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From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
To: zohar@linux.ibm.com, bauerman@linux.ibm.com, robh@kernel.org,
	gregkh@linuxfoundation.org, james.morse@arm.com,
	catalin.marinas@arm.com, sashal@kernel.org, will@kernel.org,
	mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org,
	robh+dt@kernel.org, frowand.list@gmail.com,
	vincenzo.frascino@arm.com, mark.rutland@arm.com,
	dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com,
	pasha.tatashin@soleen.com, allison@lohutok.net,
	kstewart@linuxfoundation.org, takahiro.akashi@linaro.org,
	tglx@linutronix.de, masahiroy@kernel.org, bhsharma@redhat.com,
	mbrugger@suse.com, hsinyi@chromium.org, tao.li@vivo.com,
	christophe.leroy@c-s.fr
Cc: linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org, prsriva@linux.microsoft.com,
	balajib@linux.microsoft.com
Subject: [PATCH v10 4/8] powerpc: Use ima kexec node functions
Date: Fri,  4 Dec 2020 11:51:45 -0800	[thread overview]
Message-ID: <20201204195149.611-5-nramas@linux.microsoft.com> (raw)
In-Reply-To: <20201204195149.611-1-nramas@linux.microsoft.com>

do_get_kexec_buffer() and get_addr_size_cells() are called by
ima_get_kexec_buffer(), ima_free_kexec_buffer, and remove_ima_buffer()
to retrieve the address and size of the buffer used for carrying
forward the IMA measurement log across kexec system call. These
functions correctly handle a device tree property that is a child node
of the root node, but not anything other than the immediate root
child nodes.

Use the architecture independent functions get_ima_kexec_buffer()
and get_root_addr_size_cells() defined in "drivers/of/ima_kexec.c",
to get the address and size of the IMA measurement log buffer from
the device tree. Remove do_get_kexec_buffer() and get_addr_size_cells()
since they are not used anymore.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/kexec/ima.c | 58 +++++-----------------------------------
 1 file changed, 7 insertions(+), 51 deletions(-)

diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
index a36c39db4b1a..906e8212435d 100644
--- a/arch/powerpc/kexec/ima.c
+++ b/arch/powerpc/kexec/ima.c
@@ -13,40 +13,6 @@
 #include <linux/libfdt.h>
 #include <asm/ima.h>
 
-static int get_addr_size_cells(int *addr_cells, int *size_cells)
-{
-	struct device_node *root;
-
-	root = of_find_node_by_path("/");
-	if (!root)
-		return -EINVAL;
-
-	*addr_cells = of_n_addr_cells(root);
-	*size_cells = of_n_size_cells(root);
-
-	of_node_put(root);
-
-	return 0;
-}
-
-static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
-			       size_t *size)
-{
-	int ret, addr_cells, size_cells;
-
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	if (len < 4 * (addr_cells + size_cells))
-		return -ENOENT;
-
-	*addr = of_read_number(prop, addr_cells);
-	*size = of_read_number(prop + 4 * addr_cells, size_cells);
-
-	return 0;
-}
-
 /**
  * ima_get_kexec_buffer - get IMA buffer from the previous kernel
  * @addr:	On successful return, set to point to the buffer contents.
@@ -56,16 +22,11 @@ static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
  */
 int ima_get_kexec_buffer(void **addr, size_t *size)
 {
-	int ret, len;
+	int ret;
 	unsigned long tmp_addr;
 	size_t tmp_size;
-	const void *prop;
 
-	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
-	if (!prop)
-		return -ENOENT;
-
-	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
+	ret = get_ima_kexec_buffer(NULL, 0, &tmp_addr, &tmp_size);
 	if (ret)
 		return ret;
 
@@ -89,7 +50,7 @@ int ima_free_kexec_buffer(void)
 	if (!prop)
 		return -ENOENT;
 
-	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
+	ret = get_ima_kexec_buffer(NULL, 0, &addr, &size);
 	if (ret)
 		return ret;
 
@@ -98,7 +59,6 @@ int ima_free_kexec_buffer(void)
 		return ret;
 
 	return memblock_free(addr, size);
-
 }
 
 /**
@@ -112,19 +72,15 @@ int ima_free_kexec_buffer(void)
  */
 void remove_ima_buffer(void *fdt, int chosen_node)
 {
-	int ret, len;
+	int ret;
 	unsigned long addr;
 	size_t size;
-	const void *prop;
 
-	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
-	if (!prop)
+	ret = get_ima_kexec_buffer(fdt, chosen_node, &addr, &size);
+	if (ret)
 		return;
 
-	ret = do_get_kexec_buffer(prop, len, &addr, &size);
 	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
-	if (ret)
-		return;
 
 	ret = delete_fdt_mem_rsv(fdt, addr, size);
 	if (!ret)
@@ -191,7 +147,7 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (!image->arch.ima_buffer_size)
 		return 0;
 
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	ret = get_root_addr_size_cells(&addr_cells, &size_cells);
 	if (ret)
 		return ret;
 
-- 
2.29.2


  parent reply	other threads:[~2020-12-04 19:53 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-04 19:51 [PATCH v10 0/8] Carry forward IMA measurement log on kexec on ARM64 Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 1/8] powerpc: fix compiler warnings and errors Lakshmi Ramasubramanian
2020-12-05  1:20   ` Thiago Jung Bauermann
2020-12-04 19:51 ` [PATCH v10 2/8] powerpc: Move delete_fdt_mem_rsv() to drivers/of/kexec.c Lakshmi Ramasubramanian
2020-12-05  2:22   ` Thiago Jung Bauermann
2020-12-07  1:50     ` Lakshmi Ramasubramanian
2020-12-11 16:37       ` Lakshmi Ramasubramanian
2020-12-11 18:19         ` Thiago Jung Bauermann
2020-12-11 19:25           ` Lakshmi Ramasubramanian
2020-12-12  1:14             ` Thiago Jung Bauermann
2020-12-04 19:51 ` [PATCH v10 3/8] powerpc: Move ima buffer functions " Lakshmi Ramasubramanian
2020-12-05 19:48   ` Thiago Jung Bauermann
2020-12-07  1:53     ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` Lakshmi Ramasubramanian [this message]
2020-12-05 19:51   ` [PATCH v10 4/8] powerpc: Use ima kexec node functions Thiago Jung Bauermann
2020-12-07  1:54     ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 5/8] powerpc: Move remove_ima_buffer() to drivers/of/kexec.c Lakshmi Ramasubramanian
2020-12-05 20:14   ` Thiago Jung Bauermann
2020-12-07  1:57     ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 6/8] powerpc: Move ima_get_kexec_buffer() and ima_free_kexec_buffer() to ima Lakshmi Ramasubramanian
2020-12-05 21:02   ` Thiago Jung Bauermann
2020-12-07  1:58     ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 7/8] powerpc: Move arch_ima_add_kexec_buffer " Lakshmi Ramasubramanian
2020-12-05 21:36   ` Thiago Jung Bauermann
2020-12-07  2:03     ` Lakshmi Ramasubramanian
2020-12-07 14:57       ` Mimi Zohar
2020-12-04 19:51 ` [PATCH v10 8/8] arm64: Add IMA log information in kimage used for kexec Lakshmi Ramasubramanian
2020-12-05 21:44   ` Thiago Jung Bauermann
2020-12-07  2:05     ` Lakshmi Ramasubramanian

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