This is a note to let you know that I've just added the patch titled x86/entry: Clear X86_FEATURE_SMAP when CONFIG_X86_SMAP=n to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-entry-clear-x86_feature_smap-when-config_x86_smap-n.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 3958b9c34c2729597e182cc606cc43942fd19f7c Mon Sep 17 00:00:00 2001 From: Vegard Nossum <vegard.nossum@xxxxxxxxxx> Date: Mon, 4 Oct 2021 00:34:23 +0200 Subject: x86/entry: Clear X86_FEATURE_SMAP when CONFIG_X86_SMAP=n From: Vegard Nossum <vegard.nossum@xxxxxxxxxx> commit 3958b9c34c2729597e182cc606cc43942fd19f7c upstream. Commit 3c73b81a9164 ("x86/entry, selftests: Further improve user entry sanity checks") added a warning if AC is set when in the kernel. Commit 662a0221893a3d ("x86/entry: Fix AC assertion") changed the warning to only fire if the CPU supports SMAP. However, the warning can still trigger on a machine that supports SMAP but where it's disabled in the kernel config and when running the syscall_nt selftest, for example: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 49 at irqentry_enter_from_user_mode CPU: 0 PID: 49 Comm: init Tainted: G T 5.15.0-rc4+ #98 e6202628ee053b4f310759978284bd8bb0ce6905 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 RIP: 0010:irqentry_enter_from_user_mode ... Call Trace: ? irqentry_enter ? exc_general_protection ? asm_exc_general_protection ? asm_exc_general_protectio IS_ENABLED(CONFIG_X86_SMAP) could be added to the warning condition, but even this would not be enough in case SMAP is disabled at boot time with the "nosmap" parameter. To be consistent with "nosmap" behaviour, clear X86_FEATURE_SMAP when !CONFIG_X86_SMAP. Found using entry-fuzz + satrandconfig. [ bp: Massage commit message. ] Fixes: 3c73b81a9164 ("x86/entry, selftests: Further improve user entry sanity checks") Fixes: 662a0221893a ("x86/entry: Fix AC assertion") Signed-off-by: Vegard Nossum <vegard.nossum@xxxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Link: https://lkml.kernel.org/r/20211003223423.8666-1-vegard.nossum@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/kernel/cpu/common.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -320,6 +320,7 @@ static __always_inline void setup_smap(s #ifdef CONFIG_X86_SMAP cr4_set_bits(X86_CR4_SMAP); #else + clear_cpu_cap(c, X86_FEATURE_SMAP); cr4_clear_bits(X86_CR4_SMAP); #endif } Patches currently in stable-queue which might be from vegard.nossum@xxxxxxxxxx are queue-5.10/x86-entry-clear-x86_feature_smap-when-config_x86_smap-n.patch