linux-stable.git/tools/include, branch v5.10.142

selftests/bpf: Extend verifier and bpf_sock tests for dst_port loads

2022-08-11T11:06:44+00:00

commit 8f50f16ff39dd4e2d43d1548ca66925652f8aff7 upstream.

Add coverage to the verifier tests and tests for reading bpf_sock fields to
ensure that 32-bit, 16-bit, and 8-bit loads from dst_port field are allowed
only at intended offsets and produce expected values.

While 16-bit and 8-bit access to dst_port field is straight-forward, 32-bit
wide loads need be allowed and produce a zero-padded 16-bit value for
backward compatibility.

Signed-off-by: Jakub Sitnicki 
Link: https://lore.kernel.org/r/20220130115518.213259-3-jakub@cloudflare.com
Signed-off-by: Alexei Starovoitov 
[OP: backport to 5.10: adjusted context in sock_fields.c]
Signed-off-by: Ovidiu Panait 
Signed-off-by: Greg Kroah-Hartman

bpf: Add PROG_TEST_RUN support for sk_lookup programs

2022-08-03T10:00:52+00:00

commit 7c32e8f8bc33a5f4b113a630857e46634e3e143b upstream.

Allow to pass sk_lookup programs to PROG_TEST_RUN. User space
provides the full bpf_sk_lookup struct as context. Since the
context includes a socket pointer that can't be exposed
to user space we define that PROG_TEST_RUN returns the cookie
of the selected socket or zero in place of the socket pointer.

We don't support testing programs that select a reuseport socket,
since this would mean running another (unrelated) BPF program
from the sk_lookup test handler.

Signed-off-by: Lorenz Bauer 
Signed-off-by: Alexei Starovoitov 
Link: https://lore.kernel.org/bpf/20210303101816.36774-3-lmb@cloudflare.com
Signed-off-by: Tianchen Ding 
Signed-off-by: Greg Kroah-Hartman

tools headers: Remove broken definition of __LITTLE_ENDIAN

2022-07-25T09:26:56+00:00

commit fa2c02e5798c17c89cbb3135940086ebe07e5c9f upstream.

The linux/kconfig.h file was copied from the kernel but the line where
with the generated/autoconf.h include from where the CONFIG_ entries
would come from was deleted, as tools/ build system don't create that
file, so we ended up always defining just __LITTLE_ENDIAN as
CONFIG_CPU_BIG_ENDIAN was nowhere to be found.

This in turn ended up breaking the build in some systems where
__LITTLE_ENDIAN was already defined, such as the androind NDK.

So just ditch that block that depends on the CONFIG_CPU_BIG_ENDIAN
define.

The kconfig.h file was copied just to get IS_ENABLED() and a
'make -C tools/all' doesn't breaks with this removal.

Fixes: 93281c4a96572a34 ("x86/insn: Add an insn_decode() API")
Cc: Adrian Hunter 
Cc: Borislav Petkov 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Link: http://lore.kernel.org/lkml/YO8hK7lqJcIWuBzx@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Greg Kroah-Hartman

tools arch: Update arch/x86/lib/mem{cpy,set}_64.S copies used in 'perf bench mem memcpy' - again

2022-07-25T09:26:56+00:00

commit fb24e308b6310541e70d11a3f19dc40742974b95 upstream.

To bring in the change made in this cset:

 5e21a3ecad1500e3 ("x86/alternative: Merge include files")

This just silences these perf tools build warnings, no change in the tools:

  Warning: Kernel ABI header at 'tools/arch/x86/lib/memcpy_64.S' differs from latest version at 'arch/x86/lib/memcpy_64.S'
  diff -u tools/arch/x86/lib/memcpy_64.S arch/x86/lib/memcpy_64.S
  Warning: Kernel ABI header at 'tools/arch/x86/lib/memset_64.S' differs from latest version at 'arch/x86/lib/memset_64.S'
  diff -u tools/arch/x86/lib/memset_64.S arch/x86/lib/memset_64.S

Cc: Borislav Petkov 
Cc: Juergen Gross 
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Greg Kroah-Hartman

objtool: Re-add UNWIND_HINT_{SAVE_RESTORE}

2022-07-25T09:26:47+00:00

commit 8faea26e611189e933ea2281975ff4dc7c1106b6 upstream.

Commit

  c536ed2fffd5 ("objtool: Remove SAVE/RESTORE hints")

removed the save/restore unwind hints because they were no longer
needed. Now they're going to be needed again so re-add them.

Signed-off-by: Josh Poimboeuf 
Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Borislav Petkov 
Signed-off-by: Thadeu Lima de Souza Cascardo 
Signed-off-by: Ben Hutchings 
Signed-off-by: Greg Kroah-Hartman

objtool: Add entry UNRET validation

2022-07-25T09:26:45+00:00

commit a09a6e2399ba0595c3042b3164f3ca68a3cff33e upstream.

Since entry asm is tricky, add a validation pass that ensures the
retbleed mitigation has been done before the first actual RET
instruction.

Entry points are those that either have UNWIND_HINT_ENTRY, which acts
as UNWIND_HINT_EMPTY but marks the instruction as an entry point, or
those that have UWIND_HINT_IRET_REGS at +0.

This is basically a variant of validate_branch() that is
intra-function and it will simply follow all branches from marked
entry points and ensures that all paths lead to ANNOTATE_UNRET_END.

If a path hits RET or an indirection the path is a fail and will be
reported.

There are 3 ANNOTATE_UNRET_END instances:

 - UNTRAIN_RET itself
 - exception from-kernel; this path doesn't need UNTRAIN_RET
 - all early exceptions; these also don't need UNTRAIN_RET

Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Borislav Petkov 
Reviewed-by: Josh Poimboeuf 
Signed-off-by: Borislav Petkov 
[cascardo: arch/x86/entry/entry_64.S no pt_regs return at .Lerror_entry_done_lfence]
[cascardo: tools/objtool/builtin-check.c no link option validation]
[cascardo: tools/objtool/check.c opts.ibt is ibt]
[cascardo: tools/objtool/include/objtool/builtin.h leave unret option as bool, no struct opts]
[cascardo: objtool is still called from scripts/link-vmlinux.sh]
[cascardo: no IBT support]
Signed-off-by: Thadeu Lima de Souza Cascardo 
[bwh: Backported to 5.10:
 - In scripts/link-vmlinux.sh, use "test -n" instead of is_enabled
 - Adjust context]
Signed-off-by: Ben Hutchings 
Signed-off-by: Greg Kroah-Hartman

x86/insn: Add an insn_decode() API

2022-07-25T09:26:11+00:00

commit 93281c4a96572a34504244969b938e035204778d upstream.

Users of the instruction decoder should use this to decode instruction
bytes. For that, have insn*() helpers return an int value to denote
success/failure. When there's an error fetching the next insn byte and
the insn falls short, return -ENODATA to denote that.

While at it, make insn_get_opcode() more stricter as to whether what has
seen so far is a valid insn and if not.

Copy linux/kconfig.h for the tools-version of the decoder so that it can
use IS_ENABLED().

Also, cast the INSN_MODE_KERN dummy define value to (enum insn_mode)
for tools use of the decoder because perf tool builds with -Werror and
errors out with -Werror=sign-compare otherwise.

Signed-off-by: Borislav Petkov 
Acked-by: Masami Hiramatsu 
Link: https://lkml.kernel.org/r/20210304174237.31945-5-bp@alien8.de
Signed-off-by: Ben Hutchings 
Signed-off-by: Greg Kroah-Hartman

objtool: Combine UNWIND_HINT_RET_OFFSET and UNWIND_HINT_FUNC

2022-07-25T09:26:07+00:00

commit b735bd3e68824316655252a931a3353a6ebc036f upstream.

The ORC metadata generated for UNWIND_HINT_FUNC isn't actually very
func-like.  With certain usages it can cause stack state mismatches
because it doesn't set the return address (CFI_RA).

Also, users of UNWIND_HINT_RET_OFFSET no longer need to set a custom
return stack offset.  Instead they just need to specify a func-like
situation, so the current ret_offset code is hacky for no good reason.

Solve both problems by simplifying the RET_OFFSET handling and
converting it into a more useful UNWIND_HINT_FUNC.

If we end up needing the old 'ret_offset' functionality again in the
future, we should be able to support it pretty easily with the addition
of a custom 'sp_offset' in UNWIND_HINT_FUNC.

Signed-off-by: Josh Poimboeuf 
Link: https://lore.kernel.org/r/db9d1f5d79dddfbb3725ef6d8ec3477ad199948d.1611263462.git.jpoimboe@redhat.com
[bwh: Backported to 5.10:
 - Don't use bswap_if_needed() since we don't have any of the other fixes
   for mixed-endian cross-compilation
 - Adjust context]
Signed-off-by: Ben Hutchings 
Signed-off-by: Greg Kroah-Hartman

bpf: Fix comment for helper bpf_current_task_under_cgroup()

2022-04-08T12:40:43+00:00

commit 58617014405ad5c9f94f464444f4972dabb71ca7 upstream.

Fix the descriptions of the return values of helper bpf_current_task_under_cgroup().

Fixes: c6b5fb8690fa ("bpf: add documentation for eBPF helpers (42-50)")
Signed-off-by: Hengqi Chen 
Signed-off-by: Daniel Borkmann 
Acked-by: Yonghong Song 
Link: https://lore.kernel.org/bpf/20220310155335.1278783-1-hengqi.chen@gmail.com
Signed-off-by: Greg Kroah-Hartman

tools/nolibc: fix incorrect truncation of exit code

2022-01-27T09:53:42+00:00

commit de0244ae40ae91145faaf164a4252347607c3711 upstream.

Ammar Faizi reported that our exit code handling is wrong. We truncate
it to the lowest 8 bits but the syscall itself is expected to take a
regular 32-bit signed integer, not an unsigned char. It's the kernel
that later truncates it to the lowest 8 bits. The difference is visible
in strace, where the program below used to show exit(255) instead of
exit(-1):

  int main(void)
  {
        return -1;
  }

This patch applies the fix to all archs. x86_64, i386, arm64, armv7 and
mips were all tested and confirmed to work fine now. Risc-v was not
tested but the change is trivial and exactly the same as for other archs.

Reported-by: Ammar Faizi 
Cc: stable@vger.kernel.org
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney 
Signed-off-by: Greg Kroah-Hartman