Revert "powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC"

This reverts commit 566af8cda399c088763d07464463dc871c943b54.

This caused some conflicts vs the audit tree, and the audit maintainers
would prefer we postpone this to the next merge window so we have more
time for testing.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

5 files changed, 135 insertions, 8 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e43e17987b92..4267d27bef52 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -162,7 +162,6 @@ config PPC
 	select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
 	select ARCH_WANT_LD_ORPHAN_WARN
 	select ARCH_WEAK_RELEASE_ACQUIRE
-	select AUDIT_ARCH_COMPAT_GENERIC
 	select BINFMT_ELF
 	select BUILDTIME_TABLE_SORT
 	select CLONE_BACKWARDS
@@ -317,6 +316,10 @@ config GENERIC_TBSYNC
 	bool
 	default y if PPC32 && SMP
 
+config AUDIT_ARCH
+	bool
+	default y
+
 config GENERIC_BUG
 	bool
 	default y
diff --git a/arch/powerpc/include/asm/unistd32.h b/arch/powerpc/include/asm/unistd32.h
deleted file mode 100644
index 07689897d206..000000000000
--- a/arch/powerpc/include/asm/unistd32.h
+++ /dev/null
@@ -1,7 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-#ifndef _ASM_POWERPC_UNISTD32_H_
-#define _ASM_POWERPC_UNISTD32_H_
-
-#include <asm/unistd_32.h>
-
-#endif /* _ASM_POWERPC_UNISTD32_H_ */
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index d079292525b6..0e3640e14eb1 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -125,6 +125,9 @@ obj-$(CONFIG_PCI)		+= pci_$(BITS).o $(pci64-y) \
 				   pci-common.o pci_of_scan.o
 obj-$(CONFIG_PCI_MSI)		+= msi.o
 
+obj-$(CONFIG_AUDIT)		+= audit.o
+obj64-$(CONFIG_AUDIT)		+= compat_audit.o
+
 obj-$(CONFIG_PPC_IO_WORKAROUNDS)	+= io-workarounds.o
 
 obj-y				+= trace/
diff --git a/arch/powerpc/kernel/audit.c b/arch/powerpc/kernel/audit.c
new file mode 100644
index 000000000000..a2dddd7f3d09
--- /dev/null
+++ b/arch/powerpc/kernel/audit.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/audit.h>
+#include <asm/unistd.h>
+
+static unsigned dir_class[] = {
+#include <asm-generic/audit_dir_write.h>
+~0U
+};
+
+static unsigned read_class[] = {
+#include <asm-generic/audit_read.h>
+~0U
+};
+
+static unsigned write_class[] = {
+#include <asm-generic/audit_write.h>
+~0U
+};
+
+static unsigned chattr_class[] = {
+#include <asm-generic/audit_change_attr.h>
+~0U
+};
+
+static unsigned signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
+int audit_classify_arch(int arch)
+{
+#ifdef CONFIG_PPC64
+	if (arch == AUDIT_ARCH_PPC)
+		return 1;
+#endif
+	return 0;
+}
+
+int audit_classify_syscall(int abi, unsigned syscall)
+{
+#ifdef CONFIG_PPC64
+	extern int ppc32_classify_syscall(unsigned);
+	if (abi == AUDIT_ARCH_PPC)
+		return ppc32_classify_syscall(syscall);
+#endif
+	switch(syscall) {
+	case __NR_open:
+		return 2;
+	case __NR_openat:
+		return 3;
+	case __NR_socketcall:
+		return 4;
+	case __NR_execve:
+		return 5;
+	default:
+		return 0;
+	}
+}
+
+static int __init audit_classes_init(void)
+{
+#ifdef CONFIG_PPC64
+	extern __u32 ppc32_dir_class[];
+	extern __u32 ppc32_write_class[];
+	extern __u32 ppc32_read_class[];
+	extern __u32 ppc32_chattr_class[];
+	extern __u32 ppc32_signal_class[];
+	audit_register_class(AUDIT_CLASS_WRITE_32, ppc32_write_class);
+	audit_register_class(AUDIT_CLASS_READ_32, ppc32_read_class);
+	audit_register_class(AUDIT_CLASS_DIR_WRITE_32, ppc32_dir_class);
+	audit_register_class(AUDIT_CLASS_CHATTR_32, ppc32_chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL_32, ppc32_signal_class);
+#endif
+	audit_register_class(AUDIT_CLASS_WRITE, write_class);
+	audit_register_class(AUDIT_CLASS_READ, read_class);
+	audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class);
+	audit_register_class(AUDIT_CLASS_CHATTR, chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL, signal_class);
+	return 0;
+}
+
+__initcall(audit_classes_init);
diff --git a/arch/powerpc/kernel/compat_audit.c b/arch/powerpc/kernel/compat_audit.c
new file mode 100644
index 000000000000..55c6ccda0a85
--- /dev/null
+++ b/arch/powerpc/kernel/compat_audit.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0
+#undef __powerpc64__
+#include <asm/unistd.h>
+
+unsigned ppc32_dir_class[] = {
+#include <asm-generic/audit_dir_write.h>
+~0U
+};
+
+unsigned ppc32_chattr_class[] = {
+#include <asm-generic/audit_change_attr.h>
+~0U
+};
+
+unsigned ppc32_write_class[] = {
+#include <asm-generic/audit_write.h>
+~0U
+};
+
+unsigned ppc32_read_class[] = {
+#include <asm-generic/audit_read.h>
+~0U
+};
+
+unsigned ppc32_signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
+int ppc32_classify_syscall(unsigned syscall)
+{
+	switch(syscall) {
+	case __NR_open:
+		return 2;
+	case __NR_openat:
+		return 3;
+	case __NR_socketcall:
+		return 4;
+	case __NR_execve:
+		return 5;
+	default:
+		return 1;
+	}
+}