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From 339b41ec357c24c02ed4aed6267dbfd443ee1e8e Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Mon, 13 Nov 2023 16:06:18 +0100
Subject: prctl: Temporarily disable prctl(PR_SET_MDWE) on parisc
systemd-254 tries to use prctl(PR_SET_MDWE) for systemd's
MemoryDenyWriteExecute functionality, but fails on PA-RISC/HPPA which
still needs executable stacks.
Temporarily disable prctl(PR_SET_MDWE) by returning -ENODEV on parisc
for now. Note that we can't return -EINVAL since systemd will then try
to use seccomp instead.
Reported-by: Sam James <sam@gentoo.org>
Signed-off-by: Helge Deller <deller@gmx.de>
Link: https://lore.kernel.org/all/875y2jro9a.fsf@gentoo.org/
Link: https://github.com/systemd/systemd/issues/29775.
Cc: <stable@vger.kernel.org> # v6.3+
---
kernel/sys.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/kernel/sys.c b/kernel/sys.c
index 420d9cb9cc8e2..8e3eaf650d07d 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2700,10 +2700,16 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
break;
#endif
case PR_SET_MDWE:
- error = prctl_set_mdwe(arg2, arg3, arg4, arg5);
+ if (IS_ENABLED(CONFIG_PARISC))
+ error = -EINVAL;
+ else
+ error = prctl_set_mdwe(arg2, arg3, arg4, arg5);
break;
case PR_GET_MDWE:
- error = prctl_get_mdwe(arg2, arg3, arg4, arg5);
+ if (IS_ENABLED(CONFIG_PARISC))
+ error = -EINVAL;
+ else
+ error = prctl_get_mdwe(arg2, arg3, arg4, arg5);
break;
case PR_SET_VMA:
error = prctl_set_vma(arg2, arg3, arg4, arg5);
--
cgit
Filename: fallback-exec-stack.patch. Size: 2kb. View raw, copy, hex, or download this file.
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