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Tuan Phan fbd4e4684a BACKPORT: Split the old READ_IMPLIES_EXEC workaround from executable 
PT_GNU_STACK now that toolchains long support PT_GNU_STACK marking and
there's no need anymore to force modern programs into having all its
user mappings executable instead of only the stack and the PROT_EXEC
ones.

Disable that automatic READ_IMPLIES_EXEC forcing on x86-64 and
arm64.

Add tables documenting how READ_IMPLIES_EXEC is handled on x86-64, arm
and arm64.

This patch is needed to fix softlock up observed during stress test.

Backport from: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.8-rc1&id=ac7b34218a0021bafd1d4c11c54217b930f516b0

Cherry-pick from: d6f5dfc8aa

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Tuan Phan <tphan@amperecomputing.com>
 		2021-03-16 16:43:59 +08:00
..
alpha alpha: fix annotation of io{read,write}{16,32}be() 2021-03-16 16:34:34 +08:00
arc ARC: stack unwinding: don't assume non-current task is sleeping 2021-03-16 16:42:10 +08:00
arm BACKPORT: Split the old READ_IMPLIES_EXEC workaround from executable 2021-03-16 16:43:59 +08:00
arm64 BACKPORT: Split the old READ_IMPLIES_EXEC workaround from executable 2021-03-16 16:43:59 +08:00
c6x Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
csky csky: Fixup abiv2 syscall_trace break a4 & a5 2021-03-16 16:28:56 +08:00
h8300 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
hexagon hexagon: define ioremap_uc 2021-03-16 16:27:29 +08:00
ia64 ia64: fix build error with !COREDUMP 2021-03-16 16:40:09 +08:00
m68k m68k: q40: Fix info-leak in rtc_ioctl 2021-03-16 16:36:33 +08:00
microblaze Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mips MIPS: Don't round up kernel sections size for memblock_add() 2021-03-16 16:43:02 +08:00
nds32 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
nios2 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
openrisc openrisc: Fix issue with get_user for 64-bit values 2021-03-16 16:39:36 +08:00
parisc kbuild: fix broken builds because of GZIP,BZIP2,LZOP variables 2021-03-16 16:35:20 +08:00
powerpc powerpc: sysdev: add missing iounmap() on error in mpic_msgr_probe() 2021-03-16 16:43:55 +08:00
riscv arch: pgtable: define MAX_POSSIBLE_PHYSMEM_BITS where needed 2021-03-16 16:41:41 +08:00
s390 s390/kexec_file: fix diag308 subcode when loading crash kernel 2021-03-16 16:43:27 +08:00
sh sh: landisk: Add missing initialization of sh_io_port_base 2021-03-16 16:34:22 +08:00
sparc sparc: fix handling of page table constructor failure 2021-03-16 16:43:15 +08:00
um um: ubd: Submit all data segments atomically 2021-03-16 16:43:56 +08:00
unicore32 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
x86 BACKPORT: Split the old READ_IMPLIES_EXEC workaround from executable 2021-03-16 16:43:59 +08:00
xtensa xtensa: uaccess: Add missing __user to strncpy_from_user() prototype 2021-03-16 16:41:40 +08:00
.gitignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Revert: "ring-buffer: Remove HAVE_64BIT_ALIGNED_ACCESS" 2021-03-16 16:43:47 +08:00