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It also unnecessarily exposes a large number of kernel implementation details. For more information about AF_ALG, see :ref:`Documentation/crypto/userspace-if.rst `.”h]”(hŒßAF_ALG is a deprecated and rarely-used userspace interface that is a frequent source of vulnerabilities. It also unnecessarily exposes a large number of kernel implementation details. For more information about AF_ALG, see ”…””}”(hjÁh²hh³Nh´Nubh)”}”(hŒI:ref:`Documentation/crypto/userspace-if.rst `”h]”hŒinline”“”)”}”(hjËh]”hŒ%Documentation/crypto/userspace-if.rst”…””}”(hjÏh²hh³Nh´Nubah}”(h]”h ]”(Œxref”Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jÍhjÉubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”Œadmin-guide/sysctl/crypto”Œ refdomain”jÚŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆŒ reftarget”Œcrypto_userspace_interface”uh1hh³hÊh´KhjÁubhŒ.”…””}”(hjÁh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khj¢h²hubhÌ)”}”(hXStarting in Linux v7.3, AF_ALG supports only a limited set of algorithms by default. This sysctl allows the system administrator to remove this restriction when needed for compatibility reasons, or to go further and disable AF_ALG entirely. The default value is 1.”h]”hXStarting in Linux v7.3, AF_ALG supports only a limited set of algorithms by default. This sysctl allows the system administrator to remove this restriction when needed for compatibility reasons, or to go further and disable AF_ALG entirely. The default value is 1.”…””}”(hjøh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khj¢h²hubhŒtable”“”)”}”(hhh]”hŒtgroup”“”)”}”(hhh]”(hŒcolspec”“”)”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”Œcolwidth”Kuh1jhj ubj)”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”Œcolwidth”KBuh1jhj ubhŒtbody”“”)”}”(hhh]”(hŒrow”“”)”}”(hhh]”(hŒentry”“”)”}”(hhh]”hÌ)”}”(hŒ0”h]”hŒ0”…””}”(hj5h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khj2ubah}”(h]”h ]”h"]”h$]”h&]”uh1j0hj-ubj1)”}”(hhh]”hÌ)”}”(hŒAF_ALG is unrestricted.”h]”hŒAF_ALG is unrestricted.”…””}”(hjLh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KhjIubah}”(h]”h ]”h"]”h$]”h&]”uh1j0hj-ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(ubj,)”}”(hhh]”(j1)”}”(hhh]”hÌ)”}”(hŒ1”h]”hŒ1”…””}”(hjlh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khjiubah}”(h]”h ]”h"]”h$]”h&]”uh1j0hjfubj1)”}”(hhh]”(hÌ)”}”(hŒ¾AF_ALG is supported with a limited list of algorithms. The list is designed for compatibility with known users such as iwd and bluez that haven't yet been fixed to use userspace crypto code.”h]”hŒÀAF_ALG is supported with a limited list of algorithms. The list is designed for compatibility with known users such as iwd and bluez that haven’t yet been fixed to use userspace crypto code.”…””}”(hjƒh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khj€ubhÌ)”}”(hŒ´Specifically, there is an allowlist for unprivileged processes and a somewhat longer allowlist for processes that hold CAP_SYS_ADMIN or CAP_NET_ADMIN in the initial user namespace.”h]”hŒ´Specifically, there is an allowlist for unprivileged processes and a somewhat longer allowlist for processes that hold CAP_SYS_ADMIN or CAP_NET_ADMIN in the initial user namespace.”…””}”(hj‘h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K#hj€ubhÌ)”}”(hŒQAttempts to bind() an AF_ALG socket with a disallowed algorithm fail with ENOENT.”h]”hŒQAttempts to bind() an AF_ALG socket with a disallowed algorithm fail with ENOENT.”…””}”(hjŸh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K'hj€ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j0hjfubeh}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(ubj,)”}”(hhh]”(j1)”}”(hhh]”hÌ)”}”(hŒ2”h]”hŒ2”…””}”(hj¿h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K*hj¼ubah}”(h]”h ]”h"]”h$]”h&]”uh1j0hj¹ubj1)”}”(hhh]”hÌ)”}”(hŒZAF_ALG is completely disabled. Attempts to create an AF_ALG socket fail with EAFNOSUPPORT.”h]”hŒZAF_ALG is completely disabled. Attempts to create an AF_ALG socket fail with EAFNOSUPPORT.”…””}”(hjÖh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K*hjÓubah}”(h]”h ]”h"]”h$]”h&]”uh1j0hj¹ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j&hj ubeh}”(h]”h ]”h"]”h$]”h&]”Œcols”Kuh1j hjubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj¢h²hh³hÊh´Nubeh}”(h]”(jŒid1”eh ]”h"]”Œaf_alg_restrict”ah$]”Œaf_alg_restrict”ah&]”uh1hµhh·h²hh³hÊh´K Œ referenced”KŒexpect_referenced_by_name”}”jj—sŒexpect_referenced_by_id”}”jj—subh¶)”}”(hhh]”(h»)”}”(hŒ fips_enabled”h]”hŒ fips_enabled”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”j¡j.uh1hºhjh²hh³hÊh´K/ubhÌ)”}”(hŒ;Read-only flag that indicates whether FIPS mode is enabled.”h]”hŒ;Read-only flag that indicates whether FIPS mode is enabled.”…””}”(hj"h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K1hjh²hubhõ)”}”(hhh]”(hú)”}”(hŒ'``0``: FIPS mode is disabled (default).”h]”hÌ)”}”(hj5h]”(hÖ)”}”(hŒ``0``”h]”hŒ0”…””}”(hj:h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhj7ubhŒ": FIPS mode is disabled (default).”…””}”(hj7h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K3hj3ubah}”(h]”h ]”h"]”h$]”h&]”uh1hùhj0h²hh³hÊh´Nubhú)”}”(hŒ``1``: FIPS mode is enabled. ”h]”hÌ)”}”(hŒ``1``: FIPS mode is enabled.”h]”(hÖ)”}”(hŒ``1``”h]”hŒ1”…””}”(hj`h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhj\ubhŒ: FIPS mode is enabled.”…””}”(hj\h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K4hjXubah}”(h]”h ]”h"]”h$]”h&]”uh1hùhj0h²hh³hÊh´Nubeh}”(h]”h ]”h"]”h$]”h&]”Œbullet”Œ-”uh1hôh³hÊh´K3hjh²hubhÌ)”}”(hXyThis value is set at boot time via the ``fips=1`` kernel command line parameter. When enabled, the cryptographic API will restrict the use of certain algorithms and perform self-tests to ensure compliance with FIPS (Federal Information Processing Standards) requirements, such as FIPS 140-2 and the newer FIPS 140-3, depending on the kernel configuration and the module in use.”h]”(hŒ'This value is set at boot time via the ”…””}”(hj†h²hh³Nh´NubhÖ)”}”(hŒ ``fips=1``”h]”hŒfips=1”…””}”(hjŽh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhj†ubhXH kernel command line parameter. When enabled, the cryptographic API will restrict the use of certain algorithms and perform self-tests to ensure compliance with FIPS (Federal Information Processing Standards) requirements, such as FIPS 140-2 and the newer FIPS 140-3, depending on the kernel configuration and the module in use.”…””}”(hj†h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K6hjh²hubeh}”(h]”j4ah ]”h"]”Œ fips_enabled”ah$]”h&]”uh1hµhh·h²hh³hÊh´K/ubh¶)”}”(hhh]”(h»)”}”(hŒ fips_name”h]”hŒ fips_name”…””}”(hj°h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”j¡jPuh1hºhj­h²hh³hÊh´K>ubhÌ)”}”(hŒ­Read-only file that contains the name of the FIPS module currently in use. The value is typically configured via the ``CONFIG_CRYPTO_FIPS_NAME`` kernel configuration option.”h]”(hŒuRead-only file that contains the name of the FIPS module currently in use. The value is typically configured via the ”…””}”(hj¾h²hh³Nh´NubhÖ)”}”(hŒ``CONFIG_CRYPTO_FIPS_NAME``”h]”hŒCONFIG_CRYPTO_FIPS_NAME”…””}”(hjÆh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhj¾ubhŒ kernel configuration option.”…””}”(hj¾h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K@hj­h²hubeh}”(h]”jVah ]”h"]”Œ fips_name”ah$]”h&]”uh1hµhh·h²hh³hÊh´K>ubh¶)”}”(hhh]”(h»)”}”(hŒ fips_version”h]”hŒ fips_version”…””}”(hjèh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”j¡jruh1hºhjåh²hh³hÊh´KEubhÌ)”}”(hŒóRead-only file that contains the version string of the FIPS module. If ``CONFIG_CRYPTO_FIPS_CUSTOM_VERSION`` is set, it uses the value from ``CONFIG_CRYPTO_FIPS_VERSION``. Otherwise, it defaults to the kernel release version (``UTS_RELEASE``).”h]”(hŒGRead-only file that contains the version string of the FIPS module. If ”…””}”(hjöh²hh³Nh´NubhÖ)”}”(hŒ%``CONFIG_CRYPTO_FIPS_CUSTOM_VERSION``”h]”hŒ!CONFIG_CRYPTO_FIPS_CUSTOM_VERSION”…””}”(hjþh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjöubhŒ is set, it uses the value from ”…””}”(hjöh²hh³Nh´NubhÖ)”}”(hŒ``CONFIG_CRYPTO_FIPS_VERSION``”h]”hŒCONFIG_CRYPTO_FIPS_VERSION”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjöubhŒ8. Otherwise, it defaults to the kernel release version (”…””}”(hjöh²hh³Nh´NubhÖ)”}”(hŒ``UTS_RELEASE``”h]”hŒ UTS_RELEASE”…””}”(hj"h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjöubhŒ).”…””}”(hjöh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KGhjåh²hubhÌ)”}”(hŒHCopyright (c) 2026, Shubham Chakraborty ”h]”(hŒ)Copyright (c) 2026, Shubham Chakraborty <”…””}”(hj:h²hh³Nh´Nubj)”}”(hŒchakrabortyshubham66@gmail.com”h]”hŒchakrabortyshubham66@gmail.com”…””}”(hjBh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œ%mailto:chakrabortyshubham66@gmail.com”uh1jhj:ubhŒ>”…””}”(hj:h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KLhjåh²hubhÌ)”}”(hŒ\For general info and legal blurb, please look in Documentation/admin-guide/sysctl/index.rst.”h]”hŒ\For general info and legal blurb, please look in Documentation/admin-guide/sysctl/index.rst.”…””}”(hj\h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KNhjåh²hubhŒcomment”“”)”}”(hŒ6See scripts/check-sysctl-docs to keep this up to date:”h]”hŒ6See scripts/check-sysctl-docs to keep this up to date:”…””}”hjlsbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1jjhjåh²hh³hÊh´KQubjk)”}”(hŒ,scripts/check-sysctl-docs -vtable="crypto" \”h]”hŒ,scripts/check-sysctl-docs -vtable="crypto" \”…””}”hj|sbah}”(h]”h ]”h"]”h$]”h&]”jzj{uh1jjhjåh²hh³hÊh´KRubjk)”}”(hŒ$(git grep -l register_sysctl_)”h]”hŒ$(git grep -l register_sysctl_)”…””}”hjŠsbah}”(h]”h ]”h"]”h$]”h&]”jzj{uh1jjhjåh²hh³hÊh´KSubeh}”(h]”jxah ]”h"]”Œ fips_version”ah$]”h&]”uh1hµhh·h²hh³hÊh´KEubeh}”(h]”Œproc-sys-crypto”ah ]”h"]”Œ/proc/sys/crypto/”ah$]”h&]”uh1hµhhh²hh³hÊh´Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”hÊuh1hŒcurrent_source”NŒ current_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(hºNŒ generator”NŒ datestamp”NŒ source_link”NŒ source_url”NŒ toc_backlinks”j0Œfootnote_backlinks”KŒ sectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒ strip_classes”NŒ report_level”KŒ halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ traceback”ˆŒinput_encoding”Œ utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”jÉŒerror_encoding”Œutf-8”Œerror_encoding_error_handler”Œbackslashreplace”Œ language_code”Œen”Œrecord_dependencies”NŒconfig”NŒ id_prefix”hŒauto_id_prefix”Œid”Œ dump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”hÊŒ _destination”NŒ _config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒfile_insertion_enabled”ˆŒ raw_enabled”KŒline_length_limit”M'Œpep_references”NŒ pep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒ rfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ tab_width”KŒtrim_footnote_reference_space”‰Œsyntax_highlight”Œlong”Œ smart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œ docinfo_xform”KŒsectsubtitle_xform”‰Œ image_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œrefids”}”j]”j—asŒnameids”}”(j¤j¡j’jjjjªj4jâjVjœjxuŒ nametypes”}”(j¤‰j’‰jˆjª‰jâ‰jœ‰uh}”(j¡h·jhñjj¢jj¢j4jjVj­jxjåj jj.j%jPjGjrjiuŒ footnote_refs”}”Œ citation_refs”}”Œ autofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ footnotes”]”Œ citations”]”Œautofootnote_start”KŒsymbol_footnote_start”KŒ id_counter”Œ collections”ŒCounter”“”}”j×Ks…”R”Œparse_messages”]”hŒsystem_message”“”)”}”(hhh]”hÌ)”}”(hŒ2Duplicate implicit target name: "af_alg_restrict".”h]”hŒ6Duplicate implicit target name: “af_alg_restrictâ€.”…””}”(hj1h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËhj.ubah}”(h]”h ]”h"]”h$]”h&]”jaŒlevel”KŒtype”ŒINFO”Œsource”hÊŒline”K uh1j,hj¢h²hh³hÊh´K ubaŒtransform_messages”]”j-)”}”(hhh]”hÌ)”}”(hhh]”hŒ5Hyperlink target "af-alg-restrict" is not referenced.”…””}”hjOsbah}”(h]”h ]”h"]”h$]”h&]”uh1hËhjLubah}”(h]”h ]”h"]”h$]”h&]”Œlevel”KŒtype”jGŒsource”hÊŒline”K uh1j,ubaŒ transformer”NŒ include_log”]”Œ decoration”Nh²hub.