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2ce4aedfab
On Ubuntu systems, ptrace_scoping could forbid a process to ptrace another. This ptrace scoping was already handled for vgdb by using SET_PTRACER (the valgrind process must be ptraced by vgdb when it is blocked in a syscall). set_ptracer is however also needed when the old mechanism --db-attach=yes is used. The following changes are done: * make the set_ptracer logic callable outside gdbserver * make set_ptracer less restrictive (i.e. allow all processes of the user to ptrace). This removes a limitation for vgdb. * call the set_ptracer in the child launched for --db-attach=yes * cleaned up the ptrace scope restriction message and doc as vgdb is now working properly by default, even with ptrace_scope enabled. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13384