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Message-ID: <753e61fc-aab5-7797-d344-b15e9f4d6d5c@kaod.org>
Date: Mon, 23 Aug 2021 10:56:18 +0200
From: Cédric Le Goater <clg@...d.org>
To: Christophe Leroy <christophe.leroy@...roup.eu>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>
CC: <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] powerpc/audit: Convert powerpc to
AUDIT_ARCH_COMPAT_GENERIC
On 8/23/21 8:49 AM, Christophe Leroy wrote:
> Commit e65e1fc2d24b ("[PATCH] syscall class hookup for all normal
> targets") added generic support for AUDIT but that didn't include
> support for bi-arch like powerpc.
>
> Commit 4b58841149dc ("audit: Add generic compat syscall support")
> added generic support for bi-arch.
>
> Convert powerpc to that bi-arch generic audit support.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
Reviewed-by: Cédric Le Goater <clg@...d.org>
Thanks,
C.
> ---
> v2:
> - Missing 'git add' for arch/powerpc/include/asm/unistd32.h
> - Finalised commit description
> ---
> arch/powerpc/Kconfig | 5 +-
> arch/powerpc/include/asm/unistd32.h | 7 +++
> arch/powerpc/kernel/Makefile | 3 --
> arch/powerpc/kernel/audit.c | 84 -----------------------------
> arch/powerpc/kernel/compat_audit.c | 44 ---------------
> 5 files changed, 8 insertions(+), 135 deletions(-)
> create mode 100644 arch/powerpc/include/asm/unistd32.h
> delete mode 100644 arch/powerpc/kernel/audit.c
> delete mode 100644 arch/powerpc/kernel/compat_audit.c
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 663766fbf505..5472358609d2 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -163,6 +163,7 @@ 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
> @@ -316,10 +317,6 @@ 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
> new file mode 100644
> index 000000000000..07689897d206
> --- /dev/null
> +++ b/arch/powerpc/include/asm/unistd32.h
> @@ -0,0 +1,7 @@
> +/* 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 7be36c1e1db6..825121eba3c2 100644
> --- a/arch/powerpc/kernel/Makefile
> +++ b/arch/powerpc/kernel/Makefile
> @@ -125,9 +125,6 @@ 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
> deleted file mode 100644
> index a2dddd7f3d09..000000000000
> --- a/arch/powerpc/kernel/audit.c
> +++ /dev/null
> @@ -1,84 +0,0 @@
> -// 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
> deleted file mode 100644
> index 55c6ccda0a85..000000000000
> --- a/arch/powerpc/kernel/compat_audit.c
> +++ /dev/null
> @@ -1,44 +0,0 @@
> -// 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;
> - }
> -}
>
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