Commit e4f74400308c ("s390/archrandom: simplify back to earlier design
and initialize earlier") has been backported to stable releases including
4.14 and 4.19.
Backport for 4.19
Link: https://lore.kernel.org/all/20220704102416.326257-1-Jason@xxxxxxxxx/
Backport for 4.14
Link: https://lore.kernel.org/all/20220704102819.337213-1-Jason@xxxxxxxxx/
Unfortunately on stable 4.14 and stable 4.19 it missed dependencies which
results in kernel warning and panic:
[ 0.202386] static_key_enable_cpuslocked(): static key 's390_arch_random_available+0x0/0x10' used before call to jump_label_init()
[ 0.202400] WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:131 static_key_enable_cpuslocked+0x56/0xc8
[ 0.202432] Modules linked in:
[ 0.202451] CPU: 0 PID: 0 Comm: swapper Not tainted 4.19.275-25331-g5504146b2053 #2
[ 0.202467] Hardware name: IBM 3931 A01 701 (KVM/Linux)
[ 0.202485] Krnl PSW : (____ptrval____) (____ptrval____) (static_key_enable_cpuslocked+0x56/0xc8)
[ 0.202504] R:0 T:1 IO:0 EX:0 Key:0 M:0 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
[ 0.202526] Krnl GPRS: 00000000fffd3474 000000000133074c 0000000000000076 0000000000eaaab2
[ 0.202544] 0000000000000000 000000008e64b4cd ffffffffffffffff 0000000000000000
[ 0.202561] 0000003d13b13b13 0000000000f2eb88 0000000001113018 0000000002008488
[ 0.202579] 0000000001372380 0000000000bea608 00000000002e36ea 0000000000f0fe20
[ 0.202600] Krnl Code: 00000000002e36de: c0200059cf3b larl %r2,0000000000e1d554
[ 0.202600] 00000000002e36e4: c0e50045cf06 brasl %r14,0000000000b9d4f0
[ 0.202600] #00000000002e36ea: a7f40001 brc 15,00000000002e36ec
[ 0.202600] >00000000002e36ee: c0e5fff33089 brasl %r14,0000000000149800
[ 0.202600] 00000000002e36f4: 5810c000 l %r1,0(%r12)
[ 0.202600] 00000000002e36f8: ec1c000c007e cij %r1,0,12,00000000002e3710
[ 0.202600] 00000000002e36fe: 5810c000 l %r1,0(%r12)
[ 0.202600] 00000000002e3702: ec180029017e cij %r1,1,8,00000000002e3754
[ 0.202636] Call Trace:
[ 0.202654] ([<00000000002e36ea>] static_key_enable_cpuslocked+0x52/0xc8)
[ 0.202672] [<00000000002e3858>] static_key_enable+0x38/0x48
[ 0.202691] [<00000000010b0a52>] setup_arch+0xb72/0xb80
[ 0.202709] [<00000000010aa966>] start_kernel+0x7e/0x540
[ 0.202728] [<000000000010008a>] startup_continue+0x8a/0x300
[ 0.207861] Jump label code mismatch at random_init+0x60/0x1a8 [00000000010f72f8]
[ 0.207882] Found: c0 f4 00 00 00 21
[ 0.207899] Expected: c0 04 00 00 00 01
[ 0.207916] New: c0 04 00 00 00 00
[ 0.207935] Kernel panic - not syncing: Corrupted kernel text
[ 0.207950] CPU: 0 PID: 0 Comm: swapper Tainted: G W 4.19.275-25331-g5504146b2053 #2
[ 0.207967] Hardware name: IBM 3931 A01 701 (KVM/Linux)
[ 0.207984] Call Trace:
[ 0.208002] ([<0000000000113f6a>] show_stack+0x8a/0xd8)
[ 0.208021] [<0000000000badcba>] dump_stack+0xaa/0xe8
[ 0.208038] [<0000000000b9d68c>] panic+0x12c/0x270
[ 0.208055] [<0000000000b9d1c0>] dump_fault_info.isra.0+0x0/0x330
[ 0.208073] [<000000000011ec10>] __jump_label_transform+0x98/0xc8
[ 0.208090] [<00000000010c5810>] jump_label_init+0xd8/0x138
[ 0.208112] [<00000000010aaace>] start_kernel+0x1e6/0x540
[ 0.208130] [<000000000010008a>] startup_continue+0x8a/0x300
The following 2 patches are needed to solve the issue.
Vasily Gorbik (2):
s390/maccess: add no DAT mode to kernel_write
s390/setup: init jump labels before command line parsing
arch/s390/kernel/setup.c | 1 +
arch/s390/mm/maccess.c | 16 +++++++++++-----
2 files changed, 12 insertions(+), 5 deletions(-)
--
2.38.1
