QTest::CrashHandler: allow debugging crashed tests on Linux+YAMA

The YAMA LSM by default[1] prevents attaching the debugger to any
process that isn't a child. Since our backtracer comes from a child
process instead (i.e., tracing the parent), we must grant explicit
permission. This also makes QTEST_PAUSE_ON_CRASH=1 work.

[1] https://codebrowser.dev/linux/linux/security/yama/yama_lsm.c.html#ptrace_scope

Pick-to: 6.8
Change-Id: Ic19d84a7a730c7f8fc0ffffd64e516447e4b1f35
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
This commit is contained in:
Thiago Macieira 2024-09-19 13:05:35 -07:00
parent 0120d8ea1e
commit 731b1159f9

View File

@ -61,6 +61,7 @@
#include <stdlib.h>
#if defined(Q_OS_LINUX)
#include <sys/prctl.h>
#include <sys/types.h>
#include <fcntl.h>
#endif
@ -327,6 +328,11 @@ void generateStackTrace()
if (debugger == None || alreadyDebugging())
return;
# if defined(Q_OS_LINUX) && defined(PR_SET_PTRACER)
// allow ourselves to be debugged
(void) prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY);
# endif
# if defined(Q_OS_UNIX) && !defined(Q_OS_WASM) && !defined(Q_OS_INTEGRITY) && !defined(Q_OS_VXWORKS)
writeToStderr("\n=== Stack trace ===\n");