[commit] 1.3: make -DC work with yama ptrace protection

[Oswald Buddenhagen via isync-devel]

commit 121448ceb9f9df03d88672917fe04506f783c76c
Author: Oswald Buddenhagen <o...@users.sf.net>
Date:   Tue Dec 3 13:00:19 2019 +0100

    make -DC work with yama ptrace protection

 src/main.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/main.c b/src/main.c
index 9dbb116..d301e6f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -30,6 +30,9 @@
 #include <signal.h>
 #include <time.h>
 #include <sys/wait.h>
+#ifdef __linux__
+# include <sys/prctl.h>
+#endif
 
 int DFlags;
 int JLimit;
@@ -144,17 +147,34 @@ crashHandler( int n )
        dup2( 0, 1 );
        dup2( 0, 2 );
        error( "*** " EXE " caught signal %d. Starting debugger ...\n", n );
+#ifdef PR_SET_PTRACER
+       int pip[2];
+       if (pipe( pip ) < 0) {
+               perror( "pipe()" );
+               exit( 3 );
+       }
+#endif
        switch ((dpid = fork())) {
        case -1:
                perror( "fork()" );
                break;
        case 0:
+#ifdef PR_SET_PTRACER
+               close( pip[1] );
+               read( pip[0], pbuf, 1 );
+               close( pip[0] );
+#endif
                sprintf( pbuf, "%d", Pid );
                sprintf( pabuf, "/proc/%d/exe", Pid );
                execlp( "gdb", "gdb", pabuf, pbuf, (char *)0 );
                perror( "execlp()" );
                _exit( 1 );
        default:
+#ifdef PR_SET_PTRACER
+               prctl( PR_SET_PTRACER, (ulong)dpid );
+               close( pip[1] );
+               close( pip[0] );
+#endif
                waitpid( dpid, 0, 0 );
                break;
        }


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