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Fix missing UFFDIO_WRITEPROTECT ioctl for write protecting #1

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Fix missing UFFDIO_WRITEPROTECT ioctl for write protecting #1

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12 changes: 12 additions & 0 deletions src/copy_interpose.c
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Original file line number Diff line number Diff line change
Expand Up @@ -353,6 +353,18 @@ void *memcpy(void *dest, const void *src, size_t n) {
perror("register with WP");
abort();
}
struct uffdio_writeprotect wp;
wp.range.start = (uint64_t)(src_entry->addr + src_entry->offset);
wp.range.len = (uint64_t)src_entry->len;
wp.mode = UFFDIO_WRITEPROTECT_MODE_WP;
if (ioctl(uffd, UFFDIO_WRITEPROTECT, &wp) == -1) {
if (errno == EINVAL) {
LOG("[%s] write-protection fault by userfaultfd may not be"
"supported by the current kernel\n");
}
perror("Writeprotect pages");
abort();
}
}

size_t left_fringe_len = LEFT_FRINGE_LEN(dest);
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