diff options
Diffstat (limited to 'arch/s390/lib/uaccess.c')
| -rw-r--r-- | arch/s390/lib/uaccess.c | 81 |
1 files changed, 63 insertions, 18 deletions
diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c index 8a5d21461889..b709239feb5d 100644 --- a/arch/s390/lib/uaccess.c +++ b/arch/s390/lib/uaccess.c @@ -59,11 +59,13 @@ static inline int copy_with_mvcos(void) #endif static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr, - unsigned long size) + unsigned long size, unsigned long key) { unsigned long tmp1, tmp2; union oac spec = { + .oac2.key = key, .oac2.as = PSW_BITS_AS_SECONDARY, + .oac2.k = 1, .oac2.a = 1, }; @@ -94,19 +96,19 @@ static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr } static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr, - unsigned long size) + unsigned long size, unsigned long key) { unsigned long tmp1, tmp2; tmp1 = -256UL; asm volatile( " sacf 0\n" - "0: mvcp 0(%0,%2),0(%1),%3\n" + "0: mvcp 0(%0,%2),0(%1),%[key]\n" "7: jz 5f\n" "1: algr %0,%3\n" " la %1,256(%1)\n" " la %2,256(%2)\n" - "2: mvcp 0(%0,%2),0(%1),%3\n" + "2: mvcp 0(%0,%2),0(%1),%[key]\n" "8: jnz 1b\n" " j 5f\n" "3: la %4,255(%1)\n" /* %4 = ptr + 255 */ @@ -115,7 +117,7 @@ static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr, " slgr %4,%1\n" " clgr %0,%4\n" /* copy crosses next page boundary? */ " jnh 6f\n" - "4: mvcp 0(%4,%2),0(%1),%3\n" + "4: mvcp 0(%4,%2),0(%1),%[key]\n" "9: slgr %0,%4\n" " j 6f\n" "5: slgr %0,%0\n" @@ -123,24 +125,49 @@ static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr, EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b) EX_TABLE(7b,3b) EX_TABLE(8b,3b) EX_TABLE(9b,6b) : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) - : : "cc", "memory"); + : [key] "d" (key << 4) + : "cc", "memory"); return size; } -unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) +static unsigned long raw_copy_from_user_key(void *to, const void __user *from, + unsigned long n, unsigned long key) { if (copy_with_mvcos()) - return copy_from_user_mvcos(to, from, n); - return copy_from_user_mvcp(to, from, n); + return copy_from_user_mvcos(to, from, n, key); + return copy_from_user_mvcp(to, from, n, key); +} + +unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) +{ + return raw_copy_from_user_key(to, from, n, 0); } EXPORT_SYMBOL(raw_copy_from_user); +unsigned long _copy_from_user_key(void *to, const void __user *from, + unsigned long n, unsigned long key) +{ + unsigned long res = n; + + might_fault(); + if (!should_fail_usercopy()) { + instrument_copy_from_user(to, from, n); + res = raw_copy_from_user_key(to, from, n, key); + } + if (unlikely(res)) + memset(to + (n - res), 0, res); + return res; +} +EXPORT_SYMBOL(_copy_from_user_key); + static inline unsigned long copy_to_user_mvcos(void __user *ptr, const void *x, - unsigned long size) + unsigned long size, unsigned long key) { unsigned long tmp1, tmp2; union oac spec = { + .oac1.key = key, .oac1.as = PSW_BITS_AS_SECONDARY, + .oac1.k = 1, .oac1.a = 1, }; @@ -171,19 +198,19 @@ static inline unsigned long copy_to_user_mvcos(void __user *ptr, const void *x, } static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x, - unsigned long size) + unsigned long size, unsigned long key) { unsigned long tmp1, tmp2; tmp1 = -256UL; asm volatile( " sacf 0\n" - "0: mvcs 0(%0,%1),0(%2),%3\n" + "0: mvcs 0(%0,%1),0(%2),%[key]\n" "7: jz 5f\n" "1: algr %0,%3\n" " la %1,256(%1)\n" " la %2,256(%2)\n" - "2: mvcs 0(%0,%1),0(%2),%3\n" + "2: mvcs 0(%0,%1),0(%2),%[key]\n" "8: jnz 1b\n" " j 5f\n" "3: la %4,255(%1)\n" /* %4 = ptr + 255 */ @@ -192,7 +219,7 @@ static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x, " slgr %4,%1\n" " clgr %0,%4\n" /* copy crosses next page boundary? */ " jnh 6f\n" - "4: mvcs 0(%4,%1),0(%2),%3\n" + "4: mvcs 0(%4,%1),0(%2),%[key]\n" "9: slgr %0,%4\n" " j 6f\n" "5: slgr %0,%0\n" @@ -200,18 +227,36 @@ static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x, EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b) EX_TABLE(7b,3b) EX_TABLE(8b,3b) EX_TABLE(9b,6b) : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) - : : "cc", "memory"); + : [key] "d" (key << 4) + : "cc", "memory"); return size; } -unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n) +static unsigned long raw_copy_to_user_key(void __user *to, const void *from, + unsigned long n, unsigned long key) { if (copy_with_mvcos()) - return copy_to_user_mvcos(to, from, n); - return copy_to_user_mvcs(to, from, n); + return copy_to_user_mvcos(to, from, n, key); + return copy_to_user_mvcs(to, from, n, key); +} + +unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n) +{ + return raw_copy_to_user_key(to, from, n, 0); } EXPORT_SYMBOL(raw_copy_to_user); +unsigned long _copy_to_user_key(void __user *to, const void *from, + unsigned long n, unsigned long key) +{ + might_fault(); + if (should_fail_usercopy()) + return n; + instrument_copy_to_user(to, from, n); + return raw_copy_to_user_key(to, from, n, key); +} +EXPORT_SYMBOL(_copy_to_user_key); + static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size) { unsigned long tmp1, tmp2; |