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ANDROID: 16K: procfs: maps: Don't show fixup VMAs

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Hide fixup VMAs from userspace which may parse maps to deduce inputs to
other syscalls (such as madvise).

The implicit __PAGE_ALIGN rounding on the length of the preceding
adjacent VMA already covers any operations needed on the fixup VMAs

Bug: 383389337
Bug: 315325080
Bug: 302403436
Change-Id: I2beef95474ced70d784213084c9b6e3d18f3ded2
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
This commit is contained in:
Kalesh Singh
2023-11-17 14:47:28 -08:00
committed by Carlos Llamas
parent e076e9ff2c
commit 7dea17008f
1 changed files with 6 additions and 0 deletions
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fs/proc/task_mmu.c
+6
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@@ -17,6 +17,7 @@
#include <linux/swapops.h> #include <linux/swapops.h>
#include <linux/mmu_notifier.h> #include <linux/mmu_notifier.h>
#include <linux/page_idle.h> #include <linux/page_idle.h>
#include <linux/page_size_compat.h>
#include <linux/shmem_fs.h> #include <linux/shmem_fs.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include <linux/pkeys.h> #include <linux/pkeys.h>
@@ -343,6 +344,11 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
start = vma->vm_start; start = vma->vm_start;
end = vma->vm_end; end = vma->vm_end;
/* Skip page size fixup VMAs */
if (flags & __VM_NO_COMPAT)
return;
show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino); show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino);
get_vma_name(vma, &path, &name, &name_fmt); get_vma_name(vma, &path, &name, &name_fmt);