Emulate getpgrp if it's blocked by SECCOMP

Fixes #14
termux · May 1, 2018 · 793b096 · 793b096
1 parent 88b915e
commit 793b096
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/src/tracee/seccomp.c b/src/tracee/seccomp.c
@@ -1,5 +1,6 @@
 #include <errno.h>     /* E*, */
 #include <signal.h>    /* SIGSYS, */
+#include <unistd.h>    /* getpgid, */
 
 #include "cli/note.h"
 #include "syscall/chain.h"
@@ -40,6 +41,15 @@ int handle_seccomp_event(Tracee* tracee) {
 		signal = 0;
 		break;
 
+	case PR_getpgrp:
+		/* Query value with getpgid and set it as result.  */
+		poke_reg(tracee, SYSARG_RESULT, getpgid(tracee->pid));
+		push_specific_regs(tracee, false);
+
+		/* Swallow signal */
+		signal = 0;
+		break;
+
 	case PR_set_robust_list:
 	default:
 		/* Set errno to -ENOSYS */