Re: perf-probe crash in dwarf_getcfi_elf

From: David Ahern
Date: Tue Dec 30 2014 - 12:13:55 EST

On 12/30/14 2:05 AM, Namhyung Kim wrote:
From f56964e74d60a9921214d0e2e5c3d082f5a910c1 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung@xxxxxxxxxx>
Date: Tue, 30 Dec 2014 17:47:47 +0900
Subject: [PATCH] perf probe: Fix a segfault on old libdw

David reported that perf can segfault when adding an uprobe event like

$ perf probe -x /lib64/ -a 'malloc size=%di'

(gdb) bt
#0 parse_eh_frame_hdr (hdr=0x0, hdr_size=2596, hdr_vaddr=71788,
ehdr=0x7fffffffd390, eh_frame_vaddr=
0x7fffffffd378, table_entries=0x8808d8, table_encoding=0x8808e0 "") at
#1 0x000000385f81615a in getcfi_scn_eh_frame (hdr_vaddr=71788,
hdr_scn=0x8839b0, shdr=0x7fffffffd2f0, scn=<optimized out>,
ehdr=0x7fffffffd390, elf=0x882b30) at dwarf_getcfi_elf.c:231
#2 getcfi_shdr (ehdr=0x7fffffffd390, elf=0x882b30) at dwarf_getcfi_elf.c:283
#3 dwarf_getcfi_elf (elf=0x882b30) at dwarf_getcfi_elf.c:309
#4 0x00000000004d5bac in debuginfo__find_probes (pf=0x7fffffffd4f0,
dbg=Unhandled dwarf expression opcode 0xfa) at util/probe-finder.c:993
#5 0x00000000004d634a in debuginfo__find_trace_events (dbg=0x880840,
pev=<optimized out>, tevs=0x880f88, max_tevs=<optimized out>) at
#6 0x00000000004aed6b in try_to_find_probe_trace_events (target=0x881b20
max_tevs=128, tevs=0x880f88, pev=0x859b30) at util/probe-event.c:482
#7 convert_to_probe_trace_events (target=0x881b20
"/lib64/", max_tevs=128, tevs=0x880f88,
pev=0x859b30) at util/probe-event.c:2356
#8 add_perf_probe_events (pevs=<optimized out>, npevs=1, max_tevs=128,
target=0x881b20 "/lib64/", force_add=false) at
#9 0x000000000044014f in __cmd_probe (argc=<optimized out>,
argv=0x7fffffffe2f0, prefix=Unhandled dwarf expression opcode 0xfa) at
at builtin-probe.c:488
#10 0x0000000000440313 in cmd_probe (argc=5, argv=0x7fffffffe2f0,
prefix=<optimized out>) at builtin-probe.c:506
#11 0x000000000041d133 in run_builtin (p=0x805680, argc=5,
argv=0x7fffffffe2f0) at perf.c:341
#12 0x000000000041c8b2 in handle_internal_command (argv=<optimized out>,
argc=<optimized out>) at perf.c:400
#13 run_argv (argv=<optimized out>, argcp=<optimized out>) at perf.c:444
#14 main (argc=5, argv=0x7fffffffe2f0) at perf.c:559

And I found a related commit (5704c8c4fa71 "getcfi_scn_eh_frame: Don't
crash and burn when .eh_frame bits aren't there.") in elfutils that
can lead to a unexpected crash like this. To safely use the function,
it needs to check the .eh_frame section is a PROGBITS type.

Reported-by: David Ahern <dsahern@xxxxxxxxx>
Cc: Mark Wielaard <mjw@xxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>

Solves the crash for me.

Tested-by: David Ahern <dsahern@xxxxxxxxx>

Thanks for the quick response, Namhyung.

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