[GIT PULL] x86/urgent for v5.19-rc6

From: Borislav Petkov
Date: Sun Jul 10 2022 - 06:19:13 EST

Hi Linus,

please pull a couple of urgent x86 fixes for 5.19.



The following changes since commit 03c765b0e3b4cb5063276b086c76f7a612856a9a:

Linux 5.19-rc4 (2022-06-26 14:22:10 -0700)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tags/x86_urgent_for_v5.19_rc6

for you to fetch changes up to cb8a4beac39b90cd60abbf9fd639a3357274e469:

x86/boot: Fix the setup data types max limit (2022-07-10 11:17:40 +0200)

- Prepare for and clear .brk early in order to address XenPV guests
failures where the hypervisor verifies page tables and uninitialized
data in that range leads to bogus failures in those checks

- Add any potential setup_data entries supplied at boot to the identity
pagetable mappings to prevent kexec kernel boot failures. Usually, this
is not a problem for the normal kernel as those mappings are part of
the initially mapped 2M pages but if kexec gets to allocate the second
kernel somewhere else, those setup_data entries need to be mapped there

- Fix objtool not to discard text references from the __tracepoints
section so that ENDBR validation still works

- Correct the setup_data types limit as it is user-visible, before 5.19

Borislav Petkov (1):
x86/boot: Fix the setup data types max limit

Juergen Gross (3):
x86/xen: Use clear_bss() for Xen PV guests
x86: Clear .brk area at early boot
x86: Fix .brk attribute in linker script

Michael Roth (1):
x86/compressed/64: Add identity mappings for setup_data entries

Peter Zijlstra (1):
x86/ibt, objtool: Don't discard text references from tracepoint section

arch/x86/boot/compressed/ident_map_64.c | 13 +++++++++++++
arch/x86/include/asm/setup.h | 3 +++
arch/x86/include/uapi/asm/bootparam.h | 2 +-
arch/x86/kernel/head64.c | 4 +++-
arch/x86/kernel/vmlinux.lds.S | 2 +-
arch/x86/xen/enlighten_pv.c | 8 ++++++--
arch/x86/xen/xen-head.S | 10 +---------
tools/objtool/check.c | 3 +--
8 files changed, 29 insertions(+), 16 deletions(-)


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