Hi, On Tue, Apr 05, 2016 at 10:08:51PM -0400, John Fleming wrote: > Hi all! First off a quick bit of history. I have a Checkpoint firewall > running busybox with glibc 2.5 linux 2.6.22.18 and a arm ARM926EJ-S rev 1 > (v5l). I spent around 3 months pushing my known how, but after countless > searches, lfs attempts and many rounds of cursing, I have what I think its > a working cross compile environment. Strace was one of the main reasons I > wanted to do get this cross compiler going. > > So.. Now that I have done that and found that strace will crash when i > using the -f option when calling checkpoint's cli utility. I don't know if > there are other commands that will do this, but I know Checkpoint's cli > will fork/create many other sub processes. > > In this example i'm just asking cli utilty what the BGP as number is. I'm > running this as uid 0 under bash. > > So .. for example. > > /strace -o /logs/output.txt -s 1048 -f clish -c "show as" > Segmentation fault (core dumped) > [Expert@FW# > Autonomous system number: 0 > > Strace crashes, clish (this is the checkpoint shell) works fine. > > Side note, strace seems to work without the -f option. > > Here is a backtrace. I recompiled with -O0, but i don't know enough about > gdb to take this any further. BTW gdb was built with same cross compiler. > > Core was generated by `/strace -o /logs/output.txt -s 1048 -f clish -c show > as'. > Program terminated with signal SIGSEGV, Segmentation fault. > #0 0x4009b094 in strlen () from /lib/libc.so.6 > (gdb) where > #0 0x4009b094 in strlen () from /lib/libc.so.6 > #1 0x4008d138 in fputs_unlocked () from /lib/libc.so.6 > #2 0x00025818 in tprints (str=0x0) at strace.c:562 > #3 0x0003104c in printflags (xlat=0x3e23c <sock_type_flags>, flags=0, > dflt=0x3edd0 "SOCK_???") at util.c:345
This is a side effect of old/incomplete system headers that do not provide definitions for SOCK_CLOEXEC and SOCK_NONBLOCK. This potential null dereference bug was fixed by commit v4.11~147, so try building v4.11 instead of v4.10. -- ldv
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