Kumar Kartikeya Dwivedi 2706053173 bpf: Rework process_dynptr_func ... Recently, user ringbuf support introduced a PTR_TO_DYNPTR register type for use in callback state, because in case of user ringbuf helpers, there is no dynptr on the stack that is passed into the callback. To reflect such a state, a special register type was created. However, some checks have been bypassed incorrectly during the addition of this feature. First, for arg_type with MEM_UNINIT flag which initialize a dynptr, they must be rejected for such register type. Secondly, in the future, there are plans to add dynptr helpers that operate on the dynptr itself and may change its offset and other properties. In all of these cases, PTR_TO_DYNPTR shouldn't be allowed to be passed to such helpers, however the current code simply returns 0. The rejection for helpers that release the dynptr is already handled. For fixing this, we take a step back and rework existing code in a way that will allow fitting in all classes of helpers and have a coherent model for dealing with the variety of use cases in which dynptr is used. First, for ARG_PTR_TO_DYNPTR, it can either be set alone or together with a DYNPTR_TYPE_* constant that denotes the only type it accepts. Next, helpers which initialize a dynptr use MEM_UNINIT to indicate this fact. To make the distinction clear, use MEM_RDONLY flag to indicate that the helper only operates on the memory pointed to by the dynptr, not the dynptr itself. In C parlance, it would be equivalent to taking the dynptr as a point to const argument. When either of these flags are not present, the helper is allowed to mutate both the dynptr itself and also the memory it points to. Currently, the read only status of the memory is not tracked in the dynptr, but it would be trivial to add this support inside dynptr state of the register. With these changes and renaming PTR_TO_DYNPTR to CONST_PTR_TO_DYNPTR to better reflect its usage, it can no longer be passed to helpers that initialize a dynptr, i.e. bpf_dynptr_from_mem, bpf_ringbuf_reserve_dynptr. A note to reviewers is that in code that does mark_stack_slots_dynptr, and unmark_stack_slots_dynptr, we implicitly rely on the fact that PTR_TO_STACK reg is the only case that can reach that code path, as one cannot pass CONST_PTR_TO_DYNPTR to helpers that don't set MEM_RDONLY. In both cases such helpers won't be setting that flag. The next patch will add a couple of selftest cases to make sure this doesn't break. Fixes: 2057156738 ("bpf: Add bpf_user_ringbuf_drain() helper") Acked-by: Joanne Koong <joannelkoong@gmail.com> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20221207204141.308952-4-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2022-12-08 18:25:31 -08:00
..
atomic	kbuild: check sha1sum just once for each atomic header	2022-09-29 04:40:14 +09:00
basic	randstruct: Move seed generation into scripts/basic/	2022-05-08 01:33:07 -07:00
clang-tools	scripts/clang-tools: Convert clang-tidy args to list	2022-10-14 22:32:52 +09:00
coccinelle	update Coccinelle URL	2022-08-07 21:30:36 +02:00
dtc	dt: Add a check for undocumented compatible strings in kernel	2022-09-27 10:36:16 -05:00
dummy-tools	kbuild: dummy-tools: pretend we understand __LONG_DOUBLE_128__	2022-08-21 02:47:48 +09:00
gcc-plugins	treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_385.RULE	2022-06-10 14:51:36 +02:00
gdb	Updates to various subsystems which I help look after. lib, ocfs2,	2022-08-07 10:03:24 -07:00
genksyms	genksyms: adjust the output format to modpost	2022-05-24 16:33:20 +09:00
kconfig	kconfig: fix segmentation fault in menuconfig search	2022-11-02 17:32:05 +09:00
ksymoops	…
mod	modpost: fix module versioning when a symbol lacks valid CRC	2022-08-21 02:47:36 +09:00
package	kbuild: Restore .version auto-increment behaviour for Debian packages	2022-11-17 17:51:45 +09:00
selinux	selinux: remove runtime disable message in the install_policy.sh script	2022-09-20 14:12:25 -04:00
tracing	scripts/tracing: Fix typo 'the the' in comment	2022-08-02 15:17:00 -04:00
.gitignore	scripts: add `generate_rust_target.rs`	2022-09-28 09:02:06 +02:00
Kbuild.include	kbuild: remove the target in signal traps when interrupted	2022-09-29 02:00:29 +09:00
Kconfig.include	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
Lindent	…
Makefile	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
Makefile.asm-generic	kbuild: prefix $(srctree)/ to some included Makefiles	2021-03-15 19:20:48 +09:00
Makefile.build	kbuild: add -fno-discard-value-names to cmd_cc_ll_c	2022-10-15 05:22:29 +09:00
Makefile.clang	um: Allow builds with Clang	2022-03-21 08:13:03 -07:00
Makefile.clean	kbuild: drop $(objtree)/ prefix support for clean-files	2022-05-08 03:17:00 +09:00
Makefile.compiler	Makefile.compiler: replace cc-ifversion with compiler-specific macros	2022-09-29 04:40:16 +09:00
Makefile.debug	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
Makefile.dtbinst	kbuild: prefix $(srctree)/ to some included Makefiles	2021-03-15 19:20:48 +09:00
Makefile.extrawarn	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Makefile.gcc-plugins	gcc-plugins: Undefine LATENT_ENTROPY_PLUGIN when plugin disabled for a file	2022-08-16 12:25:53 -07:00
Makefile.headersinst	kbuild: prefix $(srctree)/ to some included Makefiles	2021-03-15 19:20:48 +09:00
Makefile.host	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
Makefile.kasan	kasan: always respect CONFIG_KASAN_STACK	2021-09-24 16:13:35 -07:00
Makefile.kcov	…
Makefile.kcsan	kcsan: Ignore GCC 11+ warnings about TSan runtime support	2021-12-09 16:42:27 -08:00
Makefile.kmsan	kmsan: add KMSAN runtime core	2022-10-03 14:03:19 -07:00
Makefile.lib	- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in	2022-10-10 17:53:04 -07:00
Makefile.modfinal	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Makefile.modinst	kbuild: error out if $(INSTALL_MOD_PATH) contains % or :	2022-07-27 21:18:00 +09:00
Makefile.modpost	kbuild: fix typo in modpost	2022-10-28 00:19:40 +09:00
Makefile.package	scripts: add rust in scripts/Makefile.package	2022-11-24 09:27:57 +09:00
Makefile.randstruct	randstruct: Enable Clang support	2022-05-08 01:33:07 -07:00
Makefile.ubsan	ubsan: remove CONFIG_UBSAN_OBJECT_SIZE	2022-01-20 08:52:55 +02:00
Makefile.userprogs	…
Makefile.vmlinux	kbuild: rebuild .vmlinux.export.o when its prerequisite is updated	2022-10-03 03:52:58 +09:00
Makefile.vmlinux_o	kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_o	2022-10-03 03:52:58 +09:00
adjust_autoksyms.sh	kbuild: split the second line of *.mod into *.usyms	2022-05-08 03:16:59 +09:00
as-version.sh	kbuild: Switch to 'f' variants of integrated assembler flag	2021-09-03 08:17:20 +09:00
asn1_compiler.c	scripts: remove unused argument 'type'	2022-09-29 04:40:16 +09:00
bin2c.c	…
bloat-o-meter	scripts/bloat-o-meter: add -p argument	2022-07-17 17:31:40 -07:00
bootgraph.pl	…
bpf_doc.py	bpf: Rework process_dynptr_func	2022-12-08 18:25:31 -08:00
cc-can-link.sh	…
cc-version.sh	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
check-local-export	kbuild: rewrite check-local-export in sh/awk	2022-09-29 04:40:15 +09:00
check-sysctl-docs	…
check_extable.sh	scripts: check_extable: fix typo in user error message	2021-09-08 11:50:28 -07:00
checkdeclares.pl	scripts: make some scripts executable	2021-08-10 09:13:25 +09:00
checkincludes.pl	…
checkkconfigsymbols.py	checkkconfigsymbols.py: Remove skipping of help lines in parse_kconfig_file	2021-09-19 10:13:03 +09:00
checkpatch.pl	- hfs and hfsplus kmap API modernization from Fabio Francesco	2022-10-12 11:00:22 -07:00
checkstack.pl	checkstack: add riscv support for scripts/checkstack.pl	2022-07-27 21:18:00 +09:00
checksyscalls.sh	checksyscalls: ignore -Wunused-macros	2022-05-08 03:16:59 +09:00
checkversion.pl	scripts: checkversion: modernize linux/version.h search strings	2021-08-05 20:55:39 +09:00
cleanfile	…
cleanpatch	…
coccicheck	scripts: coccicheck: fix troubles on non-English builds	2021-05-18 11:09:59 +02:00
config	kconfig: config script: add a little user help	2021-01-04 10:38:11 +09:00
const_structs.checkpatch	const_structs.checkpatch: add frequently used ops structs	2022-01-20 08:52:54 +02:00
decode_stacktrace.sh	scripts: decode_stacktrace: demangle Rust symbols	2022-09-28 09:01:40 +02:00
decodecode	scripts/decodecode: improve faulting line determination	2022-09-11 21:55:05 -07:00
depmod.sh	depmod: handle the case of /sbin/depmod without /sbin in PATH	2021-01-01 12:26:39 -08:00
dev-needs.sh	…
diffconfig	scripts: switch explicitly to Python 3	2021-01-22 06:34:44 +09:00
documentation-file-ref-check	scripts: documentation-file-ref-check: fix bpf selftests path	2021-10-26 09:42:29 -06:00
export_report.pl	…
extract-ikconfig	scripts/extract-ikconfig: add zstd compression support	2022-08-29 13:58:47 +09:00
extract-module-sig.pl	…
extract-sys-certs.pl	…
extract-vmlinux	…
extract_xc3028.pl	…
faddr2line	scripts/faddr2line: Fix regression in name resolution on ppc64le	2022-11-16 10:42:10 +01:00
file-size.sh	…
find-unused-docs.sh	…
gcc-x86_32-has-stack-protector.sh	x86/stackprotector/32: Make the canary into a regular percpu variable	2021-03-08 13:19:05 +01:00
gcc-x86_64-has-stack-protector.sh	…
gen-randstruct-seed.sh	randstruct: Move seed generation into scripts/basic/	2022-05-08 01:33:07 -07:00
gen_autoksyms.sh	kbuild: Ignore __this_module in gen_autoksyms.sh	2022-06-26 06:15:05 +09:00
gen_ksymdeps.sh	kbuild: redo fake deps at include/ksym/*.h	2021-09-03 08:17:21 +09:00
generate_initcall_order.pl	init: lto: ensure initcall ordering	2021-01-14 08:21:09 -08:00
generate_rust_analyzer.py	scripts: add `generate_rust_analyzer.py`	2022-09-28 09:02:06 +02:00
generate_rust_target.rs	x86: enable initial Rust support	2022-09-28 09:02:45 +02:00
get_abi.pl	scripts/get_abi: Fix wrong script file name in the help message	2022-04-24 10:38:44 +02:00
get_dvb_firmware	…
get_feat.pl	scripts: get_feat.pl: use /usr/bin/env to find perl	2022-06-30 12:22:17 -06:00
get_maintainer.pl	get_maintainer: Honor mailmap for in file emails	2022-04-29 14:38:00 -07:00
gfp-translate	…
head-object-list.txt	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
headerdep.pl	…
headers_install.sh	scripts: headers_install.sh: Update config leak ignore entries	2022-07-27 21:18:00 +09:00
insert-sys-cert.c	…
install.sh	kbuild: factor out the common installation code into scripts/install.sh	2022-05-11 21:45:53 +09:00
is_rust_module.sh	scripts: add `is_rust_module.sh`	2022-09-28 09:02:06 +02:00
jobserver-exec	scripts/jobserver-exec: Fix a typo ("envirnoment")	2021-05-17 12:10:03 +09:00
kallsyms.c	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
kernel-doc	scripts: kernel-doc: Always increment warnings counter	2022-06-13 11:07:45 -06:00
ld-version.sh	kbuild: collect minimum tool versions into scripts/min-tool-version.sh	2021-04-25 05:14:26 +09:00
leaking_addresses.pl	leaking_addresses: Always print a trailing newline	2021-10-15 11:25:13 +02:00
link-vmlinux.sh	kbuild: rebuild .vmlinux.export.o when its prerequisite is updated	2022-10-03 03:52:58 +09:00
makelst	…
markup_oops.pl	…
min-tool-version.sh	scripts/min-tool-version.sh: raise minimum clang version to 15.0.0 for s390	2022-11-09 18:41:16 +01:00
mkcompile_h	Revert "kbuild: Make scripts/compile.h when sh != bash"	2022-09-29 04:40:15 +09:00
mksysmap	kallsyms: ignore __kstrtab_* and __kstrtabns_* symbols	2022-10-03 03:51:58 +09:00
mkuboot.sh	…
module.lds.S	cfi: Switch to -fsanitize=kcfi	2022-09-26 10:13:13 -07:00
modules-check.sh	kbuild: check module name conflict for external modules as well	2021-04-25 05:22:42 +09:00
nsdeps	scripts/nsdeps: adjust to the format change of *.mod files	2022-06-08 20:14:13 +09:00
objdiff	kbuild: clean .tmp_* pattern by make clean	2022-06-05 06:20:57 +09:00
objdump-func	scripts: Create objdump-func helper script	2022-05-12 10:08:43 -07:00
pahole-flags.sh	scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading.	2022-02-22 14:32:44 -08:00
pahole-version.sh	kbuild: Add CONFIG_PAHOLE_VERSION	2022-02-02 11:19:33 +01:00
parse-maintainers.pl	…
patch-kernel	…
profile2linkerlist.pl	…
prune-kernel	scripts/prune-kernel: Use kernel-install if available	2022-05-11 21:46:38 +09:00
recordmcount.c	ftrace: Have recordmcount use w8 to read relp->r_info in arm64_is_fake_mcount	2021-03-02 17:27:18 -05:00
recordmcount.h	recordmcount: Correct st_shndx handling	2021-06-18 09:09:17 -04:00
recordmcount.pl	nds32: Remove the architecture	2022-03-07 13:54:59 +01:00
remove-stale-files	RISC-V Patches for the 5.20 Merge Window, Part 2	2022-08-12 18:39:43 -07:00
rust_is_available.sh	scripts: add `rust_is_available.sh`	2022-09-28 09:02:06 +02:00
rust_is_available_bindgen_libclang.h	scripts: add `rust_is_available.sh`	2022-09-28 09:02:06 +02:00
setlocalversion	kbuild: do not quote string values in include/config/auto.conf	2022-01-08 18:03:57 +09:00
show_delta	…
sign-file.c	sign-file: Fix confusing error messages	2022-08-03 23:56:20 +03:00
sorttable.c	LoongArch: Add ELF-related definitions	2022-06-03 20:09:27 +08:00
sorttable.h	script/sorttable: Fix some initialization problems	2022-01-18 10:17:18 -05:00
spdxcheck-test.sh	docs: move Linux logo into a new `images` folder	2022-06-01 09:32:45 -06:00
spdxcheck.py	scripts/spdxcheck: Put excluded files and directories into a separate file	2022-05-18 15:34:33 +02:00
spdxexclude	scripts/spdxcheck: Exclude top-level README	2022-05-18 15:35:42 +02:00
spelling.txt	scripts/spelling.txt: add more spellings to spelling.txt	2022-03-22 15:57:00 -07:00
sphinx-pre-install	scripts: sphinx-pre-install: place a warning for Sphinx >= 3.0	2022-07-07 12:47:34 -06:00
split-man.pl	…
stackdelta	…
stackusage	…
subarch.include	LoongArch: Add build infrastructure	2022-06-03 20:09:27 +08:00
syscallhdr.sh	scripts: check duplicated syscall number in syscall table	2021-07-09 04:00:39 +09:00
syscallnr.sh	scripts: make some scripts executable	2021-08-10 09:13:25 +09:00
syscalltbl.sh	scripts: check duplicated syscall number in syscall table	2021-07-09 04:00:39 +09:00
tags.sh	scripts/tags.sh: Include tools directory in tags generation	2022-07-01 10:32:30 +02:00
test_fortify.sh	fortify: Update compile-time tests for Clang 14	2022-02-13 16:50:06 -08:00
tools-support-relr.sh	Makefile: fix GDB warning with CONFIG_RELR	2021-06-08 13:09:34 +01:00
unifdef.c	…
ver_linux	Removed the oprofiled version option	2021-05-03 17:23:06 -06:00
xen-hypercalls.sh	scripts: make some scripts executable	2021-08-10 09:13:25 +09:00
xz_wrap.sh	…