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arch: Rename CONFIG_DEBUG_RODATA and CONFIG_DEBUG_MODULE_RONX 

Both of these options are poorly named. The features they provide are
necessary for system security and should not be considered debug only.
Change the names to CONFIG_STRICT_KERNEL_RWX and
CONFIG_STRICT_MODULE_RWX to better describe what these options do.

Signed-off-by: Laura Abbott <labbott@redhat.com>
Acked-by: Jessica Yu <jeyu@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Laura Abbott 2017-02-06 16:31:58 -08:00 committed by Kees Cook
parent ad21fc4faa
commit 0f5bf6d0af
24 changed files with 41 additions and 43 deletions
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8
Documentation/DocBook/kgdb.tmpl
View File

@ -115,12 +115,12 @@
</para>
<para>
If the architecture that you are using supports the kernel option
CONFIG_DEBUG_RODATA, you should consider turning it off. This
CONFIG_STRICT_KERNEL_RWX, you should consider turning it off. This
option will prevent the use of software breakpoints because it
marks certain regions of the kernel's memory space as read-only.
If kgdb supports it for the architecture you are using, you can
use hardware breakpoints if you desire to run with the
CONFIG_DEBUG_RODATA option turned on, else you need to turn off
CONFIG_STRICT_KERNEL_RWX option turned on, else you need to turn off
this option.
</para>
<para>
@ -135,7 +135,7 @@
<para>Here is an example set of .config symbols to enable or
disable for kgdb:
<itemizedlist>
<listitem><para># CONFIG_DEBUG_RODATA is not set</para></listitem>
<listitem><para># CONFIG_STRICT_KERNEL_RWX is not set</para></listitem>
<listitem><para>CONFIG_FRAME_POINTER=y</para></listitem>
<listitem><para>CONFIG_KGDB=y</para></listitem>
<listitem><para>CONFIG_KGDB_SERIAL_CONSOLE=y</para></listitem>
@ -166,7 +166,7 @@
</para>
<para>Here is an example set of .config symbols to enable/disable kdb:
<itemizedlist>
<listitem><para># CONFIG_DEBUG_RODATA is not set</para></listitem>
<listitem><para># CONFIG_STRICT_KERNEL_RWX is not set</para></listitem>
<listitem><para>CONFIG_FRAME_POINTER=y</para></listitem>
<listitem><para>CONFIG_KGDB=y</para></listitem>
<listitem><para>CONFIG_KGDB_SERIAL_CONSOLE=y</para></listitem>

4
Documentation/security/self-protection.txt
View File

@ -51,8 +51,8 @@ kernel, they are implemented in a way where the memory is temporarily
made writable during the update, and then returned to the original
permissions.)
In support of this are (the poorly named) CONFIG_DEBUG_RODATA and
CONFIG_DEBUG_SET_MODULE_RONX, which seek to make sure that code is not
In support of this are CONFIG_STRICT_KERNEL_RWX and
CONFIG_STRICT_MODULE_RWX, which seek to make sure that code is not
writable, data is not executable, and read-only data is neither writable
nor executable.

4
arch/Kconfig
View File

@ -790,7 +790,7 @@ config ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
config ARCH_HAS_STRICT_KERNEL_RWX
def_bool n
config DEBUG_RODATA
config STRICT_KERNEL_RWX
bool "Make kernel text and rodata read-only" if ARCH_OPTIONAL_KERNEL_RWX
depends on ARCH_HAS_STRICT_KERNEL_RWX
default !ARCH_OPTIONAL_KERNEL_RWX || ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
@ -806,7 +806,7 @@ config DEBUG_RODATA
config ARCH_HAS_STRICT_MODULE_RWX
def_bool n
config DEBUG_SET_MODULE_RONX
config STRICT_MODULE_RWX
bool "Set loadable kernel module data as NX and text as RO" if ARCH_OPTIONAL_KERNEL_RWX
depends on ARCH_HAS_STRICT_MODULE_RWX && MODULES
default !ARCH_OPTIONAL_KERNEL_RWX || ARCH_OPTIONAL_KERNEL_RWX_DEFAULT

4
arch/arm/configs/aspeed_g4_defconfig
View File

@ -25,7 +25,6 @@ CONFIG_MODULE_UNLOAD=y
# CONFIG_ARCH_MULTI_V7 is not set
CONFIG_ARCH_ASPEED=y
CONFIG_MACH_ASPEED_G4=y
CONFIG_DEBUG_RODATA=y
CONFIG_AEABI=y
CONFIG_UACCESS_WITH_MEMCPY=y
CONFIG_SECCOMP=y
@ -79,7 +78,8 @@ CONFIG_DEBUG_LL_UART_8250=y
CONFIG_DEBUG_UART_PHYS=0x1e784000
CONFIG_DEBUG_UART_VIRT=0xe8784000
CONFIG_EARLY_PRINTK=y
CONFIG_DEBUG_SET_MODULE_RONX=y
CONFIG_STRICT_MODULE_RWX=y
CONFIG_STRICT_KERNEL_RWX=y
# CONFIG_XZ_DEC_X86 is not set
# CONFIG_XZ_DEC_POWERPC is not set
# CONFIG_XZ_DEC_IA64 is not set

4
arch/arm/configs/aspeed_g5_defconfig
View File

@ -26,7 +26,6 @@ CONFIG_ARCH_MULTI_V6=y
# CONFIG_ARCH_MULTI_V7 is not set
CONFIG_ARCH_ASPEED=y
CONFIG_MACH_ASPEED_G5=y
CONFIG_DEBUG_RODATA=y
CONFIG_AEABI=y
CONFIG_UACCESS_WITH_MEMCPY=y
CONFIG_SECCOMP=y
@ -81,7 +80,8 @@ CONFIG_DEBUG_LL_UART_8250=y
CONFIG_DEBUG_UART_PHYS=0x1e784000
CONFIG_DEBUG_UART_VIRT=0xe8784000
CONFIG_EARLY_PRINTK=y
CONFIG_DEBUG_SET_MODULE_RONX=y
CONFIG_STRICT_MODULE_RWX=y
CONFIG_STRICT_KERNEL_RWX=y
# CONFIG_XZ_DEC_X86 is not set
# CONFIG_XZ_DEC_POWERPC is not set
# CONFIG_XZ_DEC_IA64 is not set

2
arch/arm/include/asm/cacheflush.h
View File

@ -490,7 +490,7 @@ static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
#endif
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
void set_kernel_text_rw(void);
void set_kernel_text_ro(void);
#else

4
arch/arm/kernel/patch.c
View File

@ -24,9 +24,9 @@ static void __kprobes *patch_map(void *addr, int fixmap, unsigned long *flags)
bool module = !core_kernel_text(uintaddr);
struct page *page;
if (module && IS_ENABLED(CONFIG_DEBUG_SET_MODULE_RONX))
if (module && IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
page = vmalloc_to_page(addr);
else if (!module && IS_ENABLED(CONFIG_DEBUG_RODATA))
else if (!module && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
page = virt_to_page(addr);
else
return addr;

8
arch/arm/kernel/vmlinux.lds.S
View File

@ -97,7 +97,7 @@ SECTIONS
HEAD_TEXT
}
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
. = ALIGN(1<<SECTION_SHIFT);
#endif
@ -158,7 +158,7 @@ SECTIONS
NOTES
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
. = ALIGN(1<<SECTION_SHIFT);
#else
. = ALIGN(PAGE_SIZE);
@ -230,7 +230,7 @@ SECTIONS
PERCPU_SECTION(L1_CACHE_BYTES)
#endif
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
. = ALIGN(1<<SECTION_SHIFT);
#else
. = ALIGN(THREAD_SIZE);
@ -325,7 +325,7 @@ SECTIONS
STABS_DEBUG
}
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
/*
* Without CONFIG_DEBUG_ALIGN_RODATA, __start_rodata_section_aligned will
* be the first section-aligned location after __start_rodata. Otherwise,

2
arch/arm/mm/Kconfig
View File

@ -1053,7 +1053,7 @@ config ARCH_SUPPORTS_BIG_ENDIAN
config DEBUG_ALIGN_RODATA
bool "Make rodata strictly non-executable"
depends on DEBUG_RODATA
depends on STRICT_KERNEL_RWX
default y
help
If this is set, rodata will be made explicitly non-executable. This

4
arch/arm/mm/init.c
View File

@ -572,7 +572,7 @@ void __init mem_init(void)
}
}
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
struct section_perm {
const char *name;
unsigned long start;
@ -741,7 +741,7 @@ void set_kernel_text_ro(void)
#else
static inline void fix_kernmem_perms(void) { }
#endif /* CONFIG_DEBUG_RODATA */
#endif /* CONFIG_STRICT_KERNEL_RWX */
void free_tcmmem(void)
{

2
arch/arm64/Kconfig.debug
View File

@ -72,7 +72,7 @@ config DEBUG_WX
If in doubt, say "Y".
config DEBUG_ALIGN_RODATA
depends on DEBUG_RODATA
depends on STRICT_KERNEL_RWX
bool "Align linker sections up to SECTION_SIZE"
help
If this option is enabled, sections that may potentially be marked as

2
arch/arm64/kernel/insn.c
View File

@ -93,7 +93,7 @@ static void __kprobes *patch_map(void *addr, int fixmap)
bool module = !core_kernel_text(uintaddr);
struct page *page;
if (module && IS_ENABLED(CONFIG_DEBUG_SET_MODULE_RONX))
if (module && IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
page = vmalloc_to_page(addr);
else if (!module)
page = pfn_to_page(PHYS_PFN(__pa(addr)));

1
arch/parisc/configs/712_defconfig
View File

@ -182,7 +182,6 @@ CONFIG_DEBUG_FS=y
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_MUTEXES=y
# CONFIG_RCU_CPU_STALL_DETECTOR is not set
CONFIG_DEBUG_RODATA=y
CONFIG_CRYPTO_NULL=m
CONFIG_CRYPTO_TEST=m
CONFIG_CRYPTO_HMAC=y

1
arch/parisc/configs/c3000_defconfig
View File

@ -166,7 +166,6 @@ CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_MUTEXES=y
# CONFIG_DEBUG_BUGVERBOSE is not set
# CONFIG_RCU_CPU_STALL_DETECTOR is not set
CONFIG_DEBUG_RODATA=y
CONFIG_CRYPTO_NULL=m
CONFIG_CRYPTO_TEST=m
CONFIG_CRYPTO_MD5=m

2
arch/parisc/mm/init.c
View File

@ -545,7 +545,7 @@ void free_initmem(void)
}
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void)
{
/* rodata memory was already mapped with KERNEL_RO access rights by

4
include/linux/filter.h
View File

@ -543,7 +543,7 @@ static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
#define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
#ifdef CONFIG_DEBUG_SET_MODULE_RONX
#ifdef CONFIG_STRICT_MODULE_RWX
static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
{
set_memory_ro((unsigned long)fp, fp->pages);
@ -561,7 +561,7 @@ static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
{
}
#endif /* CONFIG_DEBUG_SET_MODULE_RONX */
#endif /* CONFIG_STRICT_MODULE_RWX */
int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
static inline int sk_filter(struct sock *sk, struct sk_buff *skb)

4
include/linux/init.h
View File

@ -126,10 +126,10 @@ void prepare_namespace(void);
void __init load_default_modules(void);
int __init init_rootfs(void);
#if defined(CONFIG_DEBUG_RODATA) || defined(CONFIG_DEBUG_SET_MODULE_RONX)
#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
extern bool rodata_enabled;
#endif
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void);
#endif

2
include/linux/module.h
View File

@ -764,7 +764,7 @@ extern int module_sysfs_initialized;
#define __MODULE_STRING(x) __stringify(x)
#ifdef CONFIG_DEBUG_SET_MODULE_RONX
#ifdef CONFIG_STRICT_MODULE_RWX
extern void set_all_modules_text_rw(void);
extern void set_all_modules_text_ro(void);
extern void module_enable_ro(const struct module *mod, bool after_init);

4
init/main.c
View File

@ -925,7 +925,7 @@ static int try_to_run_init_process(const char *init_filename)
static noinline void __init kernel_init_freeable(void);
#if defined(CONFIG_DEBUG_RODATA) || defined(CONFIG_DEBUG_SET_MODULE_RONX)
#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
bool rodata_enabled __ro_after_init = true;
static int __init set_debug_rodata(char *str)
{
@ -934,7 +934,7 @@ static int __init set_debug_rodata(char *str)
__setup("rodata=", set_debug_rodata);
#endif
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
static void mark_readonly(void)
{
if (rodata_enabled)

2
kernel/configs/android-recommended.config
View File

@ -11,7 +11,7 @@ CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=8192
CONFIG_COMPACTION=y
CONFIG_DEBUG_RODATA=y
CONFIG_STRICT_KERNEL_RWX=y
CONFIG_DM_CRYPT=y
CONFIG_DM_UEVENT=y
CONFIG_DM_VERITY=y

6
kernel/module.c
View File

@ -74,9 +74,9 @@
/*
* Modules' sections will be aligned on page boundaries
* to ensure complete separation of code and data, but
* only when CONFIG_DEBUG_SET_MODULE_RONX=y
* only when CONFIG_STRICT_MODULE_RWX=y
*/
#ifdef CONFIG_DEBUG_SET_MODULE_RONX
#ifdef CONFIG_STRICT_MODULE_RWX
# define debug_align(X) ALIGN(X, PAGE_SIZE)
#else
# define debug_align(X) (X)
@ -1847,7 +1847,7 @@ static void mod_sysfs_teardown(struct module *mod)
mod_sysfs_fini(mod);
}
#ifdef CONFIG_DEBUG_SET_MODULE_RONX
#ifdef CONFIG_STRICT_MODULE_RWX
/*
* LKM RO/NX protection: protect module's text/ro-data
* from modification and any data from execution.

2
kernel/power/hibernate.c
View File

@ -1156,7 +1156,7 @@ static int __init hibernate_setup(char *str)
} else if (!strncmp(str, "no", 2)) {
noresume = 1;
nohibernate = 1;
} else if (IS_ENABLED(CONFIG_DEBUG_RODATA)
} else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
&& !strncmp(str, "protect_image", 13)) {
enable_restore_image_protection();
}

4
kernel/power/power.h
View File

@ -61,12 +61,12 @@ extern int hibernation_snapshot(int platform_mode);
extern int hibernation_restore(int platform_mode);
extern int hibernation_platform_enter(void);
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
/* kernel/power/snapshot.c */
extern void enable_restore_image_protection(void);
#else
static inline void enable_restore_image_protection(void) {}
#endif /* CONFIG_DEBUG_RODATA */
#endif /* CONFIG_STRICT_KERNEL_RWX */
#else /* !CONFIG_HIBERNATION */

4
kernel/power/snapshot.c
View File

@ -38,7 +38,7 @@
#include "power.h"
#ifdef CONFIG_DEBUG_RODATA
#ifdef CONFIG_STRICT_KERNEL_RWX
static bool hibernate_restore_protection;
static bool hibernate_restore_protection_active;
@ -73,7 +73,7 @@ static inline void hibernate_restore_protection_begin(void) {}
static inline void hibernate_restore_protection_end(void) {}
static inline void hibernate_restore_protect_page(void *page_address) {}
static inline void hibernate_restore_unprotect_page(void *page_address) {}
#endif /* CONFIG_DEBUG_RODATA */
#endif /* CONFIG_STRICT_KERNEL_RWX */
static int swsusp_page_is_free(struct page *);
static void swsusp_set_page_forbidden(struct page *);