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author | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-09 19:28:23 -0400 |
---|---|---|
committer | Ben Hutchings <ben@decadent.org.uk> | 2016-11-20 01:01:41 +0000 |
commit | 2932d54120f2642568c77608bc8753e9114f9647 (patch) | |
tree | 316bd2745589a55ad9dae7072761e13b0471bdfb /arch | |
parent | e17dc9d350ba0dfc8662b4fb968c1a32d600d27b (diff) | |
download | linux-stable-2932d54120f2642568c77608bc8753e9114f9647.tar.gz linux-stable-2932d54120f2642568c77608bc8753e9114f9647.tar.bz2 linux-stable-2932d54120f2642568c77608bc8753e9114f9647.zip |
avr32: fix copy_from_user()
commit 8630c32275bac2de6ffb8aea9d9b11663e7ad28e upstream.
really ugly, but apparently avr32 compilers turns access_ok() into
something so bad that they want it in assembler. Left that way,
zeroing added in inline wrapper.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/avr32/include/asm/uaccess.h | 11 | ||||
-rw-r--r-- | arch/avr32/kernel/avr32_ksyms.c | 2 | ||||
-rw-r--r-- | arch/avr32/lib/copy_user.S | 4 |
3 files changed, 13 insertions, 4 deletions
diff --git a/arch/avr32/include/asm/uaccess.h b/arch/avr32/include/asm/uaccess.h index 245b2ee213c9..a0a9b8c31041 100644 --- a/arch/avr32/include/asm/uaccess.h +++ b/arch/avr32/include/asm/uaccess.h @@ -74,7 +74,7 @@ extern __kernel_size_t __copy_user(void *to, const void *from, extern __kernel_size_t copy_to_user(void __user *to, const void *from, __kernel_size_t n); -extern __kernel_size_t copy_from_user(void *to, const void __user *from, +extern __kernel_size_t ___copy_from_user(void *to, const void __user *from, __kernel_size_t n); static inline __kernel_size_t __copy_to_user(void __user *to, const void *from, @@ -88,6 +88,15 @@ static inline __kernel_size_t __copy_from_user(void *to, { return __copy_user(to, (const void __force *)from, n); } +static inline __kernel_size_t copy_from_user(void *to, + const void __user *from, + __kernel_size_t n) +{ + size_t res = ___copy_from_user(to, from, n); + if (unlikely(res)) + memset(to + (n - res), 0, res); + return res; +} #define __copy_to_user_inatomic __copy_to_user #define __copy_from_user_inatomic __copy_from_user diff --git a/arch/avr32/kernel/avr32_ksyms.c b/arch/avr32/kernel/avr32_ksyms.c index d93ead02daed..7c6cf14f0985 100644 --- a/arch/avr32/kernel/avr32_ksyms.c +++ b/arch/avr32/kernel/avr32_ksyms.c @@ -36,7 +36,7 @@ EXPORT_SYMBOL(copy_page); /* * Userspace access stuff. */ -EXPORT_SYMBOL(copy_from_user); +EXPORT_SYMBOL(___copy_from_user); EXPORT_SYMBOL(copy_to_user); EXPORT_SYMBOL(__copy_user); EXPORT_SYMBOL(strncpy_from_user); diff --git a/arch/avr32/lib/copy_user.S b/arch/avr32/lib/copy_user.S index ea59c04b07de..96a6de9d578f 100644 --- a/arch/avr32/lib/copy_user.S +++ b/arch/avr32/lib/copy_user.S @@ -25,11 +25,11 @@ .align 1 .global copy_from_user .type copy_from_user, @function -copy_from_user: +___copy_from_user: branch_if_kernel r8, __copy_user ret_if_privileged r8, r11, r10, r10 rjmp __copy_user - .size copy_from_user, . - copy_from_user + .size ___copy_from_user, . - ___copy_from_user .global copy_to_user .type copy_to_user, @function |