Update Linux to v5.4.148
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.148.tar.gz
Change-Id: Ib3d26c5ba9b022e2e03533005c4fed4d7c30b61b
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/mm/mmap.c b/mm/mmap.c
index a7d8c84..ba78f1f 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -90,12 +90,6 @@
* MAP_PRIVATE r: (no) no r: (yes) yes r: (no) yes r: (no) yes
* w: (no) no w: (no) no w: (copy) copy w: (no) no
* x: (no) no x: (no) yes x: (no) yes x: (yes) yes
- *
- * On arm64, PROT_EXEC has the following behaviour for both MAP_SHARED and
- * MAP_PRIVATE:
- * r: (no) no
- * w: (no) no
- * x: (yes) yes
*/
pgprot_t protection_map[16] __ro_after_init = {
__P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
@@ -201,8 +195,6 @@
bool downgraded = false;
LIST_HEAD(uf);
- brk = untagged_addr(brk);
-
if (down_write_killable(&mm->mmap_sem))
return -EINTR;
@@ -1589,8 +1581,6 @@
struct file *file = NULL;
unsigned long retval;
- addr = untagged_addr(addr);
-
if (!(flags & MAP_ANONYMOUS)) {
audit_mmap_fd(fd, flags);
file = fget(fd);
@@ -2136,6 +2126,7 @@
info.low_limit = mm->mmap_base;
info.high_limit = mmap_end;
info.align_mask = 0;
+ info.align_offset = 0;
return vm_unmapped_area(&info);
}
#endif
@@ -2177,6 +2168,7 @@
info.low_limit = max(PAGE_SIZE, mmap_min_addr);
info.high_limit = arch_get_mmap_base(addr, mm->mmap_base);
info.align_mask = 0;
+ info.align_offset = 0;
addr = vm_unmapped_area(&info);
/*
@@ -2632,7 +2624,7 @@
* Create a list of vma's touched by the unmap, removing them from the mm's
* vma list as we go..
*/
-static void
+static bool
detach_vmas_to_be_unmapped(struct mm_struct *mm, struct vm_area_struct *vma,
struct vm_area_struct *prev, unsigned long end)
{
@@ -2657,6 +2649,17 @@
/* Kill the cache */
vmacache_invalidate(mm);
+
+ /*
+ * Do not downgrade mmap_lock if we are next to VM_GROWSDOWN or
+ * VM_GROWSUP VMA. Such VMAs can change their size under
+ * down_read(mmap_lock) and collide with the VMA we are about to unmap.
+ */
+ if (vma && (vma->vm_flags & VM_GROWSDOWN))
+ return false;
+ if (prev && (prev->vm_flags & VM_GROWSUP))
+ return false;
+ return true;
}
/*
@@ -2837,7 +2840,8 @@
}
/* Detach vmas from rbtree */
- detach_vmas_to_be_unmapped(mm, vma, prev, end);
+ if (!detach_vmas_to_be_unmapped(mm, vma, prev, end))
+ downgrade = false;
if (downgrade)
downgrade_write(&mm->mmap_sem);
@@ -3170,6 +3174,7 @@
if (vma->vm_flags & VM_ACCOUNT)
nr_accounted += vma_pages(vma);
vma = remove_vma(vma);
+ cond_resched();
}
vm_unacct_memory(nr_accounted);
}