linux-kernel - [tip:x86/asm] x86/asm/entry: Zero EXTRA_REGS for stub32

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: <tip-0f90fb979d7b53d80a6d5cb6e127b4b4b249907e@git.kernel.org>
Date:	Thu, 9 Apr 2015 02:02:33 -0700
From:	tip-bot for Denys Vlasenko <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	keescook@...omium.org, rostedt@...dmis.org, ast@...mgrid.com,
	fweisbec@...il.com, mingo@...nel.org, hpa@...or.com,
	linux-kernel@...r.kernel.org, wad@...omium.org, bp@...en8.de,
	oleg@...hat.com, luto@...capital.net,
	torvalds@...ux-foundation.org, brgerst@...il.com,
	tglx@...utronix.de, dvlasenk@...hat.com
Subject: [tip:x86/asm] x86/asm/entry: Zero EXTRA_REGS for stub32_execve()
  too

Commit-ID:  0f90fb979d7b53d80a6d5cb6e127b4b4b249907e
Gitweb:     http://git.kernel.org/tip/0f90fb979d7b53d80a6d5cb6e127b4b4b249907e
Author:     Denys Vlasenko <dvlasenk@...hat.com>
AuthorDate: Tue, 7 Apr 2015 22:43:39 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 9 Apr 2015 10:31:24 +0200

x86/asm/entry: Zero EXTRA_REGS for stub32_execve() too

The change which affected how execve clears EXTRA_REGS missed
32-bit execve syscalls.

Fix this by using 64-bit execve stub epilogue for them too.

Run-tested.

Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Drewry <wad@...omium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-3-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/ia32/ia32entry.S  |  2 --
 arch/x86/kernel/entry_64.S | 15 +++++++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 5d8f987..a821b1c 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -571,8 +571,6 @@ GLOBAL(\label)
 
 	PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn
 	PTREGSCALL stub32_sigreturn, sys32_sigreturn
-	PTREGSCALL stub32_execve, compat_sys_execve
-	PTREGSCALL stub32_execveat, compat_sys_execveat
 	PTREGSCALL stub32_fork, sys_fork
 	PTREGSCALL stub32_vfork, sys_vfork
 
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index f7d9ba6..5380b3a 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -538,6 +538,21 @@ ENTRY(stub_x32_execveat)
 END(stub_x32_execveat)
 #endif
 
+#ifdef CONFIG_IA32_EMULATION
+ENTRY(stub32_execve)
+	CFI_STARTPROC
+	call	compat_sys_execve
+	jmp	return_from_execve
+	CFI_ENDPROC
+END(stub32_execve)
+ENTRY(stub32_execveat)
+	CFI_STARTPROC
+	call	compat_sys_execveat
+	jmp	return_from_execve
+	CFI_ENDPROC
+END(stub32_execveat)
+#endif
+
 /*
  * sigreturn is special because it needs to restore all registers on return.
  * This cannot be done with SYSRET, so use the IRET return path instead.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/