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linux/arch/x86
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Stanislav Fomichev 7973a0dad0 bpf: Use NOP_ATOMIC5 instead of emit_nops(&prog, 5) for BPF_TRAMP_F_CALL_ORIG 
commit b908297047 upstream.

__bpf_arch_text_poke does rewrite only for atomic nop5, emit_nops(xxx, 5)
emits non-atomic one which breaks fentry/fexit with k8 atomics:

P6_NOP5 == P6_NOP5_ATOMIC (0f1f440000 == 0f1f440000)
K8_NOP5 != K8_NOP5_ATOMIC (6666906690 != 6666666690)

Can be reproduced by doing "ideal_nops = k8_nops" in "arch_init_ideal_nops()
and running fexit_bpf2bpf selftest.

Fixes: e21aa34178 ("bpf: Fix fexit trampoline.")
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210320000001.915366-1-sdf@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2021-04-07 15:00:14 +02:00
..
boot A set of fixes for x86: 2020-12-06 11:22:39 -08:00
configs * A defconfig fix, from Daniel Díaz. 2020-09-20 15:06:43 -07:00
crypto crypto: x86/aes-ni-xts - use direct calls to and 4-way stride 2021-03-20 10:43:43 +01:00
entry x86/entry: Fix entry/exit mismatch on failed fast 32-bit syscalls 2021-03-17 17:06:36 +01:00
events perf/x86/intel: Fix unchecked MSR access error caused by VLBR_EVENT 2021-03-25 09:04:16 +01:00
hyperv x86/hyperv: Fix kexec panic/hang issues 2021-01-27 11:54:57 +01:00
ia32 x86: remove address space overrides using set_fs() 2020-09-08 22:21:36 -04:00
include ACPI: processor: Fix CPU0 wakeup in acpi_idle_play_dead() 2021-04-07 15:00:08 +02:00
kernel ACPI: processor: Fix CPU0 wakeup in acpi_idle_play_dead() 2021-04-07 15:00:08 +02:00
kvm KVM: SVM: ensure that EFER.SVME is set when running nested guest or on nested vmexit 2021-04-07 15:00:09 +02:00
lib x86/sev-es: Use __copy_from_user_inatomic() 2021-03-17 17:06:36 +01:00
math-emu treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mm x86/mem_encrypt: Correct physical address calculation in __set_clr_pte_enc() 2021-03-30 14:32:07 +02:00
net bpf: Use NOP_ATOMIC5 instead of emit_nops(&prog, 5) for BPF_TRAMP_F_CALL_ORIG 2021-04-07 15:00:14 +02:00
oprofile x86: Use pr_warn instead of pr_warning 2019-10-18 15:00:18 +02:00
pci x86/pci: Create PCI/MSI irqdomain after x86_init.pci.arch_init() 2021-02-17 11:02:28 +01:00
platform x86/efi: Remove EFI PGD build time checks 2021-02-17 11:02:24 +01:00
power Kbuild updates for v5.9 2020-08-09 14:10:26 -07:00
purgatory treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
ras treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
realmode x86/head/64: Don't call verify_cpu() on starting APs 2020-09-09 11:33:20 +02:00
tools x86/build: Treat R_386_PLT32 relocation as R_386_PC32 2021-03-07 12:34:04 +01:00
um arch/um: partially revert the conversion to __section() macro 2020-10-26 15:39:37 -07:00
video treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
xen Revert "xen: fix p2m size in dom0 for disabled memory hotplug case" 2021-03-30 14:32:08 +02:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Kbuild treewide: Add SPDX license identifier - Kbuild 2019-05-30 11:32:33 -07:00
Kconfig fanotify: Fix sys_fanotify_mark() on native x86-32 2021-01-17 14:16:59 +01:00
Kconfig.assembler x86/delay: Introduce TPAUSE delay 2020-05-07 16:06:20 +02:00
Kconfig.cpu treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Kconfig.debug x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}() 2020-10-06 11:18:04 +02:00
Makefile x86/build: Disable CET instrumentation in the kernel for 32-bit too 2021-02-17 11:02:27 +01:00
Makefile.um x86, powerpc: Remove -funit-at-a-time compiler option entirely 2018-12-09 11:55:32 +01:00
Makefile_32.cpu x86/math-emu: Limit MATH_EMULATION to 486SX compatibles 2019-10-03 10:51:17 +02:00