Commit 1d87b0d3 authored by Linus Torvalds's avatar Linus Torvalds
Browse files
parents d4cf109f 92dc07b1
......@@ -1208,9 +1208,11 @@ static unsigned long vma_dump_size(struct vm_area_struct *vma,
* check for an ELF header. If we find one, dump the first page to
* aid in determining what was mapped here.
*/
if (FILTER(ELF_HEADERS) && vma->vm_file != NULL && vma->vm_pgoff == 0) {
if (FILTER(ELF_HEADERS) &&
vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
u32 __user *header = (u32 __user *) vma->vm_start;
u32 word;
mm_segment_t fs = get_fs();
/*
* Doing it this way gets the constant folded by GCC.
*/
......@@ -1223,7 +1225,15 @@ static unsigned long vma_dump_size(struct vm_area_struct *vma,
magic.elfmag[EI_MAG1] = ELFMAG1;
magic.elfmag[EI_MAG2] = ELFMAG2;
magic.elfmag[EI_MAG3] = ELFMAG3;
if (get_user(word, header) == 0 && word == magic.cmp)
/*
* Switch to the user "segment" for get_user(),
* then put back what elf_core_dump() had in place.
*/
set_fs(USER_DS);
if (unlikely(get_user(word, header)))
word = 0;
set_fs(fs);
if (word == magic.cmp)
return PAGE_SIZE;
}
......
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