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5e271995d1
HIGHMEM kmap interfaces operate on only a single page at a time yet ZFS hadn't accounted for this, resulting in crashes and potential memory corruption on HIGHMEM (typically 32-bit) systems. This was caught by PaX's KERNSEAL feature as it makes use of HIGHMEM functionality on x64. On typical 64-bit systems, this issue wouldn't have been observed, as the map interfaces simply fall back to returning an address in lowmem where the contiguous pages can be accessed directly. Joint work with the PaX Team, tested by Mark van Dijk Reviewed-by: RageLtMan <rageltman@sempervictus> Reviewed-by: Rob Norris <robn@despairlabs.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: bspengler-oss <94915855+bspengler-oss@users.noreply.github.com> Closes #15668 Closes #18030 |
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