[PATCH v4 04/17] fs/kernel_read_file: Split into separate include file
From: Kees Cook <hidden>
Date: 2020-07-29 18:00:16
Also in:
linux-efi, linux-integrity, linux-kselftest, lkml, selinux
Subsystem:
driver core, kobjects, debugfs and sysfs, exec & binfmt api, elf, extended verification module (evm), filesystems (vfs and infrastructure), firmware loader (request_firmware), integrity measurement architecture (ima), kexec, loadpin security module, security subsystem, selinux security module, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Kees Cook, Mimi Zohar, Roberto Sassu, Alexander Viro, Christian Brauner, Luis Chamberlain, Russ Weight, Dmitry Kasatkin, Andrew Morton, Baoquan He, Mike Rapoport, Pasha Tatashin, Pratyush Yadav, Paul Moore, James Morris, "Serge E. Hallyn", Stephen Smalley, Linus Torvalds
From: Scott Branden <scott.branden@broadcom.com> Move kernel_read_file* out of linux/fs.h to its own linux/kernel_read_file.h include file. That header gets pulled in just about everywhere and doesn't really need functions not related to the general fs interface. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20200706232309.12010-2-scott.branden@broadcom.com (local) Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Signed-off-by: Kees Cook <redacted> --- drivers/base/firmware_loader/main.c | 1 + fs/exec.c | 1 + include/linux/fs.h | 38 --------------------- include/linux/ima.h | 1 + include/linux/kernel_read_file.h | 51 +++++++++++++++++++++++++++++ include/linux/security.h | 1 + kernel/kexec_file.c | 1 + kernel/module.c | 1 + security/integrity/digsig.c | 1 + security/integrity/ima/ima_fs.c | 1 + security/integrity/ima/ima_main.c | 1 + security/integrity/ima/ima_policy.c | 1 + security/loadpin/loadpin.c | 1 + security/security.c | 1 + security/selinux/hooks.c | 1 + 15 files changed, 64 insertions(+), 38 deletions(-) create mode 100644 include/linux/kernel_read_file.h
diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index fe68ae278201..7fd677281806 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c@@ -12,6 +12,7 @@ #include <linux/capability.h> #include <linux/device.h> +#include <linux/kernel_read_file.h> #include <linux/module.h> #include <linux/init.h> #include <linux/timer.h>
diff --git a/fs/exec.c b/fs/exec.c
index 2bf549757ce7..07a7fe9ac5be 100644
--- a/fs/exec.c
+++ b/fs/exec.c@@ -23,6 +23,7 @@ * formats. */ +#include <linux/kernel_read_file.h> #include <linux/slab.h> #include <linux/file.h> #include <linux/fdtable.h>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0d4f7aacf286..76283ff04d37 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h@@ -2993,44 +2993,6 @@ static inline void i_readcount_inc(struct inode *inode) #endif extern int do_pipe_flags(int *, int); -/* This is a list of *what* is being read, not *how* nor *where*. */ -#define __kernel_read_file_id(id) \ - id(UNKNOWN, unknown) \ - id(FIRMWARE, firmware) \ - id(MODULE, kernel-module) \ - id(KEXEC_IMAGE, kexec-image) \ - id(KEXEC_INITRAMFS, kexec-initramfs) \ - id(POLICY, security-policy) \ - id(X509_CERTIFICATE, x509-certificate) \ - id(MAX_ID, ) - -#define __fid_enumify(ENUM, dummy) READING_ ## ENUM, -#define __fid_stringify(dummy, str) #str, - -enum kernel_read_file_id { - __kernel_read_file_id(__fid_enumify) -}; - -static const char * const kernel_read_file_str[] = { - __kernel_read_file_id(__fid_stringify) -}; - -static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id) -{ - if ((unsigned)id >= READING_MAX_ID) - return kernel_read_file_str[READING_UNKNOWN]; - - return kernel_read_file_str[id]; -} - -extern int kernel_read_file(struct file *, void **, loff_t *, loff_t, - enum kernel_read_file_id); -extern int kernel_read_file_from_path(const char *, void **, loff_t *, loff_t, - enum kernel_read_file_id); -extern int kernel_read_file_from_path_initns(const char *, void **, loff_t *, loff_t, - enum kernel_read_file_id); -extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t, - enum kernel_read_file_id); extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *); ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos); extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *);
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 9164e1534ec9..148636bfcc8f 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h@@ -7,6 +7,7 @@ #ifndef _LINUX_IMA_H #define _LINUX_IMA_H +#include <linux/kernel_read_file.h> #include <linux/fs.h> #include <linux/security.h> #include <linux/kexec.h>
diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h
new file mode 100644
index 000000000000..78cf3d7dc835
--- /dev/null
+++ b/include/linux/kernel_read_file.h@@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_KERNEL_READ_FILE_H +#define _LINUX_KERNEL_READ_FILE_H + +#include <linux/file.h> +#include <linux/types.h> + +/* This is a list of *what* is being read, not *how* nor *where*. */ +#define __kernel_read_file_id(id) \ + id(UNKNOWN, unknown) \ + id(FIRMWARE, firmware) \ + id(MODULE, kernel-module) \ + id(KEXEC_IMAGE, kexec-image) \ + id(KEXEC_INITRAMFS, kexec-initramfs) \ + id(POLICY, security-policy) \ + id(X509_CERTIFICATE, x509-certificate) \ + id(MAX_ID, ) + +#define __fid_enumify(ENUM, dummy) READING_ ## ENUM, +#define __fid_stringify(dummy, str) #str, + +enum kernel_read_file_id { + __kernel_read_file_id(__fid_enumify) +}; + +static const char * const kernel_read_file_str[] = { + __kernel_read_file_id(__fid_stringify) +}; + +static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id) +{ + if ((unsigned int)id >= READING_MAX_ID) + return kernel_read_file_str[READING_UNKNOWN]; + + return kernel_read_file_str[id]; +} + +int kernel_read_file(struct file *file, + void **buf, loff_t *size, loff_t max_size, + enum kernel_read_file_id id); +int kernel_read_file_from_path(const char *path, + void **buf, loff_t *size, loff_t max_size, + enum kernel_read_file_id id); +int kernel_read_file_from_path_initns(const char *path, + void **buf, loff_t *size, loff_t max_size, + enum kernel_read_file_id id); +int kernel_read_file_from_fd(int fd, + void **buf, loff_t *size, loff_t max_size, + enum kernel_read_file_id id); + +#endif /* _LINUX_KERNEL_READ_FILE_H */
diff --git a/include/linux/security.h b/include/linux/security.h
index 0a0a03b36a3b..42df0d9b4c37 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h@@ -23,6 +23,7 @@ #ifndef __LINUX_SECURITY_H #define __LINUX_SECURITY_H +#include <linux/kernel_read_file.h> #include <linux/key.h> #include <linux/capability.h> #include <linux/fs.h>
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 09cc78df53c6..1358069ce9e9 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c@@ -24,6 +24,7 @@ #include <linux/elf.h> #include <linux/elfcore.h> #include <linux/kernel.h> +#include <linux/kernel_read_file.h> #include <linux/syscalls.h> #include <linux/vmalloc.h> #include "kexec_internal.h"
diff --git a/kernel/module.c b/kernel/module.c
index d2d12c299dd8..cc8d83841568 100644
--- a/kernel/module.c
+++ b/kernel/module.c@@ -18,6 +18,7 @@ #include <linux/fs.h> #include <linux/sysfs.h> #include <linux/kernel.h> +#include <linux/kernel_read_file.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/elf.h>
diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index ac02b7632353..f8869be45d8f 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c@@ -10,6 +10,7 @@ #include <linux/sched.h> #include <linux/slab.h> #include <linux/cred.h> +#include <linux/kernel_read_file.h> #include <linux/key-type.h> #include <linux/digsig.h> #include <linux/vmalloc.h>
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 15a44c5022f7..e13ffece3726 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c@@ -13,6 +13,7 @@ */ #include <linux/fcntl.h> +#include <linux/kernel_read_file.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/seq_file.h>
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index f80ee4ce4669..dab4a13221cf 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c@@ -18,6 +18,7 @@ #include <linux/module.h> #include <linux/file.h> #include <linux/binfmts.h> +#include <linux/kernel_read_file.h> #include <linux/mount.h> #include <linux/mman.h> #include <linux/slab.h>
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index e493063a3c34..f8390f6081f0 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c@@ -9,6 +9,7 @@ #include <linux/init.h> #include <linux/list.h> +#include <linux/kernel_read_file.h> #include <linux/fs.h> #include <linux/security.h> #include <linux/magic.h>
diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c
index ee5cb944f4ad..81bc95127f92 100644
--- a/security/loadpin/loadpin.c
+++ b/security/loadpin/loadpin.c@@ -11,6 +11,7 @@ #include <linux/module.h> #include <linux/fs.h> +#include <linux/kernel_read_file.h> #include <linux/lsm_hooks.h> #include <linux/mount.h> #include <linux/path.h>
diff --git a/security/security.c b/security/security.c
index 70a7ad357bc6..19d3150f68f4 100644
--- a/security/security.c
+++ b/security/security.c@@ -16,6 +16,7 @@ #include <linux/export.h> #include <linux/init.h> #include <linux/kernel.h> +#include <linux/kernel_read_file.h> #include <linux/lsm_hooks.h> #include <linux/integrity.h> #include <linux/ima.h>
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index efa6108b1ce9..5de45010fb1a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c@@ -24,6 +24,7 @@ #include <linux/init.h> #include <linux/kd.h> #include <linux/kernel.h> +#include <linux/kernel_read_file.h> #include <linux/tracehook.h> #include <linux/errno.h> #include <linux/sched/signal.h>
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2.25.1