Changeset 942305 in git for Singular/cntrlc.cc

Timestamp:

Nov 19, 2020, 2:51:56 PM (3 years ago)

Author:

Hans Schoenemann <hannes@…>

Branches:

(u'spielwiese', 'e7cc1ebecb61be8b9ca6c18016352af89940b21a')

Children:

2e7c6b095bd02b92f7355c8c0aa193435fd1af8e

Parents:

93071995c509c3daf345991ea24275045205d604

Message:

doc: automaticallay call gdb with debug version

File:

• Singular/cntrlc.cc (modified) (1 diff)

Singular/cntrlc.cc

@@ -376 +376 @@
     return;
   }
+  /* REMARK FOR NEWER LINUX SYSTEMS:
+Attaching to a process on Linux with GDB as a normal user may fail with "ptrace:Operation not permitted". By default Linux does not allow attaching to a process which wasn't launched by the debugger (see the Yama security documentation for more details). (https://www.kernel.org/doc/Documentation/security/Yama.txt)
+
+There are ways to workaround this:
+
+    Run the following command as super user: echo 0| sudo tee /proc/sys/kernel/yama/ptrace_scope
+
+    This will set the ptrace level to 0, after this just with user permissions you can attach to processes which are not launched by the debugger.
+
+    On distributions without Yama (such as Raspbian) you can use libcap2-bin to assign ptrace permissions to specific executables: sudo setcap cap_sys_ptrace=eip /usr/bin/gdb
+*/
   int pid;
   char buf[16];