CVS commit: src/sys/kern

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Sat May 25 03:20:43 UTC 2019

Modified Files:
        src/sys/kern: sys_ptrace_common.c

Log Message:
Relax prohibition of Program Counter set to 0x0 in ptrace(2)

In PT_CONTINUE, PT_SYSCALL and PT_DETACH the 3rd argument of ptrace(2)
allows to set PC. It used to be allowed to set PC to 0x0 without
restrictions, later prohibited unconditionally.

Change the condition and make it depending on vm.user_va0_disable. Whenever
the VA 0 mapping is disallowed, reject setting PC to 0x0.

While there comment truncated and empty transfers in PT_READ/PT_WRITE
and PT_IO.


To generate a diff of this commit:
cvs rdiff -u -r1.53 -r1.54 src/sys/kern/sys_ptrace_common.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.