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Message-ID: <095aa9a0-ef05-86a6-48f3-0a3208447654@linux.alibaba.com>
Date: Mon, 28 Dec 2020 15:24:38 +0800
From: wetp <wetp.zy@...ux.alibaba.com>
To: Jann Horn <jannh@...gle.com>, Thomas Gleixner <tglx@...utronix.de>,
Andy Lutomirski <luto@...nel.org>, kernel-hardening@...ts.openwall.com,
dvyukov@...gle.com, Masami Hiramatsu <mhiramat@...nel.org>,
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
"David S. Miller" <davem@...emloft.net>,
Alexander Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org,
Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 04/13] x86/extable: Introduce _ASM_EXTABLE_UA for uaccess
fixups
Please ingore this, so sorry to boring you.
On 2020/12/28 下午3:04, Wetp Zhang wrote:
> From: Jann Horn <jannh@...gle.com>
>
> fix #31317281
>
> commit 75045f77f7a73e617494d7a1fcf4e9c1849cec39 upstream
> Backport summary: Backport to kernel 4.19.57 to enhance MCA-R for copyin
>
> Currently, most fixups for attempting to access userspace memory are
> handled using _ASM_EXTABLE, which is also used for various other types of
> fixups (e.g. safe MSR access, IRET failures, and a bunch of other things).
> In order to make it possible to add special safety checks to uaccess fixups
> (in particular, checking whether the fault address is actually in
> userspace), introduce a new exception table handler ex_handler_uaccess()
> and wire it up to all the user access fixups (excluding ones that
> already use _ASM_EXTABLE_EX).
>
> Signed-off-by: Jann Horn <jannh@...gle.com>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Tested-by: Kees Cook <keescook@...omium.org>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: kernel-hardening@...ts.openwall.com
> Cc: dvyukov@...gle.com
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Cc: linux-fsdevel@...r.kernel.org
> Cc: Borislav Petkov <bp@...en8.de>
> Link: https://lkml.kernel.org/r/20180828201421.157735-5-jannh@google.com
> Signed-off-by: Youquan Song <youquan.song@...el.com>
> Signed-off-by: Wetp Zhang <wetp.zy@...ux.alibaba.com>
> ---
> arch/x86/include/asm/asm.h | 6 ++
> arch/x86/include/asm/futex.h | 6 +-
> arch/x86/include/asm/uaccess.h | 16 +++---
> arch/x86/lib/checksum_32.S | 4 +-
> arch/x86/lib/copy_user_64.S | 90 ++++++++++++++---------------
> arch/x86/lib/csum-copy_64.S | 8 ++-
> arch/x86/lib/getuser.S | 12 ++--
> arch/x86/lib/putuser.S | 10 ++--
> arch/x86/lib/usercopy_32.c | 126 ++++++++++++++++++++---------------------
> arch/x86/lib/usercopy_64.c | 4 +-
> arch/x86/mm/extable.c | 8 +++
> 11 files changed, 154 insertions(+), 136 deletions(-)
>
> diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
> index 990770f..13fe8d6 100644
> --- a/arch/x86/include/asm/asm.h
> +++ b/arch/x86/include/asm/asm.h
> @@ -130,6 +130,9 @@
> # define _ASM_EXTABLE(from, to) \
> _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
>
> +# define _ASM_EXTABLE_UA(from, to) \
> + _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
> +
> # define _ASM_EXTABLE_FAULT(from, to) \
> _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
>
> @@ -182,6 +185,9 @@
> # define _ASM_EXTABLE(from, to) \
> _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
>
> +# define _ASM_EXTABLE_UA(from, to) \
> + _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
> +
> # define _ASM_EXTABLE_FAULT(from, to) \
> _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
>
> diff --git a/arch/x86/include/asm/futex.h b/arch/x86/include/asm/futex.h
> index de4d688..13c83fe 100644
> --- a/arch/x86/include/asm/futex.h
> +++ b/arch/x86/include/asm/futex.h
> @@ -20,7 +20,7 @@
> "3:\tmov\t%3, %1\n" \
> "\tjmp\t2b\n" \
> "\t.previous\n" \
> - _ASM_EXTABLE(1b, 3b) \
> + _ASM_EXTABLE_UA(1b, 3b) \
> : "=r" (oldval), "=r" (ret), "+m" (*uaddr) \
> : "i" (-EFAULT), "0" (oparg), "1" (0))
>
> @@ -36,8 +36,8 @@
> "4:\tmov\t%5, %1\n" \
> "\tjmp\t3b\n" \
> "\t.previous\n" \
> - _ASM_EXTABLE(1b, 4b) \
> - _ASM_EXTABLE(2b, 4b) \
> + _ASM_EXTABLE_UA(1b, 4b) \
> + _ASM_EXTABLE_UA(2b, 4b) \
> : "=&a" (oldval), "=&r" (ret), \
> "+m" (*uaddr), "=&r" (tem) \
> : "r" (oparg), "i" (-EFAULT), "1" (0))
> diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
> index d7ccff5..58929cf 100644
> --- a/arch/x86/include/asm/uaccess.h
> +++ b/arch/x86/include/asm/uaccess.h
> @@ -198,8 +198,8 @@ static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, un
> "4: movl %3,%0\n" \
> " jmp 3b\n" \
> ".previous\n" \
> - _ASM_EXTABLE(1b, 4b) \
> - _ASM_EXTABLE(2b, 4b) \
> + _ASM_EXTABLE_UA(1b, 4b) \
> + _ASM_EXTABLE_UA(2b, 4b) \
> : "=r" (err) \
> : "A" (x), "r" (addr), "i" (errret), "0" (err))
>
> @@ -385,7 +385,7 @@ static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, un
> " xor"itype" %"rtype"1,%"rtype"1\n" \
> " jmp 2b\n" \
> ".previous\n" \
> - _ASM_EXTABLE(1b, 3b) \
> + _ASM_EXTABLE_UA(1b, 3b) \
> : "=r" (err), ltype(x) \
> : "m" (__m(addr)), "i" (errret), "0" (err))
>
> @@ -477,7 +477,7 @@ static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, un
> "3: mov %3,%0\n" \
> " jmp 2b\n" \
> ".previous\n" \
> - _ASM_EXTABLE(1b, 3b) \
> + _ASM_EXTABLE_UA(1b, 3b) \
> : "=r"(err) \
> : ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))
>
> @@ -605,7 +605,7 @@ extern void __cmpxchg_wrong_size(void)
> "3:\tmov %3, %0\n" \
> "\tjmp 2b\n" \
> "\t.previous\n" \
> - _ASM_EXTABLE(1b, 3b) \
> + _ASM_EXTABLE_UA(1b, 3b) \
> : "+r" (__ret), "=a" (__old), "+m" (*(ptr)) \
> : "i" (-EFAULT), "q" (__new), "1" (__old) \
> : "memory" \
> @@ -621,7 +621,7 @@ extern void __cmpxchg_wrong_size(void)
> "3:\tmov %3, %0\n" \
> "\tjmp 2b\n" \
> "\t.previous\n" \
> - _ASM_EXTABLE(1b, 3b) \
> + _ASM_EXTABLE_UA(1b, 3b) \
> : "+r" (__ret), "=a" (__old), "+m" (*(ptr)) \
> : "i" (-EFAULT), "r" (__new), "1" (__old) \
> : "memory" \
> @@ -637,7 +637,7 @@ extern void __cmpxchg_wrong_size(void)
> "3:\tmov %3, %0\n" \
> "\tjmp 2b\n" \
> "\t.previous\n" \
> - _ASM_EXTABLE(1b, 3b) \
> + _ASM_EXTABLE_UA(1b, 3b) \
> : "+r" (__ret), "=a" (__old), "+m" (*(ptr)) \
> : "i" (-EFAULT), "r" (__new), "1" (__old) \
> : "memory" \
> @@ -656,7 +656,7 @@ extern void __cmpxchg_wrong_size(void)
> "3:\tmov %3, %0\n" \
> "\tjmp 2b\n" \
> "\t.previous\n" \
> - _ASM_EXTABLE(1b, 3b) \
> + _ASM_EXTABLE_UA(1b, 3b) \
> : "+r" (__ret), "=a" (__old), "+m" (*(ptr)) \
> : "i" (-EFAULT), "r" (__new), "1" (__old) \
> : "memory" \
> diff --git a/arch/x86/lib/checksum_32.S b/arch/x86/lib/checksum_32.S
> index 46e71a7..ad8e090 100644
> --- a/arch/x86/lib/checksum_32.S
> +++ b/arch/x86/lib/checksum_32.S
> @@ -273,11 +273,11 @@ unsigned int csum_partial_copy_generic (const char *src, char *dst,
>
> #define SRC(y...) \
> 9999: y; \
> - _ASM_EXTABLE(9999b, 6001f)
> + _ASM_EXTABLE_UA(9999b, 6001f)
>
> #define DST(y...) \
> 9999: y; \
> - _ASM_EXTABLE(9999b, 6002f)
> + _ASM_EXTABLE_UA(9999b, 6002f)
>
> #ifndef CONFIG_X86_USE_PPRO_CHECKSUM
>
> diff --git a/arch/x86/lib/copy_user_64.S b/arch/x86/lib/copy_user_64.S
> index 020f75c..80cfad6 100644
> --- a/arch/x86/lib/copy_user_64.S
> +++ b/arch/x86/lib/copy_user_64.S
> @@ -92,26 +92,26 @@ ENTRY(copy_user_generic_unrolled)
> 60: jmp copy_user_handle_tail /* ecx is zerorest also */
> .previous
>
> - _ASM_EXTABLE(1b,30b)
> - _ASM_EXTABLE(2b,30b)
> - _ASM_EXTABLE(3b,30b)
> - _ASM_EXTABLE(4b,30b)
> - _ASM_EXTABLE(5b,30b)
> - _ASM_EXTABLE(6b,30b)
> - _ASM_EXTABLE(7b,30b)
> - _ASM_EXTABLE(8b,30b)
> - _ASM_EXTABLE(9b,30b)
> - _ASM_EXTABLE(10b,30b)
> - _ASM_EXTABLE(11b,30b)
> - _ASM_EXTABLE(12b,30b)
> - _ASM_EXTABLE(13b,30b)
> - _ASM_EXTABLE(14b,30b)
> - _ASM_EXTABLE(15b,30b)
> - _ASM_EXTABLE(16b,30b)
> - _ASM_EXTABLE(18b,40b)
> - _ASM_EXTABLE(19b,40b)
> - _ASM_EXTABLE(21b,50b)
> - _ASM_EXTABLE(22b,50b)
> + _ASM_EXTABLE_UA(1b,30b)
> + _ASM_EXTABLE_UA(2b,30b)
> + _ASM_EXTABLE_UA(3b,30b)
> + _ASM_EXTABLE_UA(4b,30b)
> + _ASM_EXTABLE_UA(5b,30b)
> + _ASM_EXTABLE_UA(6b,30b)
> + _ASM_EXTABLE_UA(7b,30b)
> + _ASM_EXTABLE_UA(8b,30b)
> + _ASM_EXTABLE_UA(9b,30b)
> + _ASM_EXTABLE_UA(10b,30b)
> + _ASM_EXTABLE_UA(11b,30b)
> + _ASM_EXTABLE_UA(12b,30b)
> + _ASM_EXTABLE_UA(13b,30b)
> + _ASM_EXTABLE_UA(14b,30b)
> + _ASM_EXTABLE_UA(15b,30b)
> + _ASM_EXTABLE_UA(16b,30b)
> + _ASM_EXTABLE_UA(18b,40b)
> + _ASM_EXTABLE_UA(19b,40b)
> + _ASM_EXTABLE_UA(21b,50b)
> + _ASM_EXTABLE_UA(22b,50b)
> ENDPROC(copy_user_generic_unrolled)
> EXPORT_SYMBOL(copy_user_generic_unrolled)
>
> @@ -156,8 +156,8 @@ ENTRY(copy_user_generic_string)
> jmp copy_user_handle_tail
> .previous
>
> - _ASM_EXTABLE(1b,11b)
> - _ASM_EXTABLE(3b,12b)
> + _ASM_EXTABLE_UA(1b,11b)
> + _ASM_EXTABLE_UA(3b,12b)
> ENDPROC(copy_user_generic_string)
> EXPORT_SYMBOL(copy_user_generic_string)
>
> @@ -189,7 +189,7 @@ ENTRY(copy_user_enhanced_fast_string)
> jmp copy_user_handle_tail
> .previous
>
> - _ASM_EXTABLE(1b,12b)
> + _ASM_EXTABLE_UA(1b,12b)
> ENDPROC(copy_user_enhanced_fast_string)
> EXPORT_SYMBOL(copy_user_enhanced_fast_string)
>
> @@ -319,27 +319,27 @@ ENTRY(__copy_user_nocache)
> jmp copy_user_handle_tail
> .previous
>
> - _ASM_EXTABLE(1b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(2b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(3b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(4b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(5b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(6b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(7b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(8b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(9b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(10b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(11b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(12b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(13b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(14b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(15b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(16b,.L_fixup_4x8b_copy)
> - _ASM_EXTABLE(20b,.L_fixup_8b_copy)
> - _ASM_EXTABLE(21b,.L_fixup_8b_copy)
> - _ASM_EXTABLE(30b,.L_fixup_4b_copy)
> - _ASM_EXTABLE(31b,.L_fixup_4b_copy)
> - _ASM_EXTABLE(40b,.L_fixup_1b_copy)
> - _ASM_EXTABLE(41b,.L_fixup_1b_copy)
> + _ASM_EXTABLE_UA(1b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(2b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(3b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(4b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(5b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(6b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(7b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(8b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(9b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(10b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(11b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(12b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(13b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(14b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(15b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(16b,.L_fixup_4x8b_copy)
> + _ASM_EXTABLE_UA(20b,.L_fixup_8b_copy)
> + _ASM_EXTABLE_UA(21b,.L_fixup_8b_copy)
> + _ASM_EXTABLE_UA(30b,.L_fixup_4b_copy)
> + _ASM_EXTABLE_UA(31b,.L_fixup_4b_copy)
> + _ASM_EXTABLE_UA(40b,.L_fixup_1b_copy)
> + _ASM_EXTABLE_UA(41b,.L_fixup_1b_copy)
> ENDPROC(__copy_user_nocache)
> EXPORT_SYMBOL(__copy_user_nocache)
> diff --git a/arch/x86/lib/csum-copy_64.S b/arch/x86/lib/csum-copy_64.S
> index 45a53df..a4a379e 100644
> --- a/arch/x86/lib/csum-copy_64.S
> +++ b/arch/x86/lib/csum-copy_64.S
> @@ -31,14 +31,18 @@
>
> .macro source
> 10:
> - _ASM_EXTABLE(10b, .Lbad_source)
> + _ASM_EXTABLE_UA(10b, .Lbad_source)
> .endm
>
> .macro dest
> 20:
> - _ASM_EXTABLE(20b, .Lbad_dest)
> + _ASM_EXTABLE_UA(20b, .Lbad_dest)
> .endm
>
> + /*
> + * No _ASM_EXTABLE_UA; this is used for intentional prefetch on a
> + * potentially unmapped kernel address.
> + */
> .macro ignore L=.Lignore
> 30:
> _ASM_EXTABLE(30b, \L)
> diff --git a/arch/x86/lib/getuser.S b/arch/x86/lib/getuser.S
> index 49b167f..74fdff9 100644
> --- a/arch/x86/lib/getuser.S
> +++ b/arch/x86/lib/getuser.S
> @@ -132,12 +132,12 @@ bad_get_user_8:
> END(bad_get_user_8)
> #endif
>
> - _ASM_EXTABLE(1b,bad_get_user)
> - _ASM_EXTABLE(2b,bad_get_user)
> - _ASM_EXTABLE(3b,bad_get_user)
> + _ASM_EXTABLE_UA(1b, bad_get_user)
> + _ASM_EXTABLE_UA(2b, bad_get_user)
> + _ASM_EXTABLE_UA(3b, bad_get_user)
> #ifdef CONFIG_X86_64
> - _ASM_EXTABLE(4b,bad_get_user)
> + _ASM_EXTABLE_UA(4b, bad_get_user)
> #else
> - _ASM_EXTABLE(4b,bad_get_user_8)
> - _ASM_EXTABLE(5b,bad_get_user_8)
> + _ASM_EXTABLE_UA(4b, bad_get_user_8)
> + _ASM_EXTABLE_UA(5b, bad_get_user_8)
> #endif
> diff --git a/arch/x86/lib/putuser.S b/arch/x86/lib/putuser.S
> index 96dce5fe..d2e5c9c 100644
> --- a/arch/x86/lib/putuser.S
> +++ b/arch/x86/lib/putuser.S
> @@ -94,10 +94,10 @@ bad_put_user:
> EXIT
> END(bad_put_user)
>
> - _ASM_EXTABLE(1b,bad_put_user)
> - _ASM_EXTABLE(2b,bad_put_user)
> - _ASM_EXTABLE(3b,bad_put_user)
> - _ASM_EXTABLE(4b,bad_put_user)
> + _ASM_EXTABLE_UA(1b, bad_put_user)
> + _ASM_EXTABLE_UA(2b, bad_put_user)
> + _ASM_EXTABLE_UA(3b, bad_put_user)
> + _ASM_EXTABLE_UA(4b, bad_put_user)
> #ifdef CONFIG_X86_32
> - _ASM_EXTABLE(5b,bad_put_user)
> + _ASM_EXTABLE_UA(5b, bad_put_user)
> #endif
> diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c
> index 7add8ba..71fb58d 100644
> --- a/arch/x86/lib/usercopy_32.c
> +++ b/arch/x86/lib/usercopy_32.c
> @@ -47,8 +47,8 @@ static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned lon
> "3: lea 0(%2,%0,4),%0\n" \
> " jmp 2b\n" \
> ".previous\n" \
> - _ASM_EXTABLE(0b,3b) \
> - _ASM_EXTABLE(1b,2b) \
> + _ASM_EXTABLE_UA(0b, 3b) \
> + _ASM_EXTABLE_UA(1b, 2b) \
> : "=&c"(size), "=&D" (__d0) \
> : "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \
> } while (0)
> @@ -153,44 +153,44 @@ static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned lon
> "101: lea 0(%%eax,%0,4),%0\n"
> " jmp 100b\n"
> ".previous\n"
> - _ASM_EXTABLE(1b,100b)
> - _ASM_EXTABLE(2b,100b)
> - _ASM_EXTABLE(3b,100b)
> - _ASM_EXTABLE(4b,100b)
> - _ASM_EXTABLE(5b,100b)
> - _ASM_EXTABLE(6b,100b)
> - _ASM_EXTABLE(7b,100b)
> - _ASM_EXTABLE(8b,100b)
> - _ASM_EXTABLE(9b,100b)
> - _ASM_EXTABLE(10b,100b)
> - _ASM_EXTABLE(11b,100b)
> - _ASM_EXTABLE(12b,100b)
> - _ASM_EXTABLE(13b,100b)
> - _ASM_EXTABLE(14b,100b)
> - _ASM_EXTABLE(15b,100b)
> - _ASM_EXTABLE(16b,100b)
> - _ASM_EXTABLE(17b,100b)
> - _ASM_EXTABLE(18b,100b)
> - _ASM_EXTABLE(19b,100b)
> - _ASM_EXTABLE(20b,100b)
> - _ASM_EXTABLE(21b,100b)
> - _ASM_EXTABLE(22b,100b)
> - _ASM_EXTABLE(23b,100b)
> - _ASM_EXTABLE(24b,100b)
> - _ASM_EXTABLE(25b,100b)
> - _ASM_EXTABLE(26b,100b)
> - _ASM_EXTABLE(27b,100b)
> - _ASM_EXTABLE(28b,100b)
> - _ASM_EXTABLE(29b,100b)
> - _ASM_EXTABLE(30b,100b)
> - _ASM_EXTABLE(31b,100b)
> - _ASM_EXTABLE(32b,100b)
> - _ASM_EXTABLE(33b,100b)
> - _ASM_EXTABLE(34b,100b)
> - _ASM_EXTABLE(35b,100b)
> - _ASM_EXTABLE(36b,100b)
> - _ASM_EXTABLE(37b,100b)
> - _ASM_EXTABLE(99b,101b)
> + _ASM_EXTABLE_UA(1b, 100b)
> + _ASM_EXTABLE_UA(2b, 100b)
> + _ASM_EXTABLE_UA(3b, 100b)
> + _ASM_EXTABLE_UA(4b, 100b)
> + _ASM_EXTABLE_UA(5b, 100b)
> + _ASM_EXTABLE_UA(6b, 100b)
> + _ASM_EXTABLE_UA(7b, 100b)
> + _ASM_EXTABLE_UA(8b, 100b)
> + _ASM_EXTABLE_UA(9b, 100b)
> + _ASM_EXTABLE_UA(10b, 100b)
> + _ASM_EXTABLE_UA(11b, 100b)
> + _ASM_EXTABLE_UA(12b, 100b)
> + _ASM_EXTABLE_UA(13b, 100b)
> + _ASM_EXTABLE_UA(14b, 100b)
> + _ASM_EXTABLE_UA(15b, 100b)
> + _ASM_EXTABLE_UA(16b, 100b)
> + _ASM_EXTABLE_UA(17b, 100b)
> + _ASM_EXTABLE_UA(18b, 100b)
> + _ASM_EXTABLE_UA(19b, 100b)
> + _ASM_EXTABLE_UA(20b, 100b)
> + _ASM_EXTABLE_UA(21b, 100b)
> + _ASM_EXTABLE_UA(22b, 100b)
> + _ASM_EXTABLE_UA(23b, 100b)
> + _ASM_EXTABLE_UA(24b, 100b)
> + _ASM_EXTABLE_UA(25b, 100b)
> + _ASM_EXTABLE_UA(26b, 100b)
> + _ASM_EXTABLE_UA(27b, 100b)
> + _ASM_EXTABLE_UA(28b, 100b)
> + _ASM_EXTABLE_UA(29b, 100b)
> + _ASM_EXTABLE_UA(30b, 100b)
> + _ASM_EXTABLE_UA(31b, 100b)
> + _ASM_EXTABLE_UA(32b, 100b)
> + _ASM_EXTABLE_UA(33b, 100b)
> + _ASM_EXTABLE_UA(34b, 100b)
> + _ASM_EXTABLE_UA(35b, 100b)
> + _ASM_EXTABLE_UA(36b, 100b)
> + _ASM_EXTABLE_UA(37b, 100b)
> + _ASM_EXTABLE_UA(99b, 101b)
> : "=&c"(size), "=&D" (d0), "=&S" (d1)
> : "1"(to), "2"(from), "0"(size)
> : "eax", "edx", "memory");
> @@ -259,26 +259,26 @@ static unsigned long __copy_user_intel_nocache(void *to,
> "9: lea 0(%%eax,%0,4),%0\n"
> "16: jmp 8b\n"
> ".previous\n"
> - _ASM_EXTABLE(0b,16b)
> - _ASM_EXTABLE(1b,16b)
> - _ASM_EXTABLE(2b,16b)
> - _ASM_EXTABLE(21b,16b)
> - _ASM_EXTABLE(3b,16b)
> - _ASM_EXTABLE(31b,16b)
> - _ASM_EXTABLE(4b,16b)
> - _ASM_EXTABLE(41b,16b)
> - _ASM_EXTABLE(10b,16b)
> - _ASM_EXTABLE(51b,16b)
> - _ASM_EXTABLE(11b,16b)
> - _ASM_EXTABLE(61b,16b)
> - _ASM_EXTABLE(12b,16b)
> - _ASM_EXTABLE(71b,16b)
> - _ASM_EXTABLE(13b,16b)
> - _ASM_EXTABLE(81b,16b)
> - _ASM_EXTABLE(14b,16b)
> - _ASM_EXTABLE(91b,16b)
> - _ASM_EXTABLE(6b,9b)
> - _ASM_EXTABLE(7b,16b)
> + _ASM_EXTABLE_UA(0b, 16b)
> + _ASM_EXTABLE_UA(1b, 16b)
> + _ASM_EXTABLE_UA(2b, 16b)
> + _ASM_EXTABLE_UA(21b, 16b)
> + _ASM_EXTABLE_UA(3b, 16b)
> + _ASM_EXTABLE_UA(31b, 16b)
> + _ASM_EXTABLE_UA(4b, 16b)
> + _ASM_EXTABLE_UA(41b, 16b)
> + _ASM_EXTABLE_UA(10b, 16b)
> + _ASM_EXTABLE_UA(51b, 16b)
> + _ASM_EXTABLE_UA(11b, 16b)
> + _ASM_EXTABLE_UA(61b, 16b)
> + _ASM_EXTABLE_UA(12b, 16b)
> + _ASM_EXTABLE_UA(71b, 16b)
> + _ASM_EXTABLE_UA(13b, 16b)
> + _ASM_EXTABLE_UA(81b, 16b)
> + _ASM_EXTABLE_UA(14b, 16b)
> + _ASM_EXTABLE_UA(91b, 16b)
> + _ASM_EXTABLE_UA(6b, 9b)
> + _ASM_EXTABLE_UA(7b, 16b)
> : "=&c"(size), "=&D" (d0), "=&S" (d1)
> : "1"(to), "2"(from), "0"(size)
> : "eax", "edx", "memory");
> @@ -321,9 +321,9 @@ unsigned long __copy_user_intel(void __user *to, const void *from,
> "3: lea 0(%3,%0,4),%0\n" \
> " jmp 2b\n" \
> ".previous\n" \
> - _ASM_EXTABLE(4b,5b) \
> - _ASM_EXTABLE(0b,3b) \
> - _ASM_EXTABLE(1b,2b) \
> + _ASM_EXTABLE_UA(4b, 5b) \
> + _ASM_EXTABLE_UA(0b, 3b) \
> + _ASM_EXTABLE_UA(1b, 2b) \
> : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
> : "3"(size), "0"(size), "1"(to), "2"(from) \
> : "memory"); \
> diff --git a/arch/x86/lib/usercopy_64.c b/arch/x86/lib/usercopy_64.c
> index 9c5606d..fefe6443 100644
> --- a/arch/x86/lib/usercopy_64.c
> +++ b/arch/x86/lib/usercopy_64.c
> @@ -37,8 +37,8 @@ unsigned long __clear_user(void __user *addr, unsigned long size)
> "3: lea 0(%[size1],%[size8],8),%[size8]\n"
> " jmp 2b\n"
> ".previous\n"
> - _ASM_EXTABLE(0b,3b)
> - _ASM_EXTABLE(1b,2b)
> + _ASM_EXTABLE_UA(0b, 3b)
> + _ASM_EXTABLE_UA(1b, 2b)
> : [size8] "=&c"(size), [dst] "=&D" (__d0)
> : [size1] "r"(size & 7), "[size8]" (size / 8), "[dst]"(addr));
> clac();
> diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
> index 45f5d6c..dc72b2d 100644
> --- a/arch/x86/mm/extable.c
> +++ b/arch/x86/mm/extable.c
> @@ -108,6 +108,14 @@ __visible bool ex_handler_fprestore(const struct exception_table_entry *fixup,
> }
> EXPORT_SYMBOL_GPL(ex_handler_fprestore);
>
> +bool ex_handler_uaccess(const struct exception_table_entry *fixup,
> + struct pt_regs *regs, int trapnr)
> +{
> + regs->ip = ex_fixup_addr(fixup);
> + return true;
> +}
> +EXPORT_SYMBOL(ex_handler_uaccess);
> +
> __visible bool ex_handler_ext(const struct exception_table_entry *fixup,
> struct pt_regs *regs, int trapnr)
> {
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