From: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Subject: mm, hugetlb: allow for "high" userspace addresses
This is a fix for commit f6795053dac8 ("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 commit f6795053dac8 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 commit f6795053dac8. 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 commit f6795053dac8 (and before arm64 enabled
: 52-bit addresses).
Link: https://lkml.kernel.org/r/ab847b6edb197bffdfe189e70fb4ac76bfe79e0d.1650033747.git.christophe.leroy@xxxxxxxxxx
Fixes: f6795053dac8 ("mm: mmap: Allow for "high" userspace addresses")
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Steve Capper <steve.capper@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [5.0.x]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/hugetlbfs/inode.c | 9 +++++----
include/linux/sched/mm.h | 8 ++++++++
mm/mmap.c | 8 --------
3 files changed, 13 insertions(+), 12 deletions(-)
--- a/fs/hugetlbfs/inode.c~mm-hugetlbfs-allow-for-high-userspace-addresses
+++ a/fs/hugetlbfs/inode.c
@@ -206,7 +206,7 @@ hugetlb_get_unmapped_area_bottomup(struc
info.flags = 0;
info.length = len;
info.low_limit = current->mm->mmap_base;
- info.high_limit = TASK_SIZE;
+ info.high_limit = arch_get_mmap_end(addr);
info.align_mask = PAGE_MASK & ~huge_page_mask(h);
info.align_offset = 0;
return vm_unmapped_area(&info);
@@ -222,7 +222,7 @@ hugetlb_get_unmapped_area_topdown(struct
info.flags = VM_UNMAPPED_AREA_TOPDOWN;
info.length = len;
info.low_limit = max(PAGE_SIZE, mmap_min_addr);
- info.high_limit = current->mm->mmap_base;
+ info.high_limit = arch_get_mmap_base(addr, current->mm->mmap_base);
info.align_mask = PAGE_MASK & ~huge_page_mask(h);
info.align_offset = 0;
addr = vm_unmapped_area(&info);
@@ -237,7 +237,7 @@ hugetlb_get_unmapped_area_topdown(struct
VM_BUG_ON(addr != -ENOMEM);
info.flags = 0;
info.low_limit = current->mm->mmap_base;
- info.high_limit = TASK_SIZE;
+ info.high_limit = arch_get_mmap_end(addr);
addr = vm_unmapped_area(&info);
}
@@ -251,6 +251,7 @@ hugetlb_get_unmapped_area(struct file *f
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
struct hstate *h = hstate_file(file);
+ const unsigned long mmap_end = arch_get_mmap_end(addr);
if (len & ~huge_page_mask(h))
return -EINVAL;
@@ -266,7 +267,7 @@ hugetlb_get_unmapped_area(struct file *f
if (addr) {
addr = ALIGN(addr, huge_page_size(h));
vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
+ if (mmap_end - len >= addr &&
(!vma || addr + len <= vm_start_gap(vma)))
return addr;
}
--- a/include/linux/sched/mm.h~mm-hugetlbfs-allow-for-high-userspace-addresses
+++ a/include/linux/sched/mm.h
@@ -136,6 +136,14 @@ static inline void mm_update_next_owner(
#endif /* CONFIG_MEMCG */
#ifdef CONFIG_MMU
+#ifndef arch_get_mmap_end
+#define arch_get_mmap_end(addr) (TASK_SIZE)
+#endif
+
+#ifndef arch_get_mmap_base
+#define arch_get_mmap_base(addr, base) (base)
+#endif
+
extern void arch_pick_mmap_layout(struct mm_struct *mm,
struct rlimit *rlim_stack);
extern unsigned long
--- a/mm/mmap.c~mm-hugetlbfs-allow-for-high-userspace-addresses
+++ a/mm/mmap.c
@@ -2117,14 +2117,6 @@ unsigned long vm_unmapped_area(struct vm
return addr;
}
-#ifndef arch_get_mmap_end
-#define arch_get_mmap_end(addr) (TASK_SIZE)
-#endif
-
-#ifndef arch_get_mmap_base
-#define arch_get_mmap_base(addr, base) (base)
-#endif
-
/* Get an address range which is currently unmapped.
* For shmat() with addr=0.
*
_
