478 lines
17 KiB
Diff
478 lines
17 KiB
Diff
This patch adds the required @order directives to preserve the
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GLIBC_PRIVATE ABI.
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commit 31be941e4367c001b2009308839db5c67bf9dcbc
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Author: Simon Kissane <skissane@gmail.com>
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Date: Sat Feb 11 20:12:13 2023 +1100
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gmon: improve mcount overflow handling [BZ# 27576]
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When mcount overflows, no gmon.out file is generated, but no message is printed
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to the user, leaving the user with no idea why, and thinking maybe there is
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some bug - which is how BZ 27576 ended up being logged. Print a message to
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stderr in this case so the user knows what is going on.
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As a comment in sys/gmon.h acknowledges, the hardcoded MAXARCS value is too
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small for some large applications, including the test case in that BZ. Rather
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than increase it, add tunables to enable MINARCS and MAXARCS to be overridden
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at runtime (glibc.gmon.minarcs and glibc.gmon.maxarcs). So if a user gets the
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mcount overflow error, they can try increasing maxarcs (they might need to
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increase minarcs too if the heuristic is wrong in their case.)
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Note setting minarcs/maxarcs too large can cause monstartup to fail with an
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out of memory error. If you set them large enough, it can cause an integer
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overflow in calculating the buffer size. I haven't done anything to defend
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against that - it would not generally be a security vulnerability, since these
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tunables will be ignored in suid/sgid programs (due to the SXID_ERASE default),
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and if you can set GLIBC_TUNABLES in the environment of a process, you can take
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it over anyway (LD_PRELOAD, LD_LIBRARY_PATH, etc). I thought about modifying
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the code of monstartup to defend against integer overflows, but doing so is
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complicated, and I realise the existing code is susceptible to them even prior
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to this change (e.g. try passing a pathologically large highpc argument to
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monstartup), so I decided just to leave that possibility in-place.
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Add a test case which demonstrates mcount overflow and the tunables.
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Document the new tunables in the manual.
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Signed-off-by: Simon Kissane <skissane@gmail.com>
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Reviewed-by: DJ Delorie <dj@redhat.com>
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Conflicts:
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manual/tunables.texi
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(missing tunables downstream)
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diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list
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index f11ca5b3e8b09b43..dc2999796042dbaf 100644
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--- a/elf/dl-tunables.list
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+++ b/elf/dl-tunables.list
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@@ -149,4 +149,17 @@ glibc {
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default: 2
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}
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}
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+
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+ gmon {
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+ minarcs {
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+ type: INT_32
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+ minval: 50
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+ default: 50
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+ }
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+ maxarcs {
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+ type: INT_32
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+ minval: 50
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+ default: 1048576
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+ }
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+ }
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}
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diff --git a/gmon/Makefile b/gmon/Makefile
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index d94593c9d8a882eb..54f05894d4dd8c4a 100644
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--- a/gmon/Makefile
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+++ b/gmon/Makefile
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@@ -25,7 +25,7 @@ include ../Makeconfig
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headers := sys/gmon.h sys/gmon_out.h sys/profil.h
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routines := gmon mcount profil sprofil prof-freq
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-tests = tst-sprofil tst-gmon
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+tests = tst-sprofil tst-gmon tst-mcount-overflow
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ifeq ($(build-profile),yes)
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tests += tst-profile-static
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tests-static += tst-profile-static
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@@ -56,6 +56,18 @@ ifeq ($(run-built-tests),yes)
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tests-special += $(objpfx)tst-gmon-gprof.out
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endif
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+CFLAGS-tst-mcount-overflow.c := -fno-omit-frame-pointer -pg
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+tst-mcount-overflow-no-pie = yes
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+CRT-tst-mcount-overflow := $(csu-objpfx)g$(start-installed-name)
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+# Intentionally use invalid config where maxarcs<minarcs to check warning is printed
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+tst-mcount-overflow-ENV := GMON_OUT_PREFIX=$(objpfx)tst-mcount-overflow.data \
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+ GLIBC_TUNABLES=glibc.gmon.minarcs=51:glibc.gmon.maxarcs=50
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+# Send stderr into output file because we make sure expected messages are printed
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+tst-mcount-overflow-ARGS := 2>&1 1>/dev/null | cat
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+ifeq ($(run-built-tests),yes)
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+tests-special += $(objpfx)tst-mcount-overflow-check.out
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+endif
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+
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CFLAGS-tst-gmon-static.c := $(PIE-ccflag) -fno-omit-frame-pointer -pg
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CRT-tst-gmon-static := $(csu-objpfx)gcrt1.o
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tst-gmon-static-no-pie = yes
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@@ -103,6 +115,14 @@ $(objpfx)tst-gmon.out: clean-tst-gmon-data
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clean-tst-gmon-data:
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rm -f $(objpfx)tst-gmon.data.*
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+$(objpfx)tst-mcount-overflow.o: clean-tst-mcount-overflow-data
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+clean-tst-mcount-overflow-data:
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+ rm -f $(objpfx)tst-mcount-overflow.data.*
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+
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+$(objpfx)tst-mcount-overflow-check.out: tst-mcount-overflow-check.sh $(objpfx)tst-mcount-overflow.out
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+ $(SHELL) $< $(objpfx)tst-mcount-overflow > $@; \
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+ $(evaluate-test)
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+
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$(objpfx)tst-gmon-gprof.out: tst-gmon-gprof.sh $(objpfx)tst-gmon.out
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$(SHELL) $< $(GPROF) $(objpfx)tst-gmon $(objpfx)tst-gmon.data.* > $@; \
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$(evaluate-test)
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diff --git a/gmon/gmon.c b/gmon/gmon.c
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index bf76358d5b1aa2da..689bf80141e559ca 100644
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--- a/gmon/gmon.c
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+++ b/gmon/gmon.c
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@@ -46,6 +46,11 @@
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#include <libc-internal.h>
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#include <not-cancel.h>
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+#if HAVE_TUNABLES
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+# define TUNABLE_NAMESPACE gmon
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+# include <elf/dl-tunables.h>
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+#endif
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+
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#ifdef PIC
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# include <link.h>
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@@ -124,6 +129,22 @@ __monstartup (u_long lowpc, u_long highpc)
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int o;
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char *cp;
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struct gmonparam *p = &_gmonparam;
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+ long int minarcs, maxarcs;
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+
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+#if HAVE_TUNABLES
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+ /* Read minarcs/maxarcs tunables. */
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+ minarcs = TUNABLE_GET (minarcs, int32_t, NULL);
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+ maxarcs = TUNABLE_GET (maxarcs, int32_t, NULL);
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+ if (maxarcs < minarcs)
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+ {
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+ ERR("monstartup: maxarcs < minarcs, setting maxarcs = minarcs\n");
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+ maxarcs = minarcs;
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+ }
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+#else
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+ /* No tunables, we use hardcoded defaults */
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+ minarcs = MINARCS;
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+ maxarcs = MAXARCS;
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+#endif
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/*
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* round lowpc and highpc to multiples of the density we're using
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@@ -146,10 +167,10 @@ __monstartup (u_long lowpc, u_long highpc)
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}
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p->fromssize = ROUNDUP(p->textsize / HASHFRACTION, sizeof(*p->froms));
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p->tolimit = p->textsize * ARCDENSITY / 100;
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- if (p->tolimit < MINARCS)
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- p->tolimit = MINARCS;
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- else if (p->tolimit > MAXARCS)
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- p->tolimit = MAXARCS;
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+ if (p->tolimit < minarcs)
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+ p->tolimit = minarcs;
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+ else if (p->tolimit > maxarcs)
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+ p->tolimit = maxarcs;
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p->tossize = p->tolimit * sizeof(struct tostruct);
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cp = calloc (p->kcountsize + p->fromssize + p->tossize, 1);
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diff --git a/gmon/mcount.c b/gmon/mcount.c
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index 9d4a1a50fa6ab21a..f7180fdb83399a14 100644
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--- a/gmon/mcount.c
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+++ b/gmon/mcount.c
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@@ -41,6 +41,10 @@ static char sccsid[] = "@(#)mcount.c 8.1 (Berkeley) 6/4/93";
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#include <atomic.h>
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+#include <not-cancel.h>
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+#include <unistd.h>
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+#define ERR(s) __write_nocancel (STDERR_FILENO, s, sizeof (s) - 1)
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+
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/*
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* mcount is called on entry to each function compiled with the profiling
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* switch set. _mcount(), which is declared in a machine-dependent way
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@@ -170,6 +174,7 @@ done:
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return;
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overflow:
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p->state = GMON_PROF_ERROR;
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+ ERR("mcount: call graph buffer size limit exceeded, gmon.out will not be generated\n");
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return;
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}
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diff --git a/gmon/sys/gmon.h b/gmon/sys/gmon.h
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index b4cc3b043a2aec77..af0582a3717085b5 100644
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--- a/gmon/sys/gmon.h
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+++ b/gmon/sys/gmon.h
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@@ -111,6 +111,8 @@ extern struct __bb *__bb_head;
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* Always allocate at least this many tostructs. This
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* hides the inadequacy of the ARCDENSITY heuristic, at least
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* for small programs.
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+ *
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+ * Value can be overridden at runtime by glibc.gmon.minarcs tunable.
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*/
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#define MINARCS 50
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@@ -124,8 +126,8 @@ extern struct __bb *__bb_head;
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* Used to be max representable value of ARCINDEX minus 2, but now
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* that ARCINDEX is a long, that's too large; we don't really want
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* to allow a 48 gigabyte table.
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- * The old value of 1<<16 wasn't high enough in practice for large C++
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- * programs; will 1<<20 be adequate for long? FIXME
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+ *
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+ * Value can be overridden at runtime by glibc.gmon.maxarcs tunable.
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*/
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#define MAXARCS (1 << 20)
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diff --git a/gmon/tst-mcount-overflow-check.sh b/gmon/tst-mcount-overflow-check.sh
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new file mode 100644
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index 0000000000000000..27eb5538fd573a6e
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--- /dev/null
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+++ b/gmon/tst-mcount-overflow-check.sh
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@@ -0,0 +1,45 @@
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+#!/bin/sh
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+# Test expected messages generated when mcount overflows
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+# Copyright (C) 2017-2023 Free Software Foundation, Inc.
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+# Copyright The GNU Toolchain Authors.
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+# This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+# <https://www.gnu.org/licenses/>.
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+
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+LC_ALL=C
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+export LC_ALL
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+set -e
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+exec 2>&1
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+
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+program="$1"
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+
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+check_msg() {
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+ if ! grep -q "$1" "$program.out"; then
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+ echo "FAIL: expected message not in output: $1"
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+ exit 1
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+ fi
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+}
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+
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+check_msg 'monstartup: maxarcs < minarcs, setting maxarcs = minarcs'
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+check_msg 'mcount: call graph buffer size limit exceeded, gmon.out will not be generated'
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+
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+for data_file in $1.data.*; do
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+ if [ -f "$data_file" ]; then
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+ echo "FAIL: expected no data files, but found $data_file"
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+ exit 1
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+ fi
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+done
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+
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+echo PASS
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diff --git a/gmon/tst-mcount-overflow.c b/gmon/tst-mcount-overflow.c
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new file mode 100644
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index 0000000000000000..06cc93ef872eb7c1
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--- /dev/null
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+++ b/gmon/tst-mcount-overflow.c
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@@ -0,0 +1,72 @@
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+/* Test program to trigger mcount overflow in profiling collection.
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+ Copyright (C) 2017-2023 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+ <https://www.gnu.org/licenses/>. */
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+
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+/* Program with sufficiently complex, yet pointless, call graph
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+ that it will trigger an mcount overflow, when you set the
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+ minarcs/maxarcs tunables to very low values. */
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+
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+#define PREVENT_TAIL_CALL asm volatile ("")
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+
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+/* Calls REP(n) macro 16 times, for n=0..15.
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+ * You need to define REP(n) before using this.
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+ */
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+#define REPS \
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+ REP(0) REP(1) REP(2) REP(3) REP(4) REP(5) REP(6) REP(7) \
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+ REP(8) REP(9) REP(10) REP(11) REP(12) REP(13) REP(14) REP(15)
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+
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+/* Defines 16 leaf functions named f1_0 to f1_15 */
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+#define REP(n) \
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+ __attribute__ ((noinline, noclone, weak)) void f1_##n (void) {};
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+REPS
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+#undef REP
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+
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+/* Calls all 16 leaf functions f1_* in succession */
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+__attribute__ ((noinline, noclone, weak)) void
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+f2 (void)
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+{
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+# define REP(n) f1_##n();
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+ REPS
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+# undef REP
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+ PREVENT_TAIL_CALL;
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+}
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+
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+/* Defines 16 functions named f2_0 to f2_15, which all just call f2 */
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+#define REP(n) \
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+ __attribute__ ((noinline, noclone, weak)) void \
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+ f2_##n (void) { f2(); PREVENT_TAIL_CALL; };
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+REPS
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+#undef REP
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+
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+__attribute__ ((noinline, noclone, weak)) void
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+f3 (int count)
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+{
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+ for (int i = 0; i < count; ++i)
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+ {
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+ /* Calls f1_0(), f2_0(), f1_1(), f2_1(), f3_0(), etc */
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+# define REP(n) f1_##n(); f2_##n();
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+ REPS
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+# undef REP
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+ }
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+}
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+
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+int
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+main (void)
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+{
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+ f3 (1000);
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+ return 0;
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+}
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diff --git a/manual/tunables.texi b/manual/tunables.texi
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index 7b70e80391ee87f7..00eafcf44b562b9e 100644
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--- a/manual/tunables.texi
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+++ b/manual/tunables.texi
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@@ -73,6 +73,9 @@ glibc.malloc.check: 0 (min: 0, max: 3)
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* Elision Tunables:: Tunables in elision subsystem
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* Hardware Capability Tunables:: Tunables that modify the hardware
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capabilities seen by @theglibc{}
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+* gmon Tunables:: Tunables that control the gmon profiler, used in
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+ conjunction with gprof
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+
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@end menu
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@node Tunable names
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@@ -506,3 +509,59 @@ instead.
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This tunable is specific to i386 and x86-64.
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@end deftp
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+
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+@node gmon Tunables
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+@section gmon Tunables
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+@cindex gmon tunables
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+
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+@deftp {Tunable namespace} glibc.gmon
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+This tunable namespace affects the behaviour of the gmon profiler.
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+gmon is a component of @theglibc{} which is normally used in
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+conjunction with gprof.
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+
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+When GCC compiles a program with the @code{-pg} option, it instruments
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+the program with calls to the @code{mcount} function, to record the
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+program's call graph. At program startup, a memory buffer is allocated
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+to store this call graph; the size of the buffer is calculated using a
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+heuristic based on code size. If during execution, the buffer is found
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+to be too small, profiling will be aborted and no @file{gmon.out} file
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+will be produced. In that case, you will see the following message
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+printed to standard error:
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+
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+@example
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+mcount: call graph buffer size limit exceeded, gmon.out will not be generated
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+@end example
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+
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+Most of the symbols discussed in this section are defined in the header
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+@code{sys/gmon.h}. However, some symbols (for example @code{mcount})
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+are not defined in any header file, since they are only intended to be
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+called from code generated by the compiler.
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+@end deftp
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+
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+@deftp Tunable glibc.mem.minarcs
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+The heuristic for sizing the call graph buffer is known to be
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+insufficient for small programs; hence, the calculated value is clamped
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+to be at least a minimum size. The default minimum (in units of
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+call graph entries, @code{struct tostruct}), is given by the macro
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+@code{MINARCS}. If you have some program with an unusually complex
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+call graph, for which the heuristic fails to allocate enough space,
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+you can use this tunable to increase the minimum to a larger value.
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+@end deftp
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+
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+@deftp Tunable glibc.mem.maxarcs
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+To prevent excessive memory consumption when profiling very large
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+programs, the call graph buffer is allowed to have a maximum of
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+@code{MAXARCS} entries. For some very large programs, the default
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+value of @code{MAXARCS} defined in @file{sys/gmon.h} is too small; in
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+that case, you can use this tunable to increase it.
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+
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+Note the value of the @code{maxarcs} tunable must be greater or equal
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+to that of the @code{minarcs} tunable; if this constraint is violated,
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+a warning will printed to standard error at program startup, and
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+the @code{minarcs} value will be used as the maximum as well.
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+
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+Setting either tunable too high may result in a call graph buffer
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+whose size exceeds the available memory; in that case, an out of memory
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+error will be printed at program startup, the profiler will be
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+disabled, and no @file{gmon.out} file will be generated.
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+@end deftp
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diff --git a/sysdeps/unix/sysv/linux/aarch64/dl-tunables.list b/sysdeps/unix/sysv/linux/aarch64/dl-tunables.list
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index 5c3c5292025607a1..265f82ef2be42fd0 100644
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--- a/sysdeps/unix/sysv/linux/aarch64/dl-tunables.list
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|
+++ b/sysdeps/unix/sysv/linux/aarch64/dl-tunables.list
|
|
@@ -24,3 +24,7 @@
|
|
|
|
# Tunables added in RHEL 8.8.0
|
|
@order glibc.rtld.dynamic_sort
|
|
+
|
|
+# Tunables added in RHEL 8.9.0
|
|
+@order glibc.gmon.minarcs
|
|
+@order glibc.gmon.maxarcs
|
|
diff --git a/sysdeps/unix/sysv/linux/i386/dl-tunables.list b/sysdeps/unix/sysv/linux/i386/dl-tunables.list
|
|
index b9cad4af62d9f2e5..9c1ccb86501c61e7 100644
|
|
--- a/sysdeps/unix/sysv/linux/i386/dl-tunables.list
|
|
+++ b/sysdeps/unix/sysv/linux/i386/dl-tunables.list
|
|
@@ -31,3 +31,7 @@
|
|
|
|
# Tunables added in RHEL 8.8.0
|
|
@order glibc.rtld.dynamic_sort
|
|
+
|
|
+# Tunables added in RHEL 8.9.0
|
|
+@order glibc.gmon.minarcs
|
|
+@order glibc.gmon.maxarcs
|
|
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/dl-tunables.list b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/dl-tunables.list
|
|
index ee1e6fca95e1f2da..c8bb1a8ec0283ac8 100644
|
|
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/dl-tunables.list
|
|
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/dl-tunables.list
|
|
@@ -24,3 +24,7 @@
|
|
|
|
# Tunables added in RHEL 8.8.0
|
|
@order glibc.rtld.dynamic_sort
|
|
+
|
|
+# Tunables added in RHEL 8.9.0
|
|
+@order glibc.gmon.minarcs
|
|
+@order glibc.gmon.maxarcs
|
|
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/dl-tunables.list b/sysdeps/unix/sysv/linux/s390/s390-64/dl-tunables.list
|
|
index 099e28d8f8e67944..85b3a014ffcadc45 100644
|
|
--- a/sysdeps/unix/sysv/linux/s390/s390-64/dl-tunables.list
|
|
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/dl-tunables.list
|
|
@@ -23,3 +23,7 @@
|
|
|
|
# Tunables added in RHEL 8.8.0
|
|
@order glibc.rtld.dynamic_sort
|
|
+
|
|
+# Tunables added in RHEL 8.9.0
|
|
+@order glibc.gmon.minarcs
|
|
+@order glibc.gmon.maxarcs
|
|
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/dl-tunables.list b/sysdeps/unix/sysv/linux/x86_64/64/dl-tunables.list
|
|
index b9cad4af62d9f2e5..9c1ccb86501c61e7 100644
|
|
--- a/sysdeps/unix/sysv/linux/x86_64/64/dl-tunables.list
|
|
+++ b/sysdeps/unix/sysv/linux/x86_64/64/dl-tunables.list
|
|
@@ -31,3 +31,7 @@
|
|
|
|
# Tunables added in RHEL 8.8.0
|
|
@order glibc.rtld.dynamic_sort
|
|
+
|
|
+# Tunables added in RHEL 8.9.0
|
|
+@order glibc.gmon.minarcs
|
|
+@order glibc.gmon.maxarcs
|