linux-kernel - [PATCH v2 3/4] arm64: kprobes: Move exception

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <154753350520.31541.11995657762766497151.stgit@devbox>
Date:   Tue, 15 Jan 2019 15:25:05 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Pratyush Anand <panand@...hat.com>,
        "David A . Long" <dave.long@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        James Morse <james.morse@....com>
Subject: [PATCH v2 3/4] arm64: kprobes: Move exception_text check in blacklist

Move exception/irqentry text address check in blacklist,
since those are symbol based rejection.

If we prohibit probing on the symbols in exception_text,
those should be blacklisted.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 arch/arm64/kernel/probes/kprobes.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
index 1dae500d0a81..b9e9758b6534 100644
--- a/arch/arm64/kernel/probes/kprobes.c
+++ b/arch/arm64/kernel/probes/kprobes.c
@@ -98,9 +98,6 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
 	/* copy instruction */
 	p->opcode = le32_to_cpu(*p->addr);
 
-	if (in_exception_text(probe_addr))
-		return -EINVAL;
-
 	if (search_exception_tables(probe_addr))
 		return -EINVAL;
 
@@ -475,7 +472,8 @@ bool arch_within_kprobe_blacklist(unsigned long addr)
 	    (addr >= (unsigned long)__entry_text_start &&
 	    addr < (unsigned long)__entry_text_end) ||
 	    (addr >= (unsigned long)__idmap_text_start &&
-	    addr < (unsigned long)__idmap_text_end))
+	    addr < (unsigned long)__idmap_text_end) ||
+	    in_exception_text(addr))
 		return true;
 
 	if (!is_kernel_in_hyp_mode()) {