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mm, hugetlb: allow for "high" userspace addresses
commit5f24d5a579
upstream. This is a fix for commitf6795053da
("mm: mmap: Allow for "high" userspace addresses") for hugetlb. This patch adds support for "high" userspace addresses that are optionally supported on the system and have to be requested via a hint mechanism ("high" addr parameter to mmap). Architectures such as powerpc and x86 achieve this by making changes to their architectural versions of hugetlb_get_unmapped_area() function. However, arm64 uses the generic version of that function. So take into account arch_get_mmap_base() and arch_get_mmap_end() in hugetlb_get_unmapped_area(). To allow that, move those two macros out of mm/mmap.c into include/linux/sched/mm.h If these macros are not defined in architectural code then they default to (TASK_SIZE) and (base) so should not introduce any behavioural changes to architectures that do not define them. For the time being, only ARM64 is affected by this change. Catalin (ARM64) said "We should have fixed hugetlb_get_unmapped_area() as well when we added support for 52-bit VA. The reason for commitf6795053da
was to prevent normal mmap() from returning addresses above 48-bit by default as some user-space had hard assumptions about this. It's a slight ABI change if you do this for hugetlb_get_unmapped_area() but I doubt anyone would notice. It's more likely that the current behaviour would cause issues, so I'd rather have them consistent. Basically when arm64 gained support for 52-bit addresses we did not want user-space calling mmap() to suddenly get such high addresses, otherwise we could have inadvertently broken some programs (similar behaviour to x86 here). Hence we added commitf6795053da
. But we missed hugetlbfs which could still get such high mmap() addresses. So in theory that's a potential regression that should have bee addressed at the same time as commitf6795053da
(and before arm64 enabled 52-bit addresses)" Link: https://lkml.kernel.org/r/ab847b6edb197bffdfe189e70fb4ac76bfe79e0d.1650033747.git.christophe.leroy@csgroup.eu Fixes:f6795053da
("mm: mmap: Allow for "high" userspace addresses") Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Steve Capper <steve.capper@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: <stable@vger.kernel.org> [5.0.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
50cbc583fa
commit
6b932920b9
3 changed files with 13 additions and 12 deletions
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@ -206,7 +206,7 @@ hugetlb_get_unmapped_area_bottomup(struct file *file, unsigned long addr,
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info.flags = 0;
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info.length = len;
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info.low_limit = current->mm->mmap_base;
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info.high_limit = TASK_SIZE;
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info.high_limit = arch_get_mmap_end(addr);
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info.align_mask = PAGE_MASK & ~huge_page_mask(h);
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info.align_offset = 0;
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return vm_unmapped_area(&info);
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@ -222,7 +222,7 @@ hugetlb_get_unmapped_area_topdown(struct file *file, unsigned long addr,
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info.flags = VM_UNMAPPED_AREA_TOPDOWN;
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info.length = len;
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info.low_limit = max(PAGE_SIZE, mmap_min_addr);
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info.high_limit = current->mm->mmap_base;
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info.high_limit = arch_get_mmap_base(addr, current->mm->mmap_base);
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info.align_mask = PAGE_MASK & ~huge_page_mask(h);
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info.align_offset = 0;
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addr = vm_unmapped_area(&info);
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@ -237,7 +237,7 @@ hugetlb_get_unmapped_area_topdown(struct file *file, unsigned long addr,
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VM_BUG_ON(addr != -ENOMEM);
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info.flags = 0;
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info.low_limit = current->mm->mmap_base;
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info.high_limit = TASK_SIZE;
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info.high_limit = arch_get_mmap_end(addr);
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addr = vm_unmapped_area(&info);
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}
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@ -251,6 +251,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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struct hstate *h = hstate_file(file);
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const unsigned long mmap_end = arch_get_mmap_end(addr);
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if (len & ~huge_page_mask(h))
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return -EINVAL;
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@ -266,7 +267,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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if (addr) {
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addr = ALIGN(addr, huge_page_size(h));
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vma = find_vma(mm, addr);
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if (TASK_SIZE - len >= addr &&
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if (mmap_end - len >= addr &&
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(!vma || addr + len <= vm_start_gap(vma)))
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return addr;
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}
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@ -106,6 +106,14 @@ static inline void mm_update_next_owner(struct mm_struct *mm)
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#endif /* CONFIG_MEMCG */
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#ifdef CONFIG_MMU
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#ifndef arch_get_mmap_end
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#define arch_get_mmap_end(addr) (TASK_SIZE)
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#endif
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#ifndef arch_get_mmap_base
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#define arch_get_mmap_base(addr, base) (base)
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#endif
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extern void arch_pick_mmap_layout(struct mm_struct *mm,
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struct rlimit *rlim_stack);
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extern unsigned long
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@ -2140,14 +2140,6 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info)
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return addr;
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}
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#ifndef arch_get_mmap_end
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#define arch_get_mmap_end(addr) (TASK_SIZE)
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#endif
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#ifndef arch_get_mmap_base
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#define arch_get_mmap_base(addr, base) (base)
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#endif
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/* Get an address range which is currently unmapped.
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* For shmat() with addr=0.
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*
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