gmon-static-gprof.sh \
$(objpfx)tst-gmon-static.out
$(SHELL) $< $(GPROF) $(objpfx)tst-gmon-static \
$(objpfx)tst-gmon-static.data.* > $@; \
$(evaluate-test)
$(objpfx)tst-gmon-pie.out: clean-tst-gmon-pie-data
clean-tst-gmon-pie-data:
rm -f $(objpfx)tst-gmon-pie.data.*
$(objpfx)tst-gmon-pie-gprof.out: tst-gmon-gprof.sh $(objpfx)tst-gmon-pie.out
$(SHELL) $< $(GPROF) $(objpfx)tst-gmon-pie $(objpfx)tst-gmon-pie.data.* > $@; \
$(evaluate-test)
$(objpfx)tst-gmon-static-pie.out: clean-tst-gmon-static-pie-data
clean-tst-gmon-static-pie-data:
rm -f $(objpfx)tst-gmon-static-pie.data.*
$(objpfx)tst-gmon-static-pie-gprof.out: tst-gmon-static-gprof.sh \
$(objpfx)tst-gmon-static-pie.out
$(SHELL) $< $(GPROF) $(objpfx)tst-gmon-static-pie \
$(objpfx)tst-gmon-static-pie.data.* > $@; \
$(evaluate-test)
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