linux-kernel - [tip: x86/core] perf/x86/intel/ds: Check return values of insn decoder functions

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: <161582326782.398.3184167624440051970.tip-bot2@tip-bot2>
Date:   Mon, 15 Mar 2021 15:47:47 -0000
From:   "tip-bot2 for Borislav Petkov" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Borislav Petkov <bp@...e.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] perf/x86/intel/ds: Check return values of insn
 decoder functions

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     8c98a605544cfdec21d32fcf8fc855dc439f608f
Gitweb:        https://git.kernel.org/tip/8c98a605544cfdec21d32fcf8fc855dc439f608f
Author:        Borislav Petkov <bp@...e.de>
AuthorDate:    Fri, 06 Nov 2020 16:36:24 +01:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Mon, 15 Mar 2021 11:23:48 +01:00

perf/x86/intel/ds: Check return values of insn decoder functions

branch_type() doesn't need to call the full insn_decode() because it
doesn't need it in all cases thus leave the calls separate.

Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lkml.kernel.org/r/20210304174237.31945-9-bp@alien8.de
---
 arch/x86/events/intel/lbr.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index 21890da..9ecf502 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1224,8 +1224,7 @@ static int branch_type(unsigned long from, unsigned long to, int abort)
 	is64 = kernel_ip((unsigned long)addr) || any_64bit_mode(current_pt_regs());
 #endif
 	insn_init(&insn, addr, bytes_read, is64);
-	insn_get_opcode(&insn);
-	if (!insn.opcode.got)
+	if (insn_get_opcode(&insn))
 		return X86_BR_ABORT;
 
 	switch (insn.opcode.bytes[0]) {
@@ -1262,8 +1261,7 @@ static int branch_type(unsigned long from, unsigned long to, int abort)
 		ret = X86_BR_INT;
 		break;
 	case 0xe8: /* call near rel */
-		insn_get_immediate(&insn);
-		if (insn.immediate1.value == 0) {
+		if (insn_get_immediate(&insn) || insn.immediate1.value == 0) {
 			/* zero length call */
 			ret = X86_BR_ZERO_CALL;
 			break;
@@ -1279,7 +1277,9 @@ static int branch_type(unsigned long from, unsigned long to, int abort)
 		ret = X86_BR_JMP;
 		break;
 	case 0xff: /* call near absolute, call far absolute ind */
-		insn_get_modrm(&insn);
+		if (insn_get_modrm(&insn))
+			return X86_BR_ABORT;
+
 		ext = (insn.modrm.bytes[0] >> 3) & 0x7;
 		switch (ext) {
 		case 2: /* near ind call */