Fix madvise(MADV_DONTDUMP)
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@ -1248,7 +1248,20 @@ abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice)
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switch (advice) {
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case MADV_DONTDUMP:
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if (len > 0) {
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page_set_flags(start, start + len - 1, PAGE_DONTDUMP);
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/*
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* To set the page permissons, we must OR our new flags with the
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* existing flags. Only mark the pages as PAGE_DONTDUMP if the
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* entire range has the same flags. If any part of the range
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* differs, we would need to process it one page at a time which
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* might not be very performant. Since we are not obliged to respect
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* this flag, we will support it for the most likely usage scenario.
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* Note that we don't set PAGE_ANON, since this can only be set with
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* new mappings.
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*/
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int flg = page_get_flags(start);
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if (page_check_range(start, len, flg)) {
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page_set_flags(start, start + len - 1, PAGE_DONTDUMP | (flg & ~PAGE_ANON) );
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}
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}
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break;
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case MADV_WIPEONFORK:
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