From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
To: mpe@ellerman.id.au
Cc: ravi.bangoria@linux.ibm.com, mikey@neuling.org, paulus@samba.org,
christophe.leroy@c-s.fr, naveen.n.rao@linux.vnet.ibm.com,
pedromfc@br.ibm.com, rogealve@br.ibm.com, jniethe5@gmail.com,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 1/2] powerpc/watchpoint/ptrace: Fix SETHWDEBUG when CONFIG_HAVE_HW_BREAKPOINT=N
Date: Wed, 5 Aug 2020 11:57:49 +0530 [thread overview]
Message-ID: <20200805062750.290289-2-ravi.bangoria@linux.ibm.com> (raw)
In-Reply-To: <20200805062750.290289-1-ravi.bangoria@linux.ibm.com>
When kernel is compiled with CONFIG_HAVE_HW_BREAKPOINT=N, user can
still create watchpoint using PPC_PTRACE_SETHWDEBUG, with limited
functionalities. But, such watchpoints are never firing because of
the missing privilege settings. Fix that.
Reported-by: Pedro Miraglia Franco de Carvalho <pedromfc@br.ibm.com>
Suggested-by: Pedro Miraglia Franco de Carvalho <pedromfc@br.ibm.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
arch/powerpc/kernel/ptrace/ptrace-noadv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/ptrace/ptrace-noadv.c b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
index 697c7e4b5877..bf94ab837735 100644
--- a/arch/powerpc/kernel/ptrace/ptrace-noadv.c
+++ b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
@@ -217,7 +217,7 @@ long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_inf
return -EIO;
brk.address = ALIGN_DOWN(bp_info->addr, HW_BREAKPOINT_SIZE);
- brk.type = HW_BRK_TYPE_TRANSLATE;
+ brk.type = HW_BRK_TYPE_TRANSLATE | HW_BRK_TYPE_USER;
brk.len = DABR_MAX_LEN;
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
brk.type |= HW_BRK_TYPE_READ;
--
2.26.2
next prev parent reply other threads:[~2020-08-05 6:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-05 6:27 [PATCH v3 0/2] powerpc/watchpoint/ptrace: Buf fix plus new feature flag Ravi Bangoria
2020-08-05 6:27 ` Ravi Bangoria [this message]
2020-08-05 6:27 ` [PATCH v3 2/2] powerpc/watchpoint/ptrace: Introduce PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 Ravi Bangoria
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