AuxXxilium/linux_dsm_epyc7002
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b51ce3744f
linux_dsm_epyc7002/arch/x86
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Gary Hook b51ce3744f x86/mm/mem_encrypt: Disable all instrumentation for early SME setup 
Enablement of AMD's Secure Memory Encryption feature is determined very
early after start_kernel() is entered. Part of this procedure involves
scanning the command line for the parameter 'mem_encrypt'.

To determine intended state, the function sme_enable() uses library
functions cmdline_find_option() and strncmp(). Their use occurs early
enough such that it cannot be assumed that any instrumentation subsystem
is initialized.

For example, making calls to a KASAN-instrumented function before KASAN
is set up will result in the use of uninitialized memory and a boot
failure.

When AMD's SME support is enabled, conditionally disable instrumentation
of these dependent functions in lib/string.c and arch/x86/lib/cmdline.c.

 [ bp: Get rid of intermediary nostackp var and cleanup whitespace. ]

Fixes: aca20d5462 ("x86/mm: Add support to make use of Secure Memory Encryption")
Reported-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: Coly Li <colyli@suse.de>
Cc: "dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Cc: "luto@kernel.org" <luto@kernel.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: "mingo@redhat.com" <mingo@redhat.com>
Cc: "peterz@infradead.org" <peterz@infradead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/155657657552.7116.18363762932464011367.stgit@sosrh3.amd.com
2019-04-30 17:59:08 +02:00
..
boot x86/boot: Disable RSDP parsing temporarily 2019-04-22 11:36:43 +02:00
configs Merge branch 'akpm' (patches from Andrew) 2019-03-07 19:25:37 -08:00
crypto
entry pidfd patches for v5.1-rc1 2019-03-16 13:47:14 -07:00
events perf/x86/intel: Make dev_attr_allow_tsx_force_abort static 2019-03-17 08:40:18 +01:00
hyperv x86/hyperv: Prevent potential NULL pointer dereference 2019-03-21 12:24:39 +01:00
ia32 a.out: remove core dumping support 2019-03-05 10:00:35 -08:00
include x86/asm: Use stricter assembly constraints in bitops 2019-04-06 09:52:02 +02:00
kernel x86/cpu/intel: Lower the "ENERGY_PERF_BIAS: Set to normal" message's log priority 2019-04-19 19:23:13 +02:00
kvm ARM: some cleanups, direct physical timer assignment, cache sanitization 2019-03-15 15:00:28 -07:00
lib x86/mm/mem_encrypt: Disable all instrumentation for early SME setup 2019-04-30 17:59:08 +02:00
math-emu
mm x86/mm: Fix a crash with kmemleak_scan() 2019-04-24 11:32:34 +02:00
net
oprofile
pci
platform x86/realmode: Make set_real_mode_mem() static inline 2019-03-29 10:16:27 +01:00
power
purgatory
ras
realmode x86/realmode: Make set_real_mode_mem() static inline 2019-03-29 10:16:27 +01:00
tools
um Merge branch 'timers-2038-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-03-05 14:08:26 -08:00
video
xen Merge branch 'akpm' (patches from Andrew) 2019-03-12 10:39:53 -07:00
.gitignore
Kbuild
Kconfig x86/Kconfig: Fix spelling mistake "effectivness" -> "effectiveness" 2019-04-16 13:27:34 +02:00
Kconfig.cpu
Kconfig.debug
Makefile x86/retpolines: Disable switch jump tables when retpolines are enabled 2019-03-28 13:39:48 +01:00
Makefile_32.cpu
Makefile.um