Le 01/08/2023 à 03:17, Benjamin Gray a écrit : > Syzkaller triggered a null pointer dereference in the > arch_unregister_hw_breakpoint() hook. This is due to accessing > the bp->ctx->task field changing to -1 while we iterate the breakpoints. > > This series refactors the breakpoint tracking logic to remove the > dependency on bp->ctx entirely. It also simplifies handling of ptrace and > perf breakpoints, making insertion less restrictive.
Is there any link between this series and the following issue: https://github.com/linuxppc/issues/issues/38 Christophe > > If merged, it allows several arch hooks that PowerPC was the sole user of > to be removed. > > Benjamin Gray (7): > powerpc/watchpoints: Explain thread_change_pc() more > powerpc/watchpoints: Don't track info persistently > powerpc/watchpoints: Track perf single step directly on the breakpoint > powerpc/watchpoints: Simplify watchpoint reinsertion > powerpc/watchpoints: Remove ptrace/perf exclusion tracking > selftests/powerpc/ptrace: Update ptrace-perf watchpoint selftest > perf/hw_breakpoint: Remove arch breakpoint hooks > > arch/powerpc/include/asm/hw_breakpoint.h | 1 + > arch/powerpc/include/asm/processor.h | 5 - > arch/powerpc/kernel/hw_breakpoint.c | 388 +----- > include/linux/hw_breakpoint.h | 3 - > kernel/events/hw_breakpoint.c | 28 - > .../testing/selftests/powerpc/ptrace/Makefile | 1 + > .../powerpc/ptrace/ptrace-perf-asm.S | 33 + > .../powerpc/ptrace/ptrace-perf-hwbreak.c | 1104 +++++++---------- > 8 files changed, 537 insertions(+), 1026 deletions(-) > create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-perf-asm.S > rewrite tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c (93%) >
