From: Janosch Frank <frankja@linux.ibm.com>
Date: Tue, 12 Jan 2021 05:40:53 -0500
Subject: s390: mm: Fix secure storage access exception handling
Git-commit: 85b18d7b5e7ffefb2f076186511d39c4990aa005
Patch-mainline: v5.14-rc1
References: git-fixes

Turns out that the bit 61 in the TEID is not always 1 and if that's
the case the address space ID and the address are
unpredictable. Without an address and its address space ID we can't
export memory and hence we can only send a SIGSEGV to the process or
panic the kernel depending on who caused the exception.

Unfortunately bit 61 is only reliable if we have the "misc" UV feature
bit.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Fixes: 084ea4d611a3d ("s390/mm: add (non)secure page access exceptions handlers")
Cc: stable@vger.kernel.org
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
[ ptesarik: Since mainline commit 2efc459d06f1630001e3984854848a5647086232
  is missing in SLE15-SP2, I'm using sprintf() instead of sysfs_emit(). ]
Signed-off-by: Petr Tesarik <ptesarik@suse.com>
---
 arch/s390/boot/uv.c        |    1 +
 arch/s390/include/asm/uv.h |    8 +++++++-
 arch/s390/kernel/uv.c      |   10 ++++++++++
 arch/s390/mm/fault.c       |   26 ++++++++++++++++++++++++++
 4 files changed, 44 insertions(+), 1 deletion(-)

--- a/arch/s390/boot/uv.c
+++ b/arch/s390/boot/uv.c
@@ -33,6 +33,7 @@ void uv_query_info(void)
 		uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
 		uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
 		uv_info.max_guest_cpus = uvcb.max_guest_cpus;
+		uv_info.uv_feature_indications = uvcb.uv_feature_indications;
 	}
 
 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
--- a/arch/s390/include/asm/uv.h
+++ b/arch/s390/include/asm/uv.h
@@ -72,6 +72,10 @@ enum uv_cmds_inst {
 	BIT_UVC_CMD_UNPIN_PAGE_SHARED = 22,
 };
 
+enum uv_feat_ind {
+	BIT_UV_FEAT_MISC = 0,
+};
+
 struct uv_cb_header {
 	u16 len;
 	u16 cmd;	/* Command Code */
@@ -96,7 +100,8 @@ struct uv_cb_qui {
 	u64 max_guest_stor_addr;
 	u8  reserved88[158 - 136];
 	u16 max_guest_cpus;
-	u8  reserveda0[200 - 160];
+	u64 uv_feature_indications;
+	u8  reserveda0[200 - 168];
 } __packed __aligned(8);
 
 /* Initialize Ultravisor */
@@ -273,6 +278,7 @@ struct uv_info {
 	unsigned long max_sec_stor_addr;
 	unsigned int max_num_sec_conf;
 	unsigned short max_guest_cpus;
+	unsigned long uv_feature_indications;
 };
 
 extern struct uv_info uv_info;
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -341,6 +341,15 @@ static ssize_t uv_query_facilities(struc
 static struct kobj_attribute uv_query_facilities_attr =
 	__ATTR(facilities, 0444, uv_query_facilities, NULL);
 
+static ssize_t uv_query_feature_indications(struct kobject *kobj,
+					    struct kobj_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%lx\n", uv_info.uv_feature_indications);
+}
+
+static struct kobj_attribute uv_query_feature_indications_attr =
+	__ATTR(feature_indications, 0444, uv_query_feature_indications, NULL);
+
 static ssize_t uv_query_max_guest_cpus(struct kobject *kobj,
 				       struct kobj_attribute *attr, char *page)
 {
@@ -373,6 +382,7 @@ static struct kobj_attribute uv_query_ma
 
 static struct attribute *uv_query_attrs[] = {
 	&uv_query_facilities_attr.attr,
+	&uv_query_feature_indications_attr.attr,
 	&uv_query_max_guest_cpus_attr.attr,
 	&uv_query_max_guest_vms_attr.attr,
 	&uv_query_max_guest_addr_attr.attr,
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -827,6 +827,32 @@ void do_secure_storage_access(struct pt_
 	struct page *page;
 	int rc;
 
+	/*
+	 * bit 61 tells us if the address is valid, if it's not we
+	 * have a major problem and should stop the kernel or send a
+	 * SIGSEGV to the process. Unfortunately bit 61 is not
+	 * reliable without the misc UV feature so we need to check
+	 * for that as well.
+	 */
+	if (test_bit_inv(BIT_UV_FEAT_MISC, &uv_info.uv_feature_indications) &&
+	    !test_bit_inv(61, &regs->int_parm_long)) {
+		/*
+		 * When this happens, userspace did something that it
+		 * was not supposed to do, e.g. branching into secure
+		 * memory. Trigger a segmentation fault.
+		 */
+		if (user_mode(regs)) {
+			send_sig(SIGSEGV, current, 0);
+			return;
+		}
+
+		/*
+		 * The kernel should never run into this case and we
+		 * have no way out of this situation.
+		 */
+		panic("Unexpected PGM 0x3d with TEID bit 61=0");
+	}
+
 	switch (get_fault_type(regs)) {
 	case USER_FAULT:
 		mm = current->mm;