10645 2009-09-16 17:59:00 +0000 Watchpoints on unreadable memory need no singlestepping 2011-07-31 19:08:32 +0000 1 1 1 Unclassified gdb breakpoints 6.8 All All NEW P3 enhancement 6.8 1 jan.kratochvil unassigned gdb-prs jakub ppluzhnikov yuri x86_64-unknown-linux-gnu x86_64-unknown-linux-gnu oldest_to_newest 38298 0 jan.kratochvil 2009-09-16 17:59:22 +0000 Currently GDB drops on unreadable watchpoint to PTRACE_SINGLESTEP. It can use PTRACE_SYSCALL as any new memory area can appear at VMA only by a syscall. kernel feature: Better would be to setup address-specific mmap() trap (by prctl()?) or if kernel would trigger DR debug registers on their hit by mmap(). Similar problem is about disappearing memory when inferior already runs with PTRACE_CONT. Currently GDB would have to always PTRACE_SYSCALL if any hardware watchpoint is active. kernel feature: That would be better trapped by kernel on munmap() possibly checking the x86 DR debug registers at the kernel level. Feature is useful with default "set disable-randomization on" to watch memory objects since the beginning of debuggee re-run (sort of record-replay by hand). One should check also the case of `int **p = NULL;' with `watch **p'. ------------------------------------------------------------------------------ static int i, *p; int main (void) { i = 1; i = 2; p = (void *) main; return 0; } ------------------------------------------------------------------------------ (gdb) start 3 i = 1; (gdb) set debug infrun 1 (gdb) watch *p Watchpoint 2: *p (gdb) c Continuing. infrun: clear_proceed_status_thread (process 30884) infrun: proceed (addr=0xffffffffffffffff, signal=144, step=0) infrun: resume (step=1, signal=0), trap_expected=0 ^ step should be 0 PTRACE_SYSCALL should be used here, not PTRACE_SINGLESTEP. [...] Watchpoint 2: *p Old value = <unreadable> New value = -443987883 main () at /tmp/hwwatch.c:6 6 return 0; ------------------------------------------------------------------------------ 38299 1 4199 jan.kratochvil 2009-09-16 18:00:36 +0000 Created attachment 4199 Work in progress, not even a fix candidate. 38457 2 4223 jan.kratochvil 2009-09-23 14:45:37 +0000 Created attachment 4223 A (failing now) testcase for possible kernel extensions. Made for a possible inclusion to: http://sourceware.org/systemtap/wiki/utrace/tests 38458 3 4224 jan.kratochvil 2009-09-23 14:46:56 +0000 Created attachment 4224 Basic gdb/testsuite/ testcase. 40130 4 4429 dragos.tatulea 2009-11-30 16:36:57 +0000 Created attachment 4429 Same patch as jank's, only adapted to the latest gdb tree. 40131 5 4430 dragos.tatulea 2009-11-30 16:37:39 +0000 Created attachment 4430 Added more test cases. 40135 6 jan.kratochvil 2009-11-30 17:29:05 +0000 (a) There should be a GNU ChangeLog. There should be some description text to include whensubmitting it. mmap_watchpoints_triggered() has no comment, also the IMO-tricky fetch_watchpoint_value() call change and the reasons for `mem_cnt' and `val' checking. `if (step == 2)' or `else if (step == 1)' are not acceptable - currently `int step' was a boolean, if it should be tri-state it should become `enum' (or a new parameter/flag should be provided); this also affects step_string(). `struct inferior'->trap_syscalls should be removed and use the existing `catch syscall' infrastructure (I do not know it much so one should follow it more closely than these comments of mine). Is the custom PT_SYSCALL still needed with the existing `catch syscall' infrastructure? New parts I expected you could implement: (b) Catch also munmap()s. (c) mmap_watchpoints_triggered() should trigger only on mmap-related syscalls as detected by the existing `catch syscall' infrastructure. 44199 7 dragos.tatulea 2010-07-26 21:03:51 +0000 This patch: http://sourceware.org/ml/gdb-patches/2009-11/msg00429.html seems to change the behavior of watching an invalid area. Here's what happens now: GNU gdb (GDB) 7.0.50.20100131-cvs Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-unknown-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /media/a/gdb/bugzilla/10645/simple...done. (gdb) start Temporary breakpoint 1 at 0x400478: file simple.c, line 4. Starting program: /media/a/gdb/bugzilla/10645/simple Temporary breakpoint 1, main () at simple.c:4 4 i = 1; (gdb) set debug infrun 1 (gdb) watch *p Hardware watchpoint 2: *p (gdb) c Continuing. infrun: clear_proceed_status_thread (process 13517) infrun: proceed (addr=0xffffffffffffffff, signal=144, step=0) infrun: resume (step=0, signal=0), trap_expected=0 infrun: wait_for_inferior (treat_exec_as_sigtrap=0) infrun: target_wait (-1, status) = infrun: 13517 [process 13517], infrun: status->kind = stopped, signal = SIGTRAP infrun: infwait_normal_state infrun: TARGET_WAITKIND_STOPPED infrun: stop_pc = 0x400498 infrun: stopped by watchpoint infrun: stopped data address = 0x600840 infrun: BPSTAT_WHAT_STOP_NOISY infrun: stop_stepping Hardware watchpoint 2: *p Old value = <unreadable> New value = -443987883 main () at simple.c:7 7 return 0; There's no single stepping anymore (at least for this particular case). Need to investigate why. 50079 8 ppluzhnikov 2011-07-31 19:08:32 +0000 *** Bug 12956 has been marked as a duplicate of this bug. *** 4199 2009-09-16 18:00:00 +0000 2009-09-16 18:00:36 +0000 Work in progress, not even a fix candidate. hwwatch.patch text/plain 9545 jan.kratochvil LS0tIGEvZ2RiL2JyZWFrcG9pbnQuYworKysgYi9nZGIvYnJlYWtwb2ludC5jCkBAIC0xMDI4LDcg KzEwMjgsOSBAQCB1cGRhdGVfd2F0Y2hwb2ludCAoc3RydWN0IGJyZWFrcG9pbnQgKmIsIGludCBy ZXBhcnNlKQogCQkgIGFkZHIgPSB2YWx1ZV9hZGRyZXNzICh2KTsKIAkJICBsZW4gPSBUWVBFX0xF TkdUSCAodmFsdWVfdHlwZSAodikpOwogCQkgIHR5cGUgPSBod193cml0ZTsKLQkJICBpZiAoYi0+ dHlwZSA9PSBicF9yZWFkX3dhdGNocG9pbnQpCisJCSAgaWYgKHYgPT0gdmFsX2NoYWluICYmIHZh bHVlX2xhenkgKHYpKQorCQkgICAgdHlwZSA9IGh3X21tYXA7CisJCSAgZWxzZSBpZiAoYi0+dHlw ZSA9PSBicF9yZWFkX3dhdGNocG9pbnQpCiAJCSAgICB0eXBlID0gaHdfcmVhZDsKIAkJICBlbHNl IGlmIChiLT50eXBlID09IGJwX2FjY2Vzc193YXRjaHBvaW50KQogCQkgICAgdHlwZSA9IGh3X2Fj Y2VzczsKQEAgLTEyODcsOSArMTI4OSwxNyBAQCBOb3RlOiBhdXRvbWF0aWNhbGx5IHVzaW5nIGhh 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