Description
There are a couple of small patches I had to apply to get the kernel to build under NixOS, the main problem in NixOS/nixpkgs#242244
patch 1:
diff --git a/Makefile b/Makefile
index 18482f5ab5948..c97a6a2031d6d 100644
--- a/Makefile
+++ b/Makefile
@@ -997,9 +997,6 @@ NOSTDINC_FLAGS += -nostdinc
# perform bounds checking.
KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
-# disable invalid "can't wrap" optimizations for signed / pointers
-KBUILD_CFLAGS += -fno-strict-overflow
-
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS += -fno-stack-checkThis is because NixOS clang-wrapper already includes -fwrapv which does the same thing.
patch 2:
diff --git a/Makefile b/Makefile
index c97a6a2031d6d..26d80dc099eca 100644
--- a/Makefile
+++ b/Makefile
@@ -536,6 +536,9 @@ RUSTFLAGS_KERNEL =
AFLAGS_KERNEL =
LDFLAGS_vmlinux =
+LDFLAGS_MODULE += --no-dynamic-linker
+LDFLAGS_vmlinux += --no-dynamic-linker
+
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE := \
-I$(srctree)/arch/$(SRCARCH)/include/uapi \
diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index f33e45ed14376..4f7f23ae75cea 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -102,7 +102,7 @@ $(obj)/zoffset.h: $(obj)/compressed/vmlinux FORCE
AFLAGS_header.o += -I$(objtree)/$(obj)
$(obj)/header.o: $(obj)/zoffset.h
-LDFLAGS_setup.elf := -m elf_i386 -z noexecstack -T
+LDFLAGS_setup.elf := --no-dynamic-linker -m elf_i386 -z noexecstack -T
$(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE
$(call if_changed,ld)This is to deal with issue 242244
with these patches the kernel builds successfully, but when trying to boot it in qemu, I got:
(this is with -cpu max and no kvm)
[ 0.025048][ T1] BUG: unable to handle page fault for address: ffff9e9b28736a3b
[ 0.025578][ T1] #PF: supervisor write access in kernel mode
[ 0.025698][ T1] #PF: error_code(0x0002) - not-present page
[ 0.025698][ T1] PGD 39e01067 P4D 39e01067 PUD 0
[ 0.025698][ T1] Oops: 0002 [#1] PREEMPT SMP NOPTI
[ 0.025698][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.12-lqx1 #1-NixOS
[ 0.025698][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 0.025698][ T1] RIP: 0010:setup_real_mode+0x10c/0x1c0
[ 0.025698][ T1] Code: 8b 58 0c 48 03 1d 34 c0 55 ff 0f 32 49 89 d6 49 c1 e6 20 49 09 c6 0f 1f 44 00 00 49 81 e6 ff fb ff ff 48 8d 43 10 48 8d 4b 18 <4c> 89 73 08 48 c7 03 60 00 e0 83 48 89 05 52 c0 18 00 8b 05 34 c0
[ 0.025698][ T1] RSP: 0018:ffffaa4180013b88 EFLAGS: 00010202
[ 0.025698][ T1] RAX: ffff9e9b28736a43 RBX: ffff9e9b28736a33 RCX: ffff9e9b28736a4b
[ 0.025698][ T1] RDX: 0000000000000000 RSI: 0000000000000022 RDI: 0000000000002267
[ 0.025698][ T1] RBP: ffffaa4180013ed0 R08: 0000000000000e17 R09: ffff9e9afdc32860
[ 0.025698][ T1] R10: ffff9e9afeeddcc0 R11: ffffffff85791010 R12: ffffffff852105d8
[ 0.025698][ T1] R13: 0000000000000000 R14: 0000000000200901 R15: 0000000000000000
[ 0.025698][ T1] FS: 0000000000000000(0000) GS:ffff9e9afdc00000(0000) knlGS:0000000000000000
[ 0.025698][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.025698][ T1] CR2: ffff9e9b28736a3b CR3: 0000000039418000 CR4: 0000000000750ef0
[ 0.025698][ T1] PKRU: 55555554
[ 0.025698][ T1] Call Trace:
[ 0.025698][ T1] <TASK>
[ 0.025698][ T1] ? __die_body+0x68/0xb0
[ 0.025698][ T1] ? page_fault_oops+0x353/0x3d0
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? do_kern_addr_fault+0x9b/0xd0
[ 0.025698][ T1] ? exc_page_fault+0x82/0x150
[ 0.025698][ T1] ? asm_exc_page_fault+0x26/0x30
[ 0.025698][ T1] ? reserve_real_mode+0xa0/0xa0
[ 0.025698][ T1] ? setup_real_mode+0x10c/0x1c0
[ 0.025698][ T1] ? setup_real_mode+0x6c/0x1c0
[ 0.025698][ T1] ? set_real_mode_permissions+0xa0/0xa0
[ 0.025698][ T1] init_real_mode+0x18/0x30
[ 0.025698][ T1] do_init_real_mode+0x13/0x20
[ 0.025698][ T1] do_one_initcall+0x120/0x340
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? printk_get_next_message+0xfd/0x3c0
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? __switch_to+0x151/0x5b0
[ 0.025698][ T1] ? hrtimer_start_range_ns+0x26d/0x2f0
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? finish_task_switch+0xb9/0x300
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? __schedule+0x757/0xcc0
[ 0.025698][ T1] ? __kthread_create_on_node+0xb5/0x190
[ 0.025698][ T1] ? __kmem_cache_alloc_node+0x13e/0x1f0
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? schedule+0x6b/0xc0
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? schedule_timeout+0x32/0x180
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? wait_for_common+0x185/0x1c0
[ 0.025698][ T1] ? tasks_rcu_exit_srcu_stall+0x90/0x90
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? enqueue_task+0x7a/0x240
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? activate_task+0x13/0x140
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? ttwu_do_activate+0x49/0xf0
[ 0.025698][ T1] ? srso_alias_return_thunk+0x5/0x7f
[ 0.025698][ T1] ? try_to_wake_up+0x308/0x4a0
[ 0.025698][ T1] do_pre_smp_initcalls+0x31/0xa0
[ 0.025698][ T1] kernel_init_freeable+0xd3/0x160
[ 0.025698][ T1] ? rest_init+0xd0/0xd0
[ 0.025698][ T1] kernel_init+0x1a/0x1a0
[ 0.025698][ T1] ret_from_fork+0x37/0x50
[ 0.025698][ T1] ? rest_init+0xd0/0xd0
[ 0.025698][ T1] ret_from_fork_asm+0x11/0x20
[ 0.025698][ T1] </TASK>
[ 0.025698][ T1] Modules linked in:
[ 0.025698][ T1] CR2: ffff9e9b28736a3b
[ 0.025698][ T1] ---[ end trace 0000000000000000 ]---
[ 0.025698][ T1] RIP: 0010:setup_real_mode+0x10c/0x1c0
[ 0.025698][ T1] Code: 8b 58 0c 48 03 1d 34 c0 55 ff 0f 32 49 89 d6 49 c1 e6 20 49 09 c6 0f 1f 44 00 00 49 81 e6 ff fb ff ff 48 8d 43 10 48 8d 4b 18 <4c> 89 73 08 48 c7 03 60 00 e0 83 48 89 05 52 c0 18 00 8b 05 34 c0
[ 0.025698][ T1] RSP: 0018:ffffaa4180013b88 EFLAGS: 00010202
[ 0.025698][ T1] RAX: ffff9e9b28736a43 RBX: ffff9e9b28736a33 RCX: ffff9e9b28736a4b
[ 0.025698][ T1] RDX: 0000000000000000 RSI: 0000000000000022 RDI: 0000000000002267
[ 0.025698][ T1] RBP: ffffaa4180013ed0 R08: 0000000000000e17 R09: ffff9e9afdc32860
[ 0.025698][ T1] R10: ffff9e9afeeddcc0 R11: ffffffff85791010 R12: ffffffff852105d8
[ 0.025698][ T1] R13: 0000000000000000 R14: 0000000000200901 R15: 0000000000000000
[ 0.025698][ T1] FS: 0000000000000000(0000) GS:ffff9e9afdc00000(0000) knlGS:0000000000000000
[ 0.025698][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.025698][ T1] CR2: ffff9e9b28736a3b CR3: 0000000039418000 CR4: 0000000000750ef0
[ 0.025698][ T1] PKRU: 55555554
[ 0.025698][ T1] note: swapper/0[1] exited with irqs disabled
[ 0.025701][ T1] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
[ 0.026337][ T1] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 ]---