linux-kernel - [PATCH v2 07/16] powerpc/watchpoint: Get watchpoint count dynamically while disabling them

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200401061309.92442-8-ravi.bangoria@linux.ibm.com>
Date:   Wed,  1 Apr 2020 11:43:00 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     mpe@...erman.id.au, mikey@...ling.org
Cc:     apopple@...ux.ibm.com, paulus@...ba.org, npiggin@...il.com,
        christophe.leroy@....fr, naveen.n.rao@...ux.vnet.ibm.com,
        peterz@...radead.org, jolsa@...nel.org, oleg@...hat.com,
        fweisbec@...il.com, mingo@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        ravi.bangoria@...ux.ibm.com
Subject: [PATCH v2 07/16] powerpc/watchpoint: Get watchpoint count dynamically while disabling them

Instead of disabling only one watchpoint, get num of available
watchpoints dynamically and disable all of them.

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
---
 arch/powerpc/include/asm/hw_breakpoint.h | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/include/asm/hw_breakpoint.h b/arch/powerpc/include/asm/hw_breakpoint.h
index 4e4976c3248b..fae33c729ba9 100644
--- a/arch/powerpc/include/asm/hw_breakpoint.h
+++ b/arch/powerpc/include/asm/hw_breakpoint.h
@@ -78,14 +78,13 @@ extern void ptrace_triggered(struct perf_event *bp,
 			struct perf_sample_data *data, struct pt_regs *regs);
 static inline void hw_breakpoint_disable(void)
 {
-	struct arch_hw_breakpoint brk;
-
-	brk.address = 0;
-	brk.type = 0;
-	brk.len = 0;
-	brk.hw_len = 0;
-	if (ppc_breakpoint_available())
-		__set_breakpoint(&brk, 0);
+	int i;
+	struct arch_hw_breakpoint null_brk = {0};
+
+	if (ppc_breakpoint_available()) {
+		for (i = 0; i < nr_wp_slots(); i++)
+			__set_breakpoint(&null_brk, i);
+	}
 }
 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
 int hw_breakpoint_handler(struct die_args *args);
-- 
2.21.1