linux-stable.git/tools/include, branch linux-6.15.y

tools/nolibc: fix spelling of FD_SETBITMASK in FD_* macros

2025-08-20T16:36:34+00:00

commit a477629baa2a0e9991f640af418e8c973a1c08e3 upstream.

While nolibc-test does test syscalls, it doesn't test as much the rest
of the macros, and a wrong spelling of FD_SETBITMASK in commit
feaf75658783a broke programs using either FD_SET() or FD_CLR() without
being noticed. Let's fix these macros.

Fixes: feaf75658783a ("nolibc: fix fd_set type")
Cc: stable@vger.kernel.org # v6.2+
Acked-by: Thomas Weißschuh 
Signed-off-by: Willy Tarreau 
Signed-off-by: Greg Kroah-Hartman

tools/nolibc: define time_t in terms of __kernel_old_time_t

2025-08-20T16:35:55+00:00

[ Upstream commit d5094bcb5bfdfea2cf0de8aaf77cc65db56cbdb5 ]

Nolibc assumes that the kernel ABI is using a time values that are as
large as a long integer. For most ABIs this holds true.
But for x32 this is not correct, as it uses 32bit longs but 64bit times.

Also the 'struct stat' implementation of nolibc relies on timespec::tv_sec
and time_t being the same type. While timespec::tv_sec comes from the
kernel and is of type __kernel_old_time_t, time_t is defined within nolibc.

Switch to the __kernel_old_time_t to always get the correct type.

Signed-off-by: Thomas Weißschuh 
Link: https://lore.kernel.org/r/20250712-nolibc-x32-v1-1-6d81cb798710@weissschuh.net
Acked-by: Willy Tarreau 
Signed-off-by: Sasha Levin

kallsyms: fix build without execinfo

2025-07-17T16:43:50+00:00

commit a95743b53031b015e8949e845a9f6fdfb2656347 upstream.

Some libc's like musl libc don't provide execinfo.h since it's not part of
POSIX.  In order to fix compilation on musl, only include execinfo.h if
available (HAVE_BACKTRACE_SUPPORT)

This was discovered with c104c16073b7 ("Kunit to check the longest symbol
length") which starts to include linux/kallsyms.h with Alpine Linux'
configs.

Link: https://lkml.kernel.org/r/20250622014608.448718-1-fossdd@pwned.life
Fixes: c104c16073b7 ("Kunit to check the longest symbol length")
Signed-off-by: Achill Gilgenast 
Cc: Luis Henriques 
Cc: Greg Kroah-Hartman 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

bpf: Fix L4 csum update on IPv6 in CHECKSUM_COMPLETE

2025-06-19T13:40:39+00:00

[ Upstream commit ead7f9b8de65632ef8060b84b0c55049a33cfea1 ]

In Cilium, we use bpf_csum_diff + bpf_l4_csum_replace to, among other
things, update the L4 checksum after reverse SNATing IPv6 packets. That
use case is however not currently supported and leads to invalid
skb->csum values in some cases. This patch adds support for IPv6 address
changes in bpf_l4_csum_update via a new flag.

When calling bpf_l4_csum_replace in Cilium, it ends up calling
inet_proto_csum_replace_by_diff:

    1:  void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb,
    2:                                       __wsum diff, bool pseudohdr)
    3:  {
    4:      if (skb->ip_summed != CHECKSUM_PARTIAL) {
    5:          csum_replace_by_diff(sum, diff);
    6:          if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
    7:              skb->csum = ~csum_sub(diff, skb->csum);
    8:      } else if (pseudohdr) {
    9:          *sum = ~csum_fold(csum_add(diff, csum_unfold(*sum)));
    10:     }
    11: }

The bug happens when we're in the CHECKSUM_COMPLETE state. We've just
updated one of the IPv6 addresses. The helper now updates the L4 header
checksum on line 5. Next, it updates skb->csum on line 7. It shouldn't.

For an IPv6 packet, the updates of the IPv6 address and of the L4
checksum will cancel each other. The checksums are set such that
computing a checksum over the packet including its checksum will result
in a sum of 0. So the same is true here when we update the L4 checksum
on line 5. We'll update it as to cancel the previous IPv6 address
update. Hence skb->csum should remain untouched in this case.

The same bug doesn't affect IPv4 packets because, in that case, three
fields are updated: the IPv4 address, the IP checksum, and the L4
checksum. The change to the IPv4 address and one of the checksums still
cancel each other in skb->csum, but we're left with one checksum update
and should therefore update skb->csum accordingly. That's exactly what
inet_proto_csum_replace_by_diff does.

This special case for IPv6 L4 checksums is also described atop
inet_proto_csum_replace16, the function we should be using in this case.

This patch introduces a new bpf_l4_csum_replace flag, BPF_F_IPV6,
to indicate that we're updating the L4 checksum of an IPv6 packet. When
the flag is set, inet_proto_csum_replace_by_diff will skip the
skb->csum update.

Fixes: 7d672345ed295 ("bpf: add generic bpf_csum_diff helper")
Signed-off-by: Paul Chaignon 
Acked-by: Daniel Borkmann 
Link: https://patch.msgid.link/96a6bc3a443e6f0b21ff7b7834000e17fb549e05.1748509484.git.paul.chaignon@gmail.com
Signed-off-by: Jakub Kicinski 
Signed-off-by: Sasha Levin

bpf: Clarify the meaning of BPF_F_PSEUDO_HDR

2025-06-19T13:40:39+00:00

[ Upstream commit 5a15a050df714959f0d5a57ac3201bd1c6594984 ]

In the bpf_l4_csum_replace helper, the BPF_F_PSEUDO_HDR flag should only
be set if the modified header field is part of the pseudo-header.

If you modify for example the UDP ports and pass BPF_F_PSEUDO_HDR,
inet_proto_csum_replace4 will update skb->csum even though it shouldn't
(the port and the UDP checksum updates null each other).

Signed-off-by: Paul Chaignon 
Link: https://lore.kernel.org/r/5126ef84ba75425b689482cbc98bffe75e5d8ab0.1744102490.git.paul.chaignon@gmail.com
Signed-off-by: Alexei Starovoitov 
Stable-dep-of: ead7f9b8de65 ("bpf: Fix L4 csum update on IPv6 in CHECKSUM_COMPLETE")
Signed-off-by: Sasha Levin

bpf: Clarify handling of mark and tstamp by redirect_peer

2025-05-08T01:16:33+00:00

When switching network namespaces with the bpf_redirect_peer helper, the
skb->mark and skb->tstamp fields are not zeroed out like they can be on
a typical netns switch. This patch clarifies that in the helper
description.

Signed-off-by: Paul Chaignon 
Acked-by: Daniel Borkmann 
Acked-by: Martin KaFai Lau 
Link: https://patch.msgid.link/ccc86af26d43c5c0b776bcba2601b7479c0d46d0.1746460653.git.paul.chaignon@gmail.com
Signed-off-by: Jakub Kicinski

tools headers: Update the arch/x86/lib/memset_64.S copy with the kernel sources

2025-04-10T16:28:25+00:00

To pick up the changes in:

  2981557cb0408e14 x86,kcfi: Fix EXPORT_SYMBOL vs kCFI

That required adding a copy of include/linux/cfi_types.h and its checking
in tools/perf/check-headers.h.

Addressing this perf tools build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/arch/x86/lib/memset_64.S arch/x86/lib/memset_64.S

Please see tools/include/uapi/README for further details.

Acked-by: Ingo Molnar 
Tested-by: Venkat Rao Bagalkote 
Cc: x86@kernel.org
Link: https://lore.kernel.org/r/20250410001125.391820-11-namhyung@kernel.org
Signed-off-by: Namhyung Kim

tools headers: Update the uapi/asm-generic/mman-common.h copy with the kernel sources

2025-04-10T16:28:24+00:00

To pick up the changes in:

   6d61527d931ba07b mm/pkey: Add PKEY_UNRESTRICTED macro

Addressing this perf tools build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/asm-generic/mman-common.h include/uapi/asm-generic/mman-common.h

Please see tools/include/uapi/README for further details.

Acked-by: Ingo Molnar 
Tested-by: Venkat Rao Bagalkote 
Cc: linux-arch@vger.kernel.org
Link: https://lore.kernel.org/r/20250410001125.391820-8-namhyung@kernel.org
Signed-off-by: Namhyung Kim

tools headers: Update the syscall table with the kernel sources

2025-04-10T16:28:24+00:00

To pick up the changes in:

  c4a16820d9019940 fs: add open_tree_attr()
  2df1ad0d25803399 x86/arch_prctl: Simplify sys_arch_prctl()
  e632bca07c8eef1d arm64: generate 64-bit syscall.tbl

This is basically to support the new open_tree_attr syscall.  But it
also needs to update asm-generic unistd.h header to get the new syscall
number.  And arm64 unistd.h header was converted to use the generic
64-bit header.

Addressing this perf tools build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/scripts/syscall.tbl scripts/syscall.tbl
    diff -u tools/perf/arch/x86/entry/syscalls/syscall_32.tbl arch/x86/entry/syscalls/syscall_32.tbl
    diff -u tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/x86/entry/syscalls/syscall_64.tbl
    diff -u tools/perf/arch/powerpc/entry/syscalls/syscall.tbl arch/powerpc/kernel/syscalls/syscall.tbl
    diff -u tools/perf/arch/s390/entry/syscalls/syscall.tbl arch/s390/kernel/syscalls/syscall.tbl
    diff -u tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl arch/mips/kernel/syscalls/syscall_n64.tbl
    diff -u tools/perf/arch/arm/entry/syscalls/syscall.tbl arch/arm/tools/syscall.tbl
    diff -u tools/perf/arch/sh/entry/syscalls/syscall.tbl arch/sh/kernel/syscalls/syscall.tbl
    diff -u tools/perf/arch/sparc/entry/syscalls/syscall.tbl arch/sparc/kernel/syscalls/syscall.tbl
    diff -u tools/perf/arch/xtensa/entry/syscalls/syscall.tbl arch/xtensa/kernel/syscalls/syscall.tbl
    diff -u tools/arch/arm64/include/uapi/asm/unistd.h arch/arm64/include/uapi/asm/unistd.h
    diff -u tools/include/uapi/asm-generic/unistd.h include/uapi/asm-generic/unistd.h

Please see tools/include/uapi/README for further details.

Acked-by: Ingo Molnar 
Tested-by: Venkat Rao Bagalkote 
Cc: linux-arch@vger.kernel.org
Link: https://lore.kernel.org/r/20250410001125.391820-6-namhyung@kernel.org
Signed-off-by: Namhyung Kim

tools headers: Update the VFS headers with the kernel sources

2025-04-10T16:28:24+00:00

To pick up the changes in:

  7ed6cbe0f8caa6ee fs: add STATX_DIO_READ_ALIGN
  8fc7e23a9bd851e6 fs: reformat the statx definition
  a5874fde3c0884a3 exec: Add a new AT_EXECVE_CHECK flag to execveat(2)
  1ebd4a3c095cd538 blk-crypto: add ioctls to create and prepare hardware-wrapped keys
  af6505e5745b9f3a fs: add RWF_DONTCACHE iocb and FOP_DONTCACHE file_operations flag
  10783d0ba0d7731e fs, iov_iter: define meta io descriptor
  8f6116b5b77b0536 statmount: add a new supported_mask field
  37c4a9590e1efcae statmount: allow to retrieve idmappings

Addressing this perf tools build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/linux/stat.h include/uapi/linux/stat.h
    diff -u tools/perf/trace/beauty/include/uapi/linux/stat.h include/uapi/linux/stat.h
    diff -u tools/perf/trace/beauty/include/uapi/linux/fcntl.h include/uapi/linux/fcntl.h
    diff -u tools/perf/trace/beauty/include/uapi/linux/fs.h include/uapi/linux/fs.h
    diff -u tools/perf/trace/beauty/include/uapi/linux/mount.h include/uapi/linux/mount.h

Please see tools/include/uapi/README for further details.

Acked-by: Ingo Molnar 
Tested-by: Venkat Rao Bagalkote 
Cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/20250410001125.391820-5-namhyung@kernel.org
Signed-off-by: Namhyung Kim