Date: Fri, 26 Feb 2016 11:21:26 +0800 From: Howard Su <howard0su@gmail.com> To: current@freebsd.org Subject: buffer overflow warning in /bin/sh Message-ID: <CAAvnz_owSKcJ71LJa2F4MnnWKjV251CH-mBsVMFcS=riN=bK_Q@mail.gmail.com>
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I got the error when compiling GENERIC kernel with address sanitizer
/bin/sh:
--- vers.c ---
MAKE=3Dmake sh /usr/home/howardsu/freebsd/sys/conf/newvers.sh
GENERIC=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D4132=3D=3DERROR: AddressSanitizer: stack-buffer-overflow on address
0x7fffffffc9c0 at pc 0x00000045fdc7 bp 0x7fffffffc930 sp 0x7fffffffc0f0
WRITE of size 312 at 0x7fffffffc9c0 thread T0
#0 0x45fdc6 (/bin/sh+0x45fdc6)
#1 0x801431767 (/lib/libc.so.7+0x7c767)
#2 0x42ff5e (/bin/sh+0x42ff5e)
#3 0x4b6b00 (/bin/sh+0x4b6b00)
#4 0x49686e (/bin/sh+0x49686e)
#5 0x495572 (/bin/sh+0x495572)
#6 0x48c3f9 (/bin/sh+0x48c3f9)
#7 0x489920 (/bin/sh+0x489920)
#8 0x4acde8 (/bin/sh+0x4acde8)
#9 0x4aca4d (/bin/sh+0x4aca4d)
#10 0x40fb0e (/bin/sh+0x40fb0e)
#11 0x80071afff (<unknown module>)
Address 0x7fffffffc9c0 is located in stack of thread
T0=3D=3D4132=3D=3DAddressSanitizer CHECK failed:
/usr/home/howardsu/freebsd/lib/libclang_rt/asan/../../../contrib/compiler-r=
t/lib/asan/asan_thread.cc:246
"((ptr[0] =3D=3D kCurrentStackFrameMagic)) !=3D (0)" (0x0, 0x0)
#0 0x422b9d (/bin/sh+0x422b9d)
#1 0x41de09 (/bin/sh+0x41de09)
#2 0x41f301 (/bin/sh+0x41f301)
#3 0x4728be (/bin/sh+0x4728be)
#4 0x474589 (/bin/sh+0x474589)
#5 0x47502a (/bin/sh+0x47502a)
#6 0x45fdef (/bin/sh+0x45fdef)
#7 0x801431767 (/lib/libc.so.7+0x7c767)
#8 0x42ff5e (/bin/sh+0x42ff5e)
#9 0x4b6b00 (/bin/sh+0x4b6b00)
#10 0x49686e (/bin/sh+0x49686e)
#11 0x495572 (/bin/sh+0x495572)
#12 0x48c3f9 (/bin/sh+0x48c3f9)
#13 0x489920 (/bin/sh+0x489920)
#14 0x4acde8 (/bin/sh+0x4acde8)
#15 0x4aca4d (/bin/sh+0x4aca4d)
#16 0x40fb0e (/bin/sh+0x40fb0e)
#17 0x80071afff (<unknown module>)
*** [vers.c] Error code 1
I am using latest -Current and add the following flags to /etc/make.conf.
# CFLAGS+=3D -g -fsanitize=3Daddress -fno-omit-frame-pointer
I rebuild /bin/sh as a first step. with the /bin/sh I got the above error.
I would like to understand how to get symbols. The following command
doesn't work at all.
addr2line -e /bin/sh 0x422b9d
=E2=80=8BAny idea?=E2=80=8B
--=20
-Howard
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