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c2a756891b
The uAPI stddef header includes compiler_types.h, a kernel-only header, to make sure that kernel definitions of annotations like __counted_by() take precedence. There is a hack in scripts/headers_install.sh which strips includes of compiler.h and compiler_types.h when installing uAPI headers. While explicit handling makes sense for compiler.h, which is included all over the uAPI, compiler_types.h is only included by stddef.h (within the uAPI, obviously it's included in kernel code a lot). Remove the stripping from scripts/headers_install.sh and wrap the include of compiler_types.h in #ifdef __KERNEL__ instead. This should be equivalent functionally, but is easier to understand to a casual reader of the code. It also makes it easier to work with kernel headers directly from under tools/ Signed-off-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20250825201828.2370083-1-kuba@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
102 lines
2.7 KiB
Bash
Executable file
102 lines
2.7 KiB
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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if [ $# -ne 2 ]
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then
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echo "Usage: headers_install.sh INFILE OUTFILE"
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echo
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echo "Prepares kernel header files for use by user space, by removing"
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echo "all compiler.h definitions and #includes, removing any"
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echo "#ifdef __KERNEL__ sections, and putting __underscores__ around"
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echo "asm/inline/volatile keywords."
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echo
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echo "INFILE: header file to operate on"
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echo "OUTFILE: output file which the processed header is written to"
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exit 1
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fi
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# Grab arguments
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INFILE=$1
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OUTFILE=$2
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TMPFILE=$OUTFILE.tmp
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trap 'rm -f $OUTFILE $TMPFILE' EXIT
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# SPDX-License-Identifier with GPL variants must have "WITH Linux-syscall-note"
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if [ -n "$(sed -n -e "/SPDX-License-Identifier:.*GPL-/{/WITH Linux-syscall-note/!p}" $INFILE)" ]; then
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echo "error: $INFILE: missing \"WITH Linux-syscall-note\" for SPDX-License-Identifier" >&2
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exit 1
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fi
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sed -E -e '
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s/([[:space:](])(__user|__force|__iomem)[[:space:]]/\1/g
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s/__attribute_const__([[:space:]]|$)/\1/g
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s@^#include <linux/compiler.h>@@
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s/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\1__attribute__((packed))\2/g
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s/(^|[[:space:](])(inline|asm|volatile)([[:space:](]|$)/\1__\2__\3/g
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s@#(ifndef|define|endif[[:space:]]*/[*])[[:space:]]*_UAPI@#\1 @
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' $INFILE > $TMPFILE || exit 1
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scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ $TMPFILE > $OUTFILE
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[ $? -gt 1 ] && exit 1
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# Remove /* ... */ style comments, and find CONFIG_ references in code
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configs=$(sed -e '
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:comment
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s:/\*[^*][^*]*:/*:
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s:/\*\*\**\([^/]\):/*\1:
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t comment
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s:/\*\*/: :
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t comment
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/\/\*/! b check
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N
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b comment
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:print
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P
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D
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:check
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s:^\(CONFIG_[[:alnum:]_]*\):\1\n:
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t print
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s:^[[:alnum:]_][[:alnum:]_]*::
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s:^[^[:alnum:]_][^[:alnum:]_]*::
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t check
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d
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' $OUTFILE)
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# The entries in the following list do not result in an error.
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# Please do not add a new entry. This list is only for existing ones.
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# The list will be reduced gradually, and deleted eventually. (hopefully)
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#
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# The format is <file-name>:<CONFIG-option> in each line.
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config_leak_ignores="
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arch/arc/include/uapi/asm/page.h:CONFIG_ARC_PAGE_SIZE_16K
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arch/arc/include/uapi/asm/page.h:CONFIG_ARC_PAGE_SIZE_4K
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arch/arc/include/uapi/asm/swab.h:CONFIG_ARC_HAS_SWAPE
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arch/arm/include/uapi/asm/ptrace.h:CONFIG_CPU_ENDIAN_BE8
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arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_NO
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arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_SUPPORT
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arch/x86/include/uapi/asm/auxvec.h:CONFIG_IA32_EMULATION
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arch/x86/include/uapi/asm/auxvec.h:CONFIG_X86_64
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"
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for c in $configs
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do
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leak_error=1
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for ignore in $config_leak_ignores
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do
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if echo "$INFILE:$c" | grep -q "$ignore$"; then
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leak_error=
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break
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fi
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done
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if [ "$leak_error" = 1 ]; then
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echo "error: $INFILE: leak $c to user-space" >&2
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exit 1
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fi
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done
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rm -f $TMPFILE
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trap - EXIT
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