[PATCH v21 21/28] x86/fault: Add helper function to sanitize error code

From: Jarkko Sakkinen
Date: Sat Jul 13 2019 - 13:12:19 EST


From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>

...to prepare for vDSO exception fixup, which will expose the error code
to userspace and runs before set_signal_archinfo(), i.e. suppresses the
signal when fixup is successful.

Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
arch/x86/mm/fault.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 117262676e93..140f1196f819 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -701,6 +701,18 @@ pgtable_bad(struct pt_regs *regs, unsigned long error_code,
oops_end(flags, regs, sig);
}

+static void sanitize_error_code(unsigned long address,
+ unsigned long *error_code)
+{
+ /*
+ * To avoid leaking information about the kernel page
+ * table layout, pretend that user-mode accesses to
+ * kernel addresses are always protection faults.
+ */
+ if (address >= TASK_SIZE_MAX)
+ *error_code |= X86_PF_PROT;
+}
+
static void set_signal_archinfo(unsigned long address,
unsigned long error_code)
{
@@ -757,6 +769,8 @@ no_context(struct pt_regs *regs, unsigned long error_code,
* faulting through the emulate_vsyscall() logic.
*/
if (current->thread.sig_on_uaccess_err && signal) {
+ sanitize_error_code(address, &error_code);
+
set_signal_archinfo(address, error_code);

/* XXX: hwpoison faults will set the wrong code. */
@@ -905,13 +919,7 @@ __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
if (is_errata100(regs, address))
return;

- /*
- * To avoid leaking information about the kernel page table
- * layout, pretend that user-mode accesses to kernel addresses
- * are always protection faults.
- */
- if (address >= TASK_SIZE_MAX)
- error_code |= X86_PF_PROT;
+ sanitize_error_code(address, &error_code);

if (likely(show_unhandled_signals))
show_signal_msg(regs, error_code, address, tsk);
@@ -1028,6 +1036,8 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
if (is_prefetch(regs, error_code, address))
return;

+ sanitize_error_code(address, &error_code);
+
set_signal_archinfo(address, error_code);

#ifdef CONFIG_MEMORY_FAILURE
--
2.20.1