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From: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: "Alastair D'Silva" <alastair@d-silva.org>,
	Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
	Balbir Singh <bsingharora@gmail.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Christophe Leroy <christophe.leroy@c-s.fr>,
	Cyril Bur <cyrilbur@gmail.com>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	Joe Perches <joe@perches.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Michael Neuling <mikey@neuling.org>,
	Murilo Opsfelder Araujo <muriloo@linux.ibm.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Paul Mackerras <paulus@samba.org>,
	Simon Guo <wei.guo.simon@gmail.com>,
	Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
	"Tobin C . Harding" <me@tobin.cc>,
	linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v3 6/9] powerpc: Do not call __kernel_text_address() in show_instructions()
Date: Tue, 31 Jul 2018 11:50:17 -0300	[thread overview]
Message-ID: <20180731145020.14009-7-muriloo@linux.ibm.com> (raw)
In-Reply-To: <20180731145020.14009-1-muriloo@linux.ibm.com>

Modify show_instructions() not to call __kernel_text_address(), allowing
userspace instruction dump.  probe_kernel_address(), which returns -EFAULT
if something goes wrong, is still being called.

Signed-off-by: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
---
 arch/powerpc/kernel/process.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index e9533b4d2f08..50094c44bf79 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1283,8 +1283,7 @@ static void show_instructions(struct pt_regs *regs)
 			pc = (unsigned long)phys_to_virt(pc);
 #endif
 
-		if (!__kernel_text_address(pc) ||
-		     probe_kernel_address((unsigned int __user *)pc, instr)) {
+		if (probe_kernel_address((unsigned int __user *)pc, instr)) {
 			pr_cont("XXXXXXXX ");
 		} else {
 			if (regs->nip == pc)
-- 
2.17.1


  parent reply	other threads:[~2018-07-31 14:51 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-31 14:50 [PATCH v3 0/9] powerpc: Modernize unhandled signals message Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 1/9] powerpc/traps: Print unhandled signals in a separate function Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 2/9] powerpc/traps: Return early in show_signal_msg() Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 3/9] powerpc/traps: Use %lx format " Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 4/9] powerpc/traps: Print VMA for unhandled signals Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 5/9] powerpc/traps: Print signal name " Murilo Opsfelder Araujo
2018-08-01  6:37   ` Christophe LEROY
2018-08-01  7:03     ` Joe Perches
2018-08-01  7:03       ` Joe Perches
2018-08-01  7:49       ` Segher Boessenkool
2018-08-01 14:44         ` Murilo Opsfelder Araujo
2018-08-01 14:42       ` Murilo Opsfelder Araujo
2018-07-31 14:50 ` Murilo Opsfelder Araujo [this message]
2018-07-31 14:50 ` [PATCH v3 7/9] powerpc: Add stacktrace.h header Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 8/9] powerpc/traps: Show instructions on exceptions Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 9/9] powerpc/traps: Add line prefix in show_instructions() Murilo Opsfelder Araujo
2018-08-01  6:41   ` Christophe LEROY
2018-08-01 14:14     ` Michael Ellerman
2018-08-01 14:14       ` Michael Ellerman
2018-08-01 15:03     ` Murilo Opsfelder Araujo

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