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x86/fault: Plumb error code and fault address through to fault handlers

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This is preparation for looking at trap number and fault address in the
handlers for uaccess errors. No functional change.

Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: kernel-hardening@lists.openwall.com
Cc: linux-kernel@vger.kernel.org
Cc: dvyukov@google.com
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: Borislav Petkov <bp@alien8.de>
Link: https://lkml.kernel.org/r/20180828201421.157735-6-jannh@google.com
This commit is contained in:
Jann Horn
2018-08-28 22:14:19 +02:00
committed by Thomas Gleixner
parent 75045f77f7
commit 81fd9c1844
6 changed files with 44 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/kernel/traps.c
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@@ -206,7 +206,7 @@ do_trap_no_signal(struct task_struct *tsk, int trapnr, char *str,
}
if (!user_mode(regs)) {
if (fixup_exception(regs, trapnr))
if (fixup_exception(regs, trapnr, error_code, 0))
return 0;
tsk->thread.error_code = error_code;
@@ -551,7 +551,7 @@ do_general_protection(struct pt_regs *regs, long error_code)
tsk = current;
if (!user_mode(regs)) {
if (fixup_exception(regs, X86_TRAP_GP))
if (fixup_exception(regs, X86_TRAP_GP, error_code, 0))
return;
tsk->thread.error_code = error_code;
@@ -848,7 +848,7 @@ static void math_error(struct pt_regs *regs, int error_code, int trapnr)
cond_local_irq_enable(regs);
if (!user_mode(regs)) {
if (fixup_exception(regs, trapnr))
if (fixup_exception(regs, trapnr, error_code, 0))
return;
task->thread.error_code = error_code;