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This continues the pattern of VMA heavy lifting being done in mm/vma.c in an environment where it can be subject to straightforward unit and regression testing, with other VMA-adjacent files becoming wrappers around this functionality. Signed-off-by: Lorenzo Stoakes Signed-off-by: Lorenzo Stoakes --- mm/mmap.c | 85 +------------------------------- mm/vma.c | 82 ++++++++++++++++++++++++++++++ mm/vma.h | 3 ++ tools/testing/vma/vma_internal.h | 22 +++++++++ 4 files changed, 108 insertions(+), 84 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 16f8e8be01f8..93188ef46dae 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -111,8 +111,7 @@ static int check_brk_limits(unsigned long addr, unsigned long len) return mlock_future_ok(current->mm, current->mm->def_flags, len) ? 0 : -EAGAIN; } -static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *brkvma, - unsigned long addr, unsigned long request, unsigned long flags); + SYSCALL_DEFINE1(brk, unsigned long, brk) { unsigned long newbrk, oldbrk, origbrk; @@ -1512,88 +1511,6 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, return ret; } -/* - * do_brk_flags() - Increase the brk vma if the flags match. - * @vmi: The vma iterator - * @addr: The start address - * @len: The length of the increase - * @vma: The vma, - * @flags: The VMA Flags - * - * Extend the brk VMA from addr to addr + len. If the VMA is NULL or the flags - * do not match then create a new anonymous VMA. Eventually we may be able to - * do some brk-specific accounting here. - */ -static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma, - unsigned long addr, unsigned long len, unsigned long flags) -{ - struct mm_struct *mm = current->mm; - - /* - * Check against address space limits by the changed size - * Note: This happens *after* clearing old mappings in some code paths. - */ - flags |= VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags; - if (!may_expand_vm(mm, flags, len >> PAGE_SHIFT)) - return -ENOMEM; - - if (mm->map_count > sysctl_max_map_count) - return -ENOMEM; - - if (security_vm_enough_memory_mm(mm, len >> PAGE_SHIFT)) - return -ENOMEM; - - /* - * Expand the existing vma if possible; Note that singular lists do not - * occur after forking, so the expand will only happen on new VMAs. - */ - if (vma && vma->vm_end == addr) { - VMG_STATE(vmg, mm, vmi, addr, addr + len, flags, PHYS_PFN(addr)); - - vmg.prev = vma; - /* vmi is positioned at prev, which this mode expects. */ - vmg.merge_flags = VMG_FLAG_JUST_EXPAND; - - if (vma_merge_new_range(&vmg)) - goto out; - else if (vmg_nomem(&vmg)) - goto unacct_fail; - } - - if (vma) - vma_iter_next_range(vmi); - /* create a vma struct for an anonymous mapping */ - vma = vm_area_alloc(mm); - if (!vma) - goto unacct_fail; - - vma_set_anonymous(vma); - vma_set_range(vma, addr, addr + len, addr >> PAGE_SHIFT); - vm_flags_init(vma, flags); - vma->vm_page_prot = vm_get_page_prot(flags); - vma_start_write(vma); - if (vma_iter_store_gfp(vmi, vma, GFP_KERNEL)) - goto mas_store_fail; - - mm->map_count++; - validate_mm(mm); - ksm_add_vma(vma); -out: - perf_event_mmap(vma); - mm->total_vm += len >> PAGE_SHIFT; - mm->data_vm += len >> PAGE_SHIFT; - if (flags & VM_LOCKED) - mm->locked_vm += (len >> PAGE_SHIFT); - vm_flags_set(vma, VM_SOFTDIRTY); - return 0; - -mas_store_fail: - vm_area_free(vma); -unacct_fail: - vm_unacct_memory(len >> PAGE_SHIFT); - return -ENOMEM; -} - int vm_brk_flags(unsigned long addr, unsigned long request, unsigned long flags) { struct mm_struct *mm = current->mm; diff --git a/mm/vma.c b/mm/vma.c index 8e31b7e25aeb..9955b5332ca2 100644 --- a/mm/vma.c +++ b/mm/vma.c @@ -2478,3 +2478,85 @@ unsigned long __mmap_region(struct file *file, unsigned long addr, vms_abort_munmap_vmas(&map.vms, &map.mas_detach); return error; } + +/* + * do_brk_flags() - Increase the brk vma if the flags match. + * @vmi: The vma iterator + * @addr: The start address + * @len: The length of the increase + * @vma: The vma, + * @flags: The VMA Flags + * + * Extend the brk VMA from addr to addr + len. If the VMA is NULL or the flags + * do not match then create a new anonymous VMA. Eventually we may be able to + * do some brk-specific accounting here. + */ +int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma, + unsigned long addr, unsigned long len, unsigned long flags) +{ + struct mm_struct *mm = current->mm; + + /* + * Check against address space limits by the changed size + * Note: This happens *after* clearing old mappings in some code paths. + */ + flags |= VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags; + if (!may_expand_vm(mm, flags, len >> PAGE_SHIFT)) + return -ENOMEM; + + if (mm->map_count > sysctl_max_map_count) + return -ENOMEM; + + if (security_vm_enough_memory_mm(mm, len >> PAGE_SHIFT)) + return -ENOMEM; + + /* + * Expand the existing vma if possible; Note that singular lists do not + * occur after forking, so the expand will only happen on new VMAs. + */ + if (vma && vma->vm_end == addr) { + VMG_STATE(vmg, mm, vmi, addr, addr + len, flags, PHYS_PFN(addr)); + + vmg.prev = vma; + /* vmi is positioned at prev, which this mode expects. */ + vmg.merge_flags = VMG_FLAG_JUST_EXPAND; + + if (vma_merge_new_range(&vmg)) + goto out; + else if (vmg_nomem(&vmg)) + goto unacct_fail; + } + + if (vma) + vma_iter_next_range(vmi); + /* create a vma struct for an anonymous mapping */ + vma = vm_area_alloc(mm); + if (!vma) + goto unacct_fail; + + vma_set_anonymous(vma); + vma_set_range(vma, addr, addr + len, addr >> PAGE_SHIFT); + vm_flags_init(vma, flags); + vma->vm_page_prot = vm_get_page_prot(flags); + vma_start_write(vma); + if (vma_iter_store_gfp(vmi, vma, GFP_KERNEL)) + goto mas_store_fail; + + mm->map_count++; + validate_mm(mm); + ksm_add_vma(vma); +out: + perf_event_mmap(vma); + mm->total_vm += len >> PAGE_SHIFT; + mm->data_vm += len >> PAGE_SHIFT; + if (flags & VM_LOCKED) + mm->locked_vm += (len >> PAGE_SHIFT); + vm_flags_set(vma, VM_SOFTDIRTY); + return 0; + +mas_store_fail: + vm_area_free(vma); +unacct_fail: + vm_unacct_memory(len >> PAGE_SHIFT); + return -ENOMEM; +} diff --git a/mm/vma.h b/mm/vma.h index 388d34748674..83a15d3a8285 100644 --- a/mm/vma.h +++ b/mm/vma.h @@ -247,6 +247,9 @@ unsigned long __mmap_region(struct file *file, unsigned long addr, unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, struct list_head *uf); +int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *brkvma, + unsigned long addr, unsigned long request, unsigned long flags); + static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma) { /* diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h index e76ff579e1fd..7c3c15135c5b 100644 --- a/tools/testing/vma/vma_internal.h +++ b/tools/testing/vma/vma_internal.h @@ -39,6 +39,7 @@ #define VM_SHARED 0x00000008 #define VM_MAYREAD 0x00000010 #define VM_MAYWRITE 0x00000020 +#define VM_MAYEXEC 0x00000040 #define VM_GROWSDOWN 0x00000100 #define VM_PFNMAP 0x00000400 #define VM_LOCKED 0x00002000 @@ -58,6 +59,13 @@ /* This mask represents all the VMA flag bits used by mlock */ #define VM_LOCKED_MASK (VM_LOCKED | VM_LOCKONFAULT) +#define TASK_EXEC ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) + +#define VM_DATA_FLAGS_TSK_EXEC (VM_READ | VM_WRITE | TASK_EXEC | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC + #ifdef CONFIG_64BIT /* VM is sealed, in vm_flags */ #define VM_SEALED _BITUL(63) @@ -122,10 +130,22 @@ enum { TASK_COMM_LEN = 16, }; +/* + * Flags for bug emulation. + * + * These occupy the top three bytes. + */ +enum { + READ_IMPLIES_EXEC = 0x0400000, +}; + struct task_struct { char comm[TASK_COMM_LEN]; pid_t pid; struct mm_struct *mm; + + /* Used for emulating ABI behavior of previous Linux versions: */ + unsigned int personality; }; struct task_struct *get_current(void); @@ -186,6 +206,8 @@ struct mm_struct { unsigned long data_vm; /* VM_WRITE & ~VM_SHARED & ~VM_STACK */ unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE & ~VM_STACK */ unsigned long stack_vm; /* VM_STACK */ + + unsigned long def_flags; }; struct vma_lock { From patchwork Tue Dec 3 18:05:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Stoakes X-Patchwork-Id: 13892796 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0BB33E74AC8 for ; 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Tue, 3 Dec 2024 18:05:33 +0000 From: Lorenzo Stoakes To: Andrew Morton Cc: "Liam R . Howlett" , Vlastimil Babka , Jann Horn , Eric Biederman , Kees Cook , Alexander Viro , Christian Brauner , Jan Kara , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/5] mm/vma: move unmapped_area() internals to mm/vma.c Date: Tue, 3 Dec 2024 18:05:09 +0000 Message-ID: <53a57a52a64ea54e9d129d2e2abca3a538022379.1733248985.git.lorenzo.stoakes@oracle.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: References: X-ClientProxiedBy: LO4P265CA0156.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:2c7::18) To BYAPR10MB3366.namprd10.prod.outlook.com (2603:10b6:a03:14f::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR10MB3366:EE_|CH3PR10MB6762:EE_ X-MS-Office365-Filtering-Correlation-Id: 71f13595-baee-447d-8a23-08dd13c5146f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|366016|1800799024; X-Microsoft-Antispam-Message-Info: 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The wrappers which invoke this remain in place in mm/mmap.c. In addition, naturally, update the existing test code to enable this to be compiled in userland. Signed-off-by: Lorenzo Stoakes --- mm/mmap.c | 109 ------------------------------- mm/vma.c | 109 +++++++++++++++++++++++++++++++ mm/vma.h | 3 + tools/testing/vma/vma.c | 6 ++ tools/testing/vma/vma_internal.h | 59 +++++++++++++++++ 5 files changed, 177 insertions(+), 109 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 93188ef46dae..f053de1d6fae 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -580,115 +580,6 @@ SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg) } #endif /* __ARCH_WANT_SYS_OLD_MMAP */ -/** - * unmapped_area() - Find an area between the low_limit and the high_limit with - * the correct alignment and offset, all from @info. Note: current->mm is used - * for the search. - * - * @info: The unmapped area information including the range [low_limit - - * high_limit), the alignment offset and mask. - * - * Return: A memory address or -ENOMEM. - */ -static unsigned long unmapped_area(struct vm_unmapped_area_info *info) -{ - unsigned long length, gap; - unsigned long low_limit, high_limit; - struct vm_area_struct *tmp; - VMA_ITERATOR(vmi, current->mm, 0); - - /* Adjust search length to account for worst case alignment overhead */ - length = info->length + info->align_mask + info->start_gap; - if (length < info->length) - return -ENOMEM; - - low_limit = info->low_limit; - if (low_limit < mmap_min_addr) - low_limit = mmap_min_addr; - high_limit = info->high_limit; -retry: - if (vma_iter_area_lowest(&vmi, low_limit, high_limit, length)) - return -ENOMEM; - - /* - * Adjust for the gap first so it doesn't interfere with the - * later alignment. The first step is the minimum needed to - * fulill the start gap, the next steps is the minimum to align - * that. It is the minimum needed to fulill both. - */ - gap = vma_iter_addr(&vmi) + info->start_gap; - gap += (info->align_offset - gap) & info->align_mask; - tmp = vma_next(&vmi); - if (tmp && (tmp->vm_flags & VM_STARTGAP_FLAGS)) { /* Avoid prev check if possible */ - if (vm_start_gap(tmp) < gap + length - 1) { - low_limit = tmp->vm_end; - vma_iter_reset(&vmi); - goto retry; - } - } else { - tmp = vma_prev(&vmi); - if (tmp && vm_end_gap(tmp) > gap) { - low_limit = vm_end_gap(tmp); - vma_iter_reset(&vmi); - goto retry; - } - } - - return gap; -} - -/** - * unmapped_area_topdown() - Find an area between the low_limit and the - * high_limit with the correct alignment and offset at the highest available - * address, all from @info. Note: current->mm is used for the search. - * - * @info: The unmapped area information including the range [low_limit - - * high_limit), the alignment offset and mask. - * - * Return: A memory address or -ENOMEM. - */ -static unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info) -{ - unsigned long length, gap, gap_end; - unsigned long low_limit, high_limit; - struct vm_area_struct *tmp; - VMA_ITERATOR(vmi, current->mm, 0); - - /* Adjust search length to account for worst case alignment overhead */ - length = info->length + info->align_mask + info->start_gap; - if (length < info->length) - return -ENOMEM; - - low_limit = info->low_limit; - if (low_limit < mmap_min_addr) - low_limit = mmap_min_addr; - high_limit = info->high_limit; -retry: - if (vma_iter_area_highest(&vmi, low_limit, high_limit, length)) - return -ENOMEM; - - gap = vma_iter_end(&vmi) - info->length; - gap -= (gap - info->align_offset) & info->align_mask; - gap_end = vma_iter_end(&vmi); - tmp = vma_next(&vmi); - if (tmp && (tmp->vm_flags & VM_STARTGAP_FLAGS)) { /* Avoid prev check if possible */ - if (vm_start_gap(tmp) < gap_end) { - high_limit = vm_start_gap(tmp); - vma_iter_reset(&vmi); - goto retry; - } - } else { - tmp = vma_prev(&vmi); - if (tmp && vm_end_gap(tmp) > gap) { - high_limit = tmp->vm_start; - vma_iter_reset(&vmi); - goto retry; - } - } - - return gap; -} - /* * Determine if the allocation needs to ensure that there is no * existing mapping within it's guard gaps, for use as start_gap. diff --git a/mm/vma.c b/mm/vma.c index 9955b5332ca2..50c0c9c443d2 100644 --- a/mm/vma.c +++ b/mm/vma.c @@ -2560,3 +2560,112 @@ int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma, vm_unacct_memory(len >> PAGE_SHIFT); return -ENOMEM; } + +/** + * unmapped_area() - Find an area between the low_limit and the high_limit with + * the correct alignment and offset, all from @info. Note: current->mm is used + * for the search. + * + * @info: The unmapped area information including the range [low_limit - + * high_limit), the alignment offset and mask. + * + * Return: A memory address or -ENOMEM. + */ +unsigned long unmapped_area(struct vm_unmapped_area_info *info) +{ + unsigned long length, gap; + unsigned long low_limit, high_limit; + struct vm_area_struct *tmp; + VMA_ITERATOR(vmi, current->mm, 0); + + /* Adjust search length to account for worst case alignment overhead */ + length = info->length + info->align_mask + info->start_gap; + if (length < info->length) + return -ENOMEM; + + low_limit = info->low_limit; + if (low_limit < mmap_min_addr) + low_limit = mmap_min_addr; + high_limit = info->high_limit; +retry: + if (vma_iter_area_lowest(&vmi, low_limit, high_limit, length)) + return -ENOMEM; + + /* + * Adjust for the gap first so it doesn't interfere with the + * later alignment. The first step is the minimum needed to + * fulill the start gap, the next steps is the minimum to align + * that. It is the minimum needed to fulill both. + */ + gap = vma_iter_addr(&vmi) + info->start_gap; + gap += (info->align_offset - gap) & info->align_mask; + tmp = vma_next(&vmi); + if (tmp && (tmp->vm_flags & VM_STARTGAP_FLAGS)) { /* Avoid prev check if possible */ + if (vm_start_gap(tmp) < gap + length - 1) { + low_limit = tmp->vm_end; + vma_iter_reset(&vmi); + goto retry; + } + } else { + tmp = vma_prev(&vmi); + if (tmp && vm_end_gap(tmp) > gap) { + low_limit = vm_end_gap(tmp); + vma_iter_reset(&vmi); + goto retry; + } + } + + return gap; +} + +/** + * unmapped_area_topdown() - Find an area between the low_limit and the + * high_limit with the correct alignment and offset at the highest available + * address, all from @info. Note: current->mm is used for the search. + * + * @info: The unmapped area information including the range [low_limit - + * high_limit), the alignment offset and mask. + * + * Return: A memory address or -ENOMEM. + */ +unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info) +{ + unsigned long length, gap, gap_end; + unsigned long low_limit, high_limit; + struct vm_area_struct *tmp; + VMA_ITERATOR(vmi, current->mm, 0); + + /* Adjust search length to account for worst case alignment overhead */ + length = info->length + info->align_mask + info->start_gap; + if (length < info->length) + return -ENOMEM; + + low_limit = info->low_limit; + if (low_limit < mmap_min_addr) + low_limit = mmap_min_addr; + high_limit = info->high_limit; +retry: + if (vma_iter_area_highest(&vmi, low_limit, high_limit, length)) + return -ENOMEM; + + gap = vma_iter_end(&vmi) - info->length; + gap -= (gap - info->align_offset) & info->align_mask; + gap_end = vma_iter_end(&vmi); + tmp = vma_next(&vmi); + if (tmp && (tmp->vm_flags & VM_STARTGAP_FLAGS)) { /* Avoid prev check if possible */ + if (vm_start_gap(tmp) < gap_end) { + high_limit = vm_start_gap(tmp); + vma_iter_reset(&vmi); + goto retry; + } + } else { + tmp = vma_prev(&vmi); + if (tmp && vm_end_gap(tmp) > gap) { + high_limit = tmp->vm_start; + vma_iter_reset(&vmi); + goto retry; + } + } + + return gap; +} diff --git a/mm/vma.h b/mm/vma.h index 83a15d3a8285..c60f37d89eb1 100644 --- a/mm/vma.h +++ b/mm/vma.h @@ -250,6 +250,9 @@ unsigned long __mmap_region(struct file *file, unsigned long addr, int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *brkvma, unsigned long addr, unsigned long request, unsigned long flags); +unsigned long unmapped_area(struct vm_unmapped_area_info *info); +unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); + static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma) { /* diff --git a/tools/testing/vma/vma.c b/tools/testing/vma/vma.c index 8fab5e13c7c3..39ee61e55634 100644 --- a/tools/testing/vma/vma.c +++ b/tools/testing/vma/vma.c @@ -18,6 +18,12 @@ static bool fail_prealloc; #define vma_iter_prealloc(vmi, vma) \ (fail_prealloc ? -ENOMEM : mas_preallocate(&(vmi)->mas, (vma), GFP_KERNEL)) +#define CONFIG_DEFAULT_MMAP_MIN_ADDR 65536 + +unsigned long mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR; +unsigned long dac_mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR; +unsigned long stack_guard_gap = 256UL< #include +extern unsigned long stack_guard_gap; +#ifdef CONFIG_MMU +extern unsigned long mmap_min_addr; +extern unsigned long dac_mmap_min_addr; +#else +#define mmap_min_addr 0UL +#define dac_mmap_min_addr 0UL +#endif + #define VM_WARN_ON(_expr) (WARN_ON(_expr)) #define VM_WARN_ON_ONCE(_expr) (WARN_ON_ONCE(_expr)) #define VM_BUG_ON(_expr) (BUG_ON(_expr)) @@ -52,6 +61,8 @@ #define VM_STACK VM_GROWSDOWN #define VM_SHADOW_STACK VM_NONE #define VM_SOFTDIRTY 0 +#define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ +#define VM_GROWSUP VM_NONE #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC) #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) @@ -66,6 +77,8 @@ #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC +#define VM_STARTGAP_FLAGS (VM_GROWSDOWN | VM_SHADOW_STACK) + #ifdef CONFIG_64BIT /* VM is sealed, in vm_flags */ #define VM_SEALED _BITUL(63) @@ -395,6 +408,17 @@ struct vm_operations_struct { unsigned long addr); }; +struct vm_unmapped_area_info { +#define VM_UNMAPPED_AREA_TOPDOWN 1 + unsigned long flags; + unsigned long length; + unsigned long low_limit; + unsigned long high_limit; + unsigned long align_mask; + unsigned long align_offset; + unsigned long start_gap; +}; + static inline void vma_iter_invalidate(struct vma_iterator *vmi) { mas_pause(&vmi->mas); @@ -1055,4 +1079,39 @@ static inline int mmap_file(struct file *, struct vm_area_struct *) return 0; } +static inline unsigned long stack_guard_start_gap(struct vm_area_struct *vma) +{ + if (vma->vm_flags & VM_GROWSDOWN) + return stack_guard_gap; + + /* See reasoning around the VM_SHADOW_STACK definition */ + if (vma->vm_flags & VM_SHADOW_STACK) + return PAGE_SIZE; + + return 0; +} + +static inline unsigned long vm_start_gap(struct vm_area_struct *vma) +{ + unsigned long gap = stack_guard_start_gap(vma); + unsigned long vm_start = vma->vm_start; + + vm_start -= gap; + if (vm_start > vma->vm_start) + vm_start = 0; + return vm_start; +} + +static inline unsigned long vm_end_gap(struct vm_area_struct *vma) +{ + unsigned long vm_end = vma->vm_end; 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get_user_pages_remote(). In order to be able to move the stack expansion logic into mm/vma.c in order to make it available to userland testing we need to find an alternative approach here. We do so by providing the mmap_read_lock_maybe_expand() function which also helpfully documents what get_arg_page() is doing here and adds an additional check against VM_GROWSDOWN to make explicit that the stack expansion logic is only invoked when the VMA is indeed a downward-growing stack. This allows expand_downwards() to become a static function. Importantly, the VMA referenced by mmap_read_maybe_expand() must NOT be currently user-visible in any way, that is place within an rmap or VMA tree. It must be a newly allocated VMA. This is the case when exec invokes this function. Signed-off-by: Lorenzo Stoakes --- fs/exec.c | 14 +++--------- include/linux/mm.h | 5 ++--- mm/mmap.c | 54 +++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 58 insertions(+), 15 deletions(-) diff --git a/fs/exec.c b/fs/exec.c index 98cb7ba9983c..1e1f79c514de 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -205,18 +205,10 @@ static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, /* * Avoid relying on expanding the stack down in GUP (which * does not work for STACK_GROWSUP anyway), and just do it - * by hand ahead of time. + * ahead of time. */ - if (write && pos < vma->vm_start) { - mmap_write_lock(mm); - ret = expand_downwards(vma, pos); - if (unlikely(ret < 0)) { - mmap_write_unlock(mm); - return NULL; - } - mmap_write_downgrade(mm); - } else - mmap_read_lock(mm); + if (!mmap_read_lock_maybe_expand(mm, vma, pos, write)) + return NULL; /* * We are doing an exec(). 'current' is the process diff --git a/include/linux/mm.h b/include/linux/mm.h index 4eb8e62d5c67..48312a934454 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3313,6 +3313,8 @@ extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admi extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); extern void exit_mmap(struct mm_struct *); int relocate_vma_down(struct vm_area_struct *vma, unsigned long shift); +bool mmap_read_lock_maybe_expand(struct mm_struct *mm, struct vm_area_struct *vma, + unsigned long addr, bool write); static inline int check_data_rlimit(unsigned long rlim, unsigned long new, @@ -3426,9 +3428,6 @@ extern unsigned long stack_guard_gap; int expand_stack_locked(struct vm_area_struct *vma, unsigned long address); struct vm_area_struct *expand_stack(struct mm_struct * mm, unsigned long addr); -/* CONFIG_STACK_GROWSUP still needs to grow downwards at some places */ -int expand_downwards(struct vm_area_struct *vma, unsigned long address); - /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, diff --git a/mm/mmap.c b/mm/mmap.c index f053de1d6fae..4df38d3717ff 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1009,7 +1009,7 @@ static int expand_upwards(struct vm_area_struct *vma, unsigned long address) * vma is the first one with address < vma->vm_start. Have to extend vma. * mmap_lock held for writing. */ -int expand_downwards(struct vm_area_struct *vma, unsigned long address) +static int expand_downwards(struct vm_area_struct *vma, unsigned long address) { struct mm_struct *mm = vma->vm_mm; struct vm_area_struct *prev; @@ -1940,3 +1940,55 @@ int relocate_vma_down(struct vm_area_struct *vma, unsigned long shift) /* Shrink the vma to just the new range */ return vma_shrink(&vmi, vma, new_start, new_end, vma->vm_pgoff); } + +#ifdef CONFIG_MMU +/* + * Obtain a read lock on mm->mmap_lock, if the specified address is below the + * start of the VMA, the intent is to perform a write, and it is a + * downward-growing stack, then attempt to expand the stack to contain it. + * + * This function is intended only for obtaining an argument page from an ELF + * image, and is almost certainly NOT what you want to use for any other + * purpose. + * + * IMPORTANT - VMA fields are accessed without an mmap lock being held, so the + * VMA referenced must not be linked in any user-visible tree, i.e. it must be a + * new VMA being mapped. + * + * The function assumes that addr is either contained within the VMA or below + * it, and makes no attempt to validate this value beyond that. + * + * Returns true if the read lock was obtained and a stack was perhaps expanded, + * false if the stack expansion failed. + * + * On stack expansion the function temporarily acquires an mmap write lock + * before downgrading it. + */ +bool mmap_read_lock_maybe_expand(struct mm_struct *mm, + struct vm_area_struct *new_vma, + unsigned long addr, bool write) +{ + if (!write || addr >= new_vma->vm_start) { + mmap_read_lock(mm); + return true; + } + + if (!(new_vma->vm_flags & VM_GROWSDOWN)) + return false; + + mmap_write_lock(mm); + if (expand_downwards(new_vma, addr)) { + mmap_write_unlock(mm); + return false; + } + + mmap_write_downgrade(mm); + return true; +} +#else +bool mmap_read_lock_maybe_expand(struct mm_struct *mm, struct vm_area_struct *vma, + unsigned long addr, bool write) +{ + return false; +} +#endif From patchwork Tue Dec 3 18:05:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Stoakes X-Patchwork-Id: 13892795 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68AB6E74AC3 for ; Tue, 3 Dec 2024 18:05:53 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E7B266B0093; Tue, 3 Dec 2024 13:05:52 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E29306B008C; 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 nIxY6XPI 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This logic is subtle and so it is highly useful to get it into vma.c so we can then userland unit test. We must additionally move acct_stack_growth() to vma.c as it is a helper function used by both expand_downwards() and expand_upwards(). We are also then able to mark anon_vma_interval_tree_pre_update_vma() and anon_vma_interval_tree_post_update_vma() static as these are no longer used by anything else. Signed-off-by: Lorenzo Stoakes --- mm/mmap.c | 205 ----------------------- mm/vma.c | 269 +++++++++++++++++++++++++++---- mm/vma.h | 12 +- tools/testing/vma/vma.c | 5 + tools/testing/vma/vma_internal.h | 62 +++++++ 5 files changed, 310 insertions(+), 243 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 4df38d3717ff..55a8f2332b7c 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -879,211 +879,6 @@ find_vma_prev(struct mm_struct *mm, unsigned long addr, return vma; } -/* - * Verify that the stack growth is acceptable and - * update accounting. This is shared with both the - * grow-up and grow-down cases. - */ -static int acct_stack_growth(struct vm_area_struct *vma, - unsigned long size, unsigned long grow) -{ - struct mm_struct *mm = vma->vm_mm; - unsigned long new_start; - - /* address space limit tests */ - if (!may_expand_vm(mm, vma->vm_flags, grow)) - return -ENOMEM; - - /* Stack limit test */ - if (size > rlimit(RLIMIT_STACK)) - return -ENOMEM; - - /* mlock limit tests */ - if (!mlock_future_ok(mm, vma->vm_flags, grow << PAGE_SHIFT)) - return -ENOMEM; - - /* Check to ensure the stack will not grow into a hugetlb-only region */ - new_start = (vma->vm_flags & VM_GROWSUP) ? vma->vm_start : - vma->vm_end - size; - if (is_hugepage_only_range(vma->vm_mm, new_start, size)) - return -EFAULT; - - /* - * Overcommit.. This must be the final test, as it will - * update security statistics. - */ - if (security_vm_enough_memory_mm(mm, grow)) - return -ENOMEM; - - return 0; -} - -#if defined(CONFIG_STACK_GROWSUP) -/* - * PA-RISC uses this for its stack. - * vma is the last one with address > vma->vm_end. Have to extend vma. - */ -static int expand_upwards(struct vm_area_struct *vma, unsigned long address) -{ - struct mm_struct *mm = vma->vm_mm; - struct vm_area_struct *next; - unsigned long gap_addr; - int error = 0; - VMA_ITERATOR(vmi, mm, vma->vm_start); - - if (!(vma->vm_flags & VM_GROWSUP)) - return -EFAULT; - - mmap_assert_write_locked(mm); - - /* Guard against exceeding limits of the address space. */ - address &= PAGE_MASK; - if (address >= (TASK_SIZE & PAGE_MASK)) - return -ENOMEM; - address += PAGE_SIZE; - - /* Enforce stack_guard_gap */ - gap_addr = address + stack_guard_gap; - - /* Guard against overflow */ - if (gap_addr < address || gap_addr > TASK_SIZE) - gap_addr = TASK_SIZE; - - next = find_vma_intersection(mm, vma->vm_end, gap_addr); - if (next && vma_is_accessible(next)) { - if (!(next->vm_flags & VM_GROWSUP)) - return -ENOMEM; - /* Check that both stack segments have the same anon_vma? */ - } - - if (next) - vma_iter_prev_range_limit(&vmi, address); - - vma_iter_config(&vmi, vma->vm_start, address); - if (vma_iter_prealloc(&vmi, vma)) - return -ENOMEM; - - /* We must make sure the anon_vma is allocated. */ - if (unlikely(anon_vma_prepare(vma))) { - vma_iter_free(&vmi); - return -ENOMEM; - } - - /* Lock the VMA before expanding to prevent concurrent page faults */ - vma_start_write(vma); - /* We update the anon VMA tree. */ - anon_vma_lock_write(vma->anon_vma); - - /* Somebody else might have raced and expanded it already */ - if (address > vma->vm_end) { - unsigned long size, grow; - - size = address - vma->vm_start; - grow = (address - vma->vm_end) >> PAGE_SHIFT; - - error = -ENOMEM; - if (vma->vm_pgoff + (size >> PAGE_SHIFT) >= vma->vm_pgoff) { - error = acct_stack_growth(vma, size, grow); - if (!error) { - if (vma->vm_flags & VM_LOCKED) - mm->locked_vm += grow; - vm_stat_account(mm, vma->vm_flags, grow); - anon_vma_interval_tree_pre_update_vma(vma); - vma->vm_end = address; - /* Overwrite old entry in mtree. */ - vma_iter_store(&vmi, vma); - anon_vma_interval_tree_post_update_vma(vma); - - perf_event_mmap(vma); - } - } - } - anon_vma_unlock_write(vma->anon_vma); - vma_iter_free(&vmi); - validate_mm(mm); - return error; -} -#endif /* CONFIG_STACK_GROWSUP */ - -/* - * vma is the first one with address < vma->vm_start. Have to extend vma. - * mmap_lock held for writing. - */ -static int expand_downwards(struct vm_area_struct *vma, unsigned long address) -{ - struct mm_struct *mm = vma->vm_mm; - struct vm_area_struct *prev; - int error = 0; - VMA_ITERATOR(vmi, mm, vma->vm_start); - - if (!(vma->vm_flags & VM_GROWSDOWN)) - return -EFAULT; - - mmap_assert_write_locked(mm); - - address &= PAGE_MASK; - if (address < mmap_min_addr || address < FIRST_USER_ADDRESS) - return -EPERM; - - /* Enforce stack_guard_gap */ - prev = vma_prev(&vmi); - /* Check that both stack segments have the same anon_vma? */ - if (prev) { - if (!(prev->vm_flags & VM_GROWSDOWN) && - vma_is_accessible(prev) && - (address - prev->vm_end < stack_guard_gap)) - return -ENOMEM; - } - - if (prev) - vma_iter_next_range_limit(&vmi, vma->vm_start); - - vma_iter_config(&vmi, address, vma->vm_end); - if (vma_iter_prealloc(&vmi, vma)) - return -ENOMEM; - - /* We must make sure the anon_vma is allocated. */ - if (unlikely(anon_vma_prepare(vma))) { - vma_iter_free(&vmi); - return -ENOMEM; - } - - /* Lock the VMA before expanding to prevent concurrent page faults */ - vma_start_write(vma); - /* We update the anon VMA tree. */ - anon_vma_lock_write(vma->anon_vma); - - /* Somebody else might have raced and expanded it already */ - if (address < vma->vm_start) { - unsigned long size, grow; - - size = vma->vm_end - address; - grow = (vma->vm_start - address) >> PAGE_SHIFT; - - error = -ENOMEM; - if (grow <= vma->vm_pgoff) { - error = acct_stack_growth(vma, size, grow); - if (!error) { - if (vma->vm_flags & VM_LOCKED) - mm->locked_vm += grow; - vm_stat_account(mm, vma->vm_flags, grow); - anon_vma_interval_tree_pre_update_vma(vma); - vma->vm_start = address; - vma->vm_pgoff -= grow; - /* Overwrite old entry in mtree. */ - vma_iter_store(&vmi, vma); - anon_vma_interval_tree_post_update_vma(vma); - - perf_event_mmap(vma); - } - } - } - anon_vma_unlock_write(vma->anon_vma); - vma_iter_free(&vmi); - validate_mm(mm); - return error; -} - /* enforced gap between the expanding stack and other mappings. */ unsigned long stack_guard_gap = 256UL<anon_vma_chain, same_vma) + anon_vma_interval_tree_remove(avc, &avc->anon_vma->rb_root); +} + +static void +anon_vma_interval_tree_post_update_vma(struct vm_area_struct *vma) +{ + struct anon_vma_chain *avc; + + list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) + anon_vma_interval_tree_insert(avc, &avc->anon_vma->rb_root); +} + /* * vma_prepare() - Helper function for handling locking VMAs prior to altering * @vp: The initialized vma_prepare struct @@ -510,38 +542,6 @@ static int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma, return __split_vma(vmi, vma, addr, new_below); } -/* - * vma has some anon_vma assigned, and is already inserted on that - * anon_vma's interval trees. - * - * Before updating the vma's vm_start / vm_end / vm_pgoff fields, the - * vma must be removed from the anon_vma's interval trees using - * anon_vma_interval_tree_pre_update_vma(). - * - * After the update, the vma will be reinserted using - * anon_vma_interval_tree_post_update_vma(). - * - * The entire update must be protected by exclusive mmap_lock and by - * the root anon_vma's mutex. - */ -void -anon_vma_interval_tree_pre_update_vma(struct vm_area_struct *vma) -{ - struct anon_vma_chain *avc; - - list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) - anon_vma_interval_tree_remove(avc, &avc->anon_vma->rb_root); -} - -void -anon_vma_interval_tree_post_update_vma(struct vm_area_struct *vma) -{ - struct anon_vma_chain *avc; - - list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) - anon_vma_interval_tree_insert(avc, &avc->anon_vma->rb_root); -} - /* * dup_anon_vma() - Helper function to duplicate anon_vma * @dst: The destination VMA @@ -2669,3 +2669,208 @@ unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info) return gap; } + +/* + * Verify that the stack growth is acceptable and + * update accounting. This is shared with both the + * grow-up and grow-down cases. + */ +static int acct_stack_growth(struct vm_area_struct *vma, + unsigned long size, unsigned long grow) +{ + struct mm_struct *mm = vma->vm_mm; + unsigned long new_start; + + /* address space limit tests */ + if (!may_expand_vm(mm, vma->vm_flags, grow)) + return -ENOMEM; + + /* Stack limit test */ + if (size > rlimit(RLIMIT_STACK)) + return -ENOMEM; + + /* mlock limit tests */ + if (!mlock_future_ok(mm, vma->vm_flags, grow << PAGE_SHIFT)) + return -ENOMEM; + + /* Check to ensure the stack will not grow into a hugetlb-only region */ + new_start = (vma->vm_flags & VM_GROWSUP) ? vma->vm_start : + vma->vm_end - size; + if (is_hugepage_only_range(vma->vm_mm, new_start, size)) + return -EFAULT; + + /* + * Overcommit.. This must be the final test, as it will + * update security statistics. + */ + if (security_vm_enough_memory_mm(mm, grow)) + return -ENOMEM; + + return 0; +} + +#if defined(CONFIG_STACK_GROWSUP) +/* + * PA-RISC uses this for its stack. + * vma is the last one with address > vma->vm_end. Have to extend vma. + */ +int expand_upwards(struct vm_area_struct *vma, unsigned long address) +{ + struct mm_struct *mm = vma->vm_mm; + struct vm_area_struct *next; + unsigned long gap_addr; + int error = 0; + VMA_ITERATOR(vmi, mm, vma->vm_start); + + if (!(vma->vm_flags & VM_GROWSUP)) + return -EFAULT; + + mmap_assert_write_locked(mm); + + /* Guard against exceeding limits of the address space. */ + address &= PAGE_MASK; + if (address >= (TASK_SIZE & PAGE_MASK)) + return -ENOMEM; + address += PAGE_SIZE; + + /* Enforce stack_guard_gap */ + gap_addr = address + stack_guard_gap; + + /* Guard against overflow */ + if (gap_addr < address || gap_addr > TASK_SIZE) + gap_addr = TASK_SIZE; + + next = find_vma_intersection(mm, vma->vm_end, gap_addr); + if (next && vma_is_accessible(next)) { + if (!(next->vm_flags & VM_GROWSUP)) + return -ENOMEM; + /* Check that both stack segments have the same anon_vma? */ + } + + if (next) + vma_iter_prev_range_limit(&vmi, address); + + vma_iter_config(&vmi, vma->vm_start, address); + if (vma_iter_prealloc(&vmi, vma)) + return -ENOMEM; + + /* We must make sure the anon_vma is allocated. */ + if (unlikely(anon_vma_prepare(vma))) { + vma_iter_free(&vmi); + return -ENOMEM; + } + + /* Lock the VMA before expanding to prevent concurrent page faults */ + vma_start_write(vma); + /* We update the anon VMA tree. */ + anon_vma_lock_write(vma->anon_vma); + + /* Somebody else might have raced and expanded it already */ + if (address > vma->vm_end) { + unsigned long size, grow; + + size = address - vma->vm_start; + grow = (address - vma->vm_end) >> PAGE_SHIFT; + + error = -ENOMEM; + if (vma->vm_pgoff + (size >> PAGE_SHIFT) >= vma->vm_pgoff) { + error = acct_stack_growth(vma, size, grow); + if (!error) { + if (vma->vm_flags & VM_LOCKED) + mm->locked_vm += grow; + vm_stat_account(mm, vma->vm_flags, grow); + anon_vma_interval_tree_pre_update_vma(vma); + vma->vm_end = address; + /* Overwrite old entry in mtree. */ + vma_iter_store(&vmi, vma); + anon_vma_interval_tree_post_update_vma(vma); + + perf_event_mmap(vma); + } + } + } + anon_vma_unlock_write(vma->anon_vma); + vma_iter_free(&vmi); + validate_mm(mm); + return error; +} +#endif /* CONFIG_STACK_GROWSUP */ + +/* + * vma is the first one with address < vma->vm_start. Have to extend vma. + * mmap_lock held for writing. + */ +int expand_downwards(struct vm_area_struct *vma, unsigned long address) +{ + struct mm_struct *mm = vma->vm_mm; + struct vm_area_struct *prev; + int error = 0; + VMA_ITERATOR(vmi, mm, vma->vm_start); + + if (!(vma->vm_flags & VM_GROWSDOWN)) + return -EFAULT; + + mmap_assert_write_locked(mm); + + address &= PAGE_MASK; + if (address < mmap_min_addr || address < FIRST_USER_ADDRESS) + return -EPERM; + + /* Enforce stack_guard_gap */ + prev = vma_prev(&vmi); + /* Check that both stack segments have the same anon_vma? */ + if (prev) { + if (!(prev->vm_flags & VM_GROWSDOWN) && + vma_is_accessible(prev) && + (address - prev->vm_end < stack_guard_gap)) + return -ENOMEM; + } + + if (prev) + vma_iter_next_range_limit(&vmi, vma->vm_start); + + vma_iter_config(&vmi, address, vma->vm_end); + if (vma_iter_prealloc(&vmi, vma)) + return -ENOMEM; + + /* We must make sure the anon_vma is allocated. */ + if (unlikely(anon_vma_prepare(vma))) { + vma_iter_free(&vmi); + return -ENOMEM; + } + + /* Lock the VMA before expanding to prevent concurrent page faults */ + vma_start_write(vma); + /* We update the anon VMA tree. */ + anon_vma_lock_write(vma->anon_vma); + + /* Somebody else might have raced and expanded it already */ + if (address < vma->vm_start) { + unsigned long size, grow; + + size = vma->vm_end - address; + grow = (vma->vm_start - address) >> PAGE_SHIFT; + + error = -ENOMEM; + if (grow <= vma->vm_pgoff) { + error = acct_stack_growth(vma, size, grow); + if (!error) { + if (vma->vm_flags & VM_LOCKED) + mm->locked_vm += grow; + vm_stat_account(mm, vma->vm_flags, grow); + anon_vma_interval_tree_pre_update_vma(vma); + vma->vm_start = address; + vma->vm_pgoff -= grow; + /* Overwrite old entry in mtree. */ + vma_iter_store(&vmi, vma); + anon_vma_interval_tree_post_update_vma(vma); + + perf_event_mmap(vma); + } + } + } + anon_vma_unlock_write(vma->anon_vma); + vma_iter_free(&vmi); + validate_mm(mm); + return error; +} diff --git a/mm/vma.h b/mm/vma.h index c60f37d89eb1..6c460a120f82 100644 --- a/mm/vma.h +++ b/mm/vma.h @@ -139,12 +139,6 @@ void validate_mm(struct mm_struct *mm); #define validate_mm(mm) do { } while (0) #endif -/* Required for expand_downwards(). */ -void anon_vma_interval_tree_pre_update_vma(struct vm_area_struct *vma); - -/* Required for expand_downwards(). */ -void anon_vma_interval_tree_post_update_vma(struct vm_area_struct *vma); - int vma_expand(struct vma_merge_struct *vmg); int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma, unsigned long start, unsigned long end, pgoff_t pgoff); @@ -478,4 +472,10 @@ static inline bool can_modify_vma_madv(struct vm_area_struct *vma, int behavior) #endif +#if defined(CONFIG_STACK_GROWSUP) +int expand_upwards(struct vm_area_struct *vma, unsigned long address); +#endif + +int expand_downwards(struct vm_area_struct *vma, unsigned long address); + #endif /* __MM_VMA_H */ diff --git a/tools/testing/vma/vma.c b/tools/testing/vma/vma.c index 39ee61e55634..891d87a9ad6b 100644 --- a/tools/testing/vma/vma.c +++ b/tools/testing/vma/vma.c @@ -53,6 +53,11 @@ struct task_struct *get_current(void) return &__current; } +unsigned long rlimit(unsigned int limit) +{ + return (unsigned long)-1; +} + /* Helper function to simply allocate a VMA. */ static struct vm_area_struct *alloc_vma(struct mm_struct *mm, unsigned long start, diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h index 6ad8bd8edaad..fab3f3bdf2f0 100644 --- a/tools/testing/vma/vma_internal.h +++ b/tools/testing/vma/vma_internal.h @@ -79,6 +79,11 @@ extern unsigned long dac_mmap_min_addr; #define VM_STARTGAP_FLAGS (VM_GROWSDOWN | VM_SHADOW_STACK) +#define RLIMIT_STACK 3 /* max stack size */ +#define RLIMIT_MEMLOCK 8 /* max locked-in-memory address space */ + +#define CAP_IPC_LOCK 14 + #ifdef CONFIG_64BIT /* VM is sealed, in vm_flags */ #define VM_SEALED _BITUL(63) @@ -478,6 +483,8 @@ static inline void vma_mark_detached(struct vm_area_struct *vma, bool detached) extern const struct vm_operations_struct vma_dummy_vm_ops; +extern unsigned long rlimit(unsigned int limit); + static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm) { memset(vma, 0, sizeof(*vma)); @@ -1114,4 +1121,59 @@ static inline unsigned long vm_end_gap(struct vm_area_struct *vma) return vm_end; } +static inline int is_hugepage_only_range(struct mm_struct *mm, + unsigned long addr, unsigned long len) +{ + return 0; +} + +static inline bool vma_is_accessible(struct vm_area_struct *vma) +{ + return vma->vm_flags & VM_ACCESS_FLAGS; +} + +static inline bool capable(int cap) +{ + return true; +} + +static inline bool mlock_future_ok(struct mm_struct *mm, unsigned long flags, + unsigned long bytes) +{ + unsigned long locked_pages, limit_pages; + + if (!(flags & VM_LOCKED) || capable(CAP_IPC_LOCK)) + return true; + + locked_pages = bytes >> PAGE_SHIFT; + locked_pages += mm->locked_vm; + + limit_pages = rlimit(RLIMIT_MEMLOCK); + limit_pages >>= PAGE_SHIFT; + + return locked_pages <= limit_pages; +} + +static inline int __anon_vma_prepare(struct vm_area_struct *vma) +{ + struct anon_vma *anon_vma = calloc(1, sizeof(struct anon_vma)); + + if (!anon_vma) + return -ENOMEM; + + anon_vma->root = anon_vma; + vma->anon_vma = anon_vma; + + return 0; +} + +static inline int anon_vma_prepare(struct vm_area_struct *vma) +{ + if (likely(vma->anon_vma)) + return 0; + + return __anon_vma_prepare(vma); +} + + #endif /* __MM_VMA_INTERNAL_H */ From patchwork Tue Dec 3 18:05:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Stoakes X-Patchwork-Id: 13892820 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3BA5DE74AC9 for ; Tue, 3 Dec 2024 19:11:44 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9CD8C6B0082; Tue, 3 Dec 2024 14:11:43 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9A3636B0085; Tue, 3 Dec 2024 14:11:43 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7CEFE6B0088; 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Signed-off-by: Lorenzo Stoakes --- mm/mmap.c | 18 ------------------ mm/vma.c | 18 ++++++++++++++++++ mm/vma.h | 2 ++ tools/testing/vma/vma_internal.h | 9 +++++++++ 4 files changed, 29 insertions(+), 18 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 55a8f2332b7c..1c6bdffa13dd 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1044,24 +1044,6 @@ unsigned long mmap_region(struct file *file, unsigned long addr, return ret; } -static int __vm_munmap(unsigned long start, size_t len, bool unlock) -{ - int ret; - struct mm_struct *mm = current->mm; - LIST_HEAD(uf); - VMA_ITERATOR(vmi, mm, start); - - if (mmap_write_lock_killable(mm)) - return -EINTR; - - ret = do_vmi_munmap(&vmi, mm, start, len, &uf, unlock); - if (ret || !unlock) - mmap_write_unlock(mm); - - userfaultfd_unmap_complete(mm, &uf); - return ret; -} - int vm_munmap(unsigned long start, size_t len) { return __vm_munmap(start, len, false); diff --git a/mm/vma.c b/mm/vma.c index 83c79bb42675..a06747845cac 100644 --- a/mm/vma.c +++ b/mm/vma.c @@ -2874,3 +2874,21 @@ int expand_downwards(struct vm_area_struct *vma, unsigned long address) validate_mm(mm); return error; } + +int __vm_munmap(unsigned long start, size_t len, bool unlock) +{ + int ret; + struct mm_struct *mm = current->mm; + LIST_HEAD(uf); + VMA_ITERATOR(vmi, mm, start); + + if (mmap_write_lock_killable(mm)) + return -EINTR; + + ret = do_vmi_munmap(&vmi, mm, start, len, &uf, unlock); + if (ret || !unlock) + mmap_write_unlock(mm); + + userfaultfd_unmap_complete(mm, &uf); + return ret; +} diff --git a/mm/vma.h b/mm/vma.h index 6c460a120f82..295d44ea54db 100644 --- a/mm/vma.h +++ b/mm/vma.h @@ -478,4 +478,6 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address); int expand_downwards(struct vm_area_struct *vma, unsigned long address); +int __vm_munmap(unsigned long start, size_t len, bool unlock); + #endif /* __MM_VMA_H */ diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h index fab3f3bdf2f0..a7de59a0d694 100644 --- a/tools/testing/vma/vma_internal.h +++ b/tools/testing/vma/vma_internal.h @@ -906,6 +906,11 @@ static inline void mmap_write_unlock(struct mm_struct *) { } +static inline int mmap_write_lock_killable(struct mm_struct *) +{ + return 0; +} + static inline bool can_modify_mm(struct mm_struct *mm, unsigned long start, unsigned long end) @@ -1175,5 +1180,9 @@ static inline int anon_vma_prepare(struct vm_area_struct *vma) return __anon_vma_prepare(vma); } +static inline void userfaultfd_unmap_complete(struct mm_struct *mm, + struct list_head *uf) +{ +} #endif /* __MM_VMA_INTERNAL_H */