dtrace fails to trace on FreeBSD-14(CURRENT) with ASLR and W^X
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Date: Mon, 14 Feb 2022 11:03:47 UTC
Encountered this issue while running https://github.com/freebsd/freebsd-src/blob/main/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.emptystack.d a somewhat simpler method to reproduce configuration file /usr/bin/find /usr/bin/find: ELF 64-bit LSB shared object, x86-64, <.....> kern.elf64.allow_wx: 0 kern.elf64.aslr.pie_enable: 1 kern.elf64.aslr.enable: 1 # dtrace -n pid92817:::entry dtrace: description 'pid92817:::entry' matched 4380 probes [2] + trace trap (core dumped) exec find / > /dev/null 2>&1 # exec find / > /dev/null 2>&1 & [1] 85293 # dtrace -n pid85293:a.out:: dtrace: description 'pid85293:a.out::' matched 6828 probes [1] + trace trap (core dumped) exec find / > /dev/null 2>&1 CPU ID FUNCTION:NAME 1 89149 find_execute:1f8 looking at find core in gdb (gdb) p $_siginfo $1 = { si_signo = 5, si_errno = 0, si_code = 3, . . . Can someone help me understand why am I seeing core due to SIGTRAP TRAP_DTRACE ? Regards Amit