| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds (pre-git) | 204 | 48.69% | 14 | 34.15% |
| Andrew Morton | 97 | 23.15% | 4 | 9.76% |
| Linus Torvalds | 24 | 5.73% | 5 | 12.20% |
| Neil Brown | 20 | 4.77% | 1 | 2.44% |
| Christoph Hellwig | 13 | 3.10% | 1 | 2.44% |
| Hiro Yoshioka | 12 | 2.86% | 1 | 2.44% |
| Alexey Dobriyan | 12 | 2.86% | 1 | 2.44% |
| H. Peter Anvin | 11 | 2.63% | 2 | 4.88% |
| Borislav Petkov | 4 | 0.95% | 1 | 2.44% |
| Dan J Williams | 4 | 0.95% | 2 | 4.88% |
| Peter Zijlstra | 4 | 0.95% | 1 | 2.44% |
| Ingo Molnar | 3 | 0.72% | 1 | 2.44% |
| Al Viro | 2 | 0.48% | 1 | 2.44% |
| Mika Kukkonen | 2 | 0.48% | 1 | 2.44% |
| Paolo Ciarrocchi | 2 | 0.48% | 1 | 2.44% |
| Mike Rapoport | 2 | 0.48% | 1 | 2.44% |
| Paul Gortmaker | 1 | 0.24% | 1 | 2.44% |
| Christoph Lameter | 1 | 0.24% | 1 | 2.44% |
| Greg Kroah-Hartman | 1 | 0.24% | 1 | 2.44% |
| Total | 419 | 41 |
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// SPDX-License-Identifier: GPL-2.0 /* * User address space access functions. * The non inlined parts of asm-i386/uaccess.h are here. * * Copyright 1997 Andi Kleen <ak@muc.de> * Copyright 1997 Linus Torvalds */ #include <linux/export.h> #include <linux/uaccess.h> #include <asm/asm.h> #ifdef CONFIG_X86_INTEL_USERCOPY /* * Alignment at which movsl is preferred for bulk memory copies. */ struct movsl_mask movsl_mask __read_mostly; #endif static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n) { #ifdef CONFIG_X86_INTEL_USERCOPY if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask)) return 0; #endif return 1; } #define movsl_is_ok(a1, a2, n) \ __movsl_is_ok((unsigned long)(a1), (unsigned long)(a2), (n)) /* * Zero Userspace */ #define __do_clear_user(addr,size) \ do { \ int __d0; \ might_fault(); \ __asm__ __volatile__( \ ASM_STAC "\n" \ "0: rep; stosl\n" \ " movl %2,%0\n" \ "1: rep; stosb\n" \ "2: " ASM_CLAC "\n" \ _ASM_EXTABLE_TYPE_REG(0b, 2b, EX_TYPE_UCOPY_LEN4, %2) \ _ASM_EXTABLE_UA(1b, 2b) \ : "=&c"(size), "=&D" (__d0) \ : "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \ } while (0) /** * clear_user - Zero a block of memory in user space. * @to: Destination address, in user space. * @n: Number of bytes to zero. * * Zero a block of memory in user space. * * Return: number of bytes that could not be cleared. * On success, this will be zero. */ unsigned long clear_user(void __user *to, unsigned long n) { might_fault(); if (access_ok(to, n)) __do_clear_user(to, n); return n; } EXPORT_SYMBOL(clear_user); /** * __clear_user - Zero a block of memory in user space, with less checking. * @to: Destination address, in user space. * @n: Number of bytes to zero. * * Zero a block of memory in user space. Caller must check * the specified block with access_ok() before calling this function. * * Return: number of bytes that could not be cleared. * On success, this will be zero. */ unsigned long __clear_user(void __user *to, unsigned long n) { __do_clear_user(to, n); return n; } EXPORT_SYMBOL(__clear_user); #ifdef CONFIG_X86_INTEL_USERCOPY static unsigned long __copy_user_intel(void __user *to, const void *from, unsigned long size) { int d0, d1; __asm__ __volatile__( " .align 2,0x90\n" "1: movl 32(%4), %%eax\n" " cmpl $67, %0\n" " jbe 3f\n" "2: movl 64(%4), %%eax\n" " .align 2,0x90\n" "3: movl 0(%4), %%eax\n" "4: movl 4(%4), %%edx\n" "5: movl %%eax, 0(%3)\n" "6: movl %%edx, 4(%3)\n" "7: movl 8(%4), %%eax\n" "8: movl 12(%4),%%edx\n" "9: movl %%eax, 8(%3)\n" "10: movl %%edx, 12(%3)\n" "11: movl 16(%4), %%eax\n" "12: movl 20(%4), %%edx\n" "13: movl %%eax, 16(%3)\n" "14: movl %%edx, 20(%3)\n" "15: movl 24(%4), %%eax\n" "16: movl 28(%4), %%edx\n" "17: movl %%eax, 24(%3)\n" "18: movl %%edx, 28(%3)\n" "19: movl 32(%4), %%eax\n" "20: movl 36(%4), %%edx\n" "21: movl %%eax, 32(%3)\n" "22: movl %%edx, 36(%3)\n" "23: movl 40(%4), %%eax\n" "24: movl 44(%4), %%edx\n" "25: movl %%eax, 40(%3)\n" "26: movl %%edx, 44(%3)\n" "27: movl 48(%4), %%eax\n" "28: movl 52(%4), %%edx\n" "29: movl %%eax, 48(%3)\n" "30: movl %%edx, 52(%3)\n" "31: movl 56(%4), %%eax\n" "32: movl 60(%4), %%edx\n" "33: movl %%eax, 56(%3)\n" "34: movl %%edx, 60(%3)\n" " addl $-64, %0\n" " addl $64, %4\n" " addl $64, %3\n" " cmpl $63, %0\n" " ja 1b\n" "35: movl %0, %%eax\n" " shrl $2, %0\n" " andl $3, %%eax\n" " cld\n" "99: rep; movsl\n" "36: movl %%eax, %0\n" "37: rep; movsb\n" "100:\n" _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_TYPE_REG(99b, 100b, EX_TYPE_UCOPY_LEN4, %%eax) : "=&c"(size), "=&D" (d0), "=&S" (d1) : "1"(to), "2"(from), "0"(size) : "eax", "edx", "memory"); return size; } static unsigned long __copy_user_intel_nocache(void *to, const void __user *from, unsigned long size) { int d0, d1; __asm__ __volatile__( " .align 2,0x90\n" "0: movl 32(%4), %%eax\n" " cmpl $67, %0\n" " jbe 2f\n" "1: movl 64(%4), %%eax\n" " .align 2,0x90\n" "2: movl 0(%4), %%eax\n" "21: movl 4(%4), %%edx\n" " movnti %%eax, 0(%3)\n" " movnti %%edx, 4(%3)\n" "3: movl 8(%4), %%eax\n" "31: movl 12(%4),%%edx\n" " movnti %%eax, 8(%3)\n" " movnti %%edx, 12(%3)\n" "4: movl 16(%4), %%eax\n" "41: movl 20(%4), %%edx\n" " movnti %%eax, 16(%3)\n" " movnti %%edx, 20(%3)\n" "10: movl 24(%4), %%eax\n" "51: movl 28(%4), %%edx\n" " movnti %%eax, 24(%3)\n" " movnti %%edx, 28(%3)\n" "11: movl 32(%4), %%eax\n" "61: movl 36(%4), %%edx\n" " movnti %%eax, 32(%3)\n" " movnti %%edx, 36(%3)\n" "12: movl 40(%4), %%eax\n" "71: movl 44(%4), %%edx\n" " movnti %%eax, 40(%3)\n" " movnti %%edx, 44(%3)\n" "13: movl 48(%4), %%eax\n" "81: movl 52(%4), %%edx\n" " movnti %%eax, 48(%3)\n" " movnti %%edx, 52(%3)\n" "14: movl 56(%4), %%eax\n" "91: movl 60(%4), %%edx\n" " movnti %%eax, 56(%3)\n" " movnti %%edx, 60(%3)\n" " addl $-64, %0\n" " addl $64, %4\n" " addl $64, %3\n" " cmpl $63, %0\n" " ja 0b\n" " sfence \n" "5: movl %0, %%eax\n" " shrl $2, %0\n" " andl $3, %%eax\n" " cld\n" "6: rep; movsl\n" " movl %%eax,%0\n" "7: rep; movsb\n" "8:\n" _ASM_EXTABLE_UA(0b, 8b) _ASM_EXTABLE_UA(1b, 8b) _ASM_EXTABLE_UA(2b, 8b) _ASM_EXTABLE_UA(21b, 8b) _ASM_EXTABLE_UA(3b, 8b) _ASM_EXTABLE_UA(31b, 8b) _ASM_EXTABLE_UA(4b, 8b) _ASM_EXTABLE_UA(41b, 8b) _ASM_EXTABLE_UA(10b, 8b) _ASM_EXTABLE_UA(51b, 8b) _ASM_EXTABLE_UA(11b, 8b) _ASM_EXTABLE_UA(61b, 8b) _ASM_EXTABLE_UA(12b, 8b) _ASM_EXTABLE_UA(71b, 8b) _ASM_EXTABLE_UA(13b, 8b) _ASM_EXTABLE_UA(81b, 8b) _ASM_EXTABLE_UA(14b, 8b) _ASM_EXTABLE_UA(91b, 8b) _ASM_EXTABLE_TYPE_REG(6b, 8b, EX_TYPE_UCOPY_LEN4, %%eax) _ASM_EXTABLE_UA(7b, 8b) : "=&c"(size), "=&D" (d0), "=&S" (d1) : "1"(to), "2"(from), "0"(size) : "eax", "edx", "memory"); return size; } #else /* * Leave these declared but undefined. They should not be any references to * them */ unsigned long __copy_user_intel(void __user *to, const void *from, unsigned long size); #endif /* CONFIG_X86_INTEL_USERCOPY */ /* Generic arbitrary sized copy. */ #define __copy_user(to, from, size) \ do { \ int __d0, __d1, __d2; \ __asm__ __volatile__( \ " cmp $7,%0\n" \ " jbe 1f\n" \ " movl %1,%0\n" \ " negl %0\n" \ " andl $7,%0\n" \ " subl %0,%3\n" \ "4: rep; movsb\n" \ " movl %3,%0\n" \ " shrl $2,%0\n" \ " andl $3,%3\n" \ " .align 2,0x90\n" \ "0: rep; movsl\n" \ " movl %3,%0\n" \ "1: rep; movsb\n" \ "2:\n" \ _ASM_EXTABLE_TYPE_REG(4b, 2b, EX_TYPE_UCOPY_LEN1, %3) \ _ASM_EXTABLE_TYPE_REG(0b, 2b, EX_TYPE_UCOPY_LEN4, %3) \ _ASM_EXTABLE_UA(1b, 2b) \ : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \ : "3"(size), "0"(size), "1"(to), "2"(from) \ : "memory"); \ } while (0) unsigned long __copy_user_ll(void *to, const void *from, unsigned long n) { __uaccess_begin_nospec(); if (movsl_is_ok(to, from, n)) __copy_user(to, from, n); else n = __copy_user_intel(to, from, n); __uaccess_end(); return n; } EXPORT_SYMBOL(__copy_user_ll); unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from, unsigned long n) { __uaccess_begin_nospec(); #ifdef CONFIG_X86_INTEL_USERCOPY if (n > 64 && static_cpu_has(X86_FEATURE_XMM2)) n = __copy_user_intel_nocache(to, from, n); else __copy_user(to, from, n); #else __copy_user(to, from, n); #endif __uaccess_end(); return n; } EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);
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