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prctl: Disable prctl(PR_SET_MDWE) on parisc
systemd-254 tries to use prctl(PR_SET_MDWE) for it's MemoryDenyWriteExecute functionality, but fails on parisc which still needs executable stacks in certain combinations of gcc/glibc/kernel. Disable prctl(PR_SET_MDWE) by returning -EINVAL for now on parisc, until userspace has catched up. Signed-off-by: Helge Deller <deller@gmx.de> Co-developed-by: Linus Torvalds <torvalds@linux-foundation.org> Reported-by: Sam James <sam@gentoo.org> Closes: https://github.com/systemd/systemd/issues/29775 Tested-by: Sam James <sam@gentoo.org> Link: https://lore.kernel.org/all/875y2jro9a.fsf@gentoo.org/ Cc: <stable@vger.kernel.org> # v6.3+
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@ -2394,6 +2394,10 @@ static inline int prctl_set_mdwe(unsigned long bits, unsigned long arg3,
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if (bits & PR_MDWE_NO_INHERIT && !(bits & PR_MDWE_REFUSE_EXEC_GAIN))
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return -EINVAL;
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/* PARISC cannot allow mdwe as it needs writable stacks */
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if (IS_ENABLED(CONFIG_PARISC))
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return -EINVAL;
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current_bits = get_current_mdwe();
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if (current_bits && current_bits != bits)
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return -EPERM; /* Cannot unset the flags */
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