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prctl: Disable prctl(PR_SET_MDWE) on parisc

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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 <[email protected]>
Co-developed-by: Linus Torvalds <[email protected]>
Reported-by: Sam James <[email protected]>
Closes: https://github.com/systemd/systemd/issues/29775
Tested-by: Sam James <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
Cc: <[email protected]> # v6.3+
This commit is contained in:
Helge Deller committed 2023-11-18 19:35:31 +01:00
1 parent 6ad6e15a9c
commit 793838138c
1 file changed
+4
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kernel/sys.c
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@@ -2394,6 +2394,10 @@ static inline int prctl_set_mdwe(unsigned long bits, unsigned long arg3,
if (bits & PR_MDWE_NO_INHERIT && !(bits & PR_MDWE_REFUSE_EXEC_GAIN))
return -EINVAL;
/* PARISC cannot allow mdwe as it needs writable stacks */
if (IS_ENABLED(CONFIG_PARISC))
return -EINVAL;
current_bits = get_current_mdwe();
if (current_bits && current_bits != bits)
return -EPERM; /* Cannot unset the flags */