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Christian Göttsche 6140be90ec fs/xattr: add *at family syscalls 
Add the four syscalls setxattrat(), getxattrat(), listxattrat() and
removexattrat().  Those can be used to operate on extended attributes,
especially security related ones, either relative to a pinned directory
or on a file descriptor without read access, avoiding a
/proc/<pid>/fd/<fd> detour, requiring a mounted procfs.

One use case will be setfiles(8) setting SELinux file contexts
("security.selinux") without race conditions and without a file
descriptor opened with read access requiring SELinux read permission.

Use the do_{name}at() pattern from fs/open.c.

Pass the value of the extended attribute, its length, and for
setxattrat(2) the command (XATTR_CREATE or XATTR_REPLACE) via an added
struct xattr_args to not exceed six syscall arguments and not
merging the AT_* and XATTR_* flags.

[AV: fixes by Christian Brauner folded in, the entire thing rebased on
top of {filename,file}_...xattr() primitives, treatment of empty
pathnames regularized.  As the result, AT_EMPTY_PATH+NULL handling
is cheap, so f...(2) can use it]

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Link: https://lore.kernel.org/r/20240426162042.191916-1-cgoettsche@seltendoof.de
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
CC: x86@kernel.org
CC: linux-alpha@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: linux-arm-kernel@lists.infradead.org
CC: linux-ia64@vger.kernel.org
CC: linux-m68k@lists.linux-m68k.org
CC: linux-mips@vger.kernel.org
CC: linux-parisc@vger.kernel.org
CC: linuxppc-dev@lists.ozlabs.org
CC: linux-s390@vger.kernel.org
CC: linux-sh@vger.kernel.org
CC: sparclinux@vger.kernel.org
CC: linux-fsdevel@vger.kernel.org
CC: audit@vger.kernel.org
CC: linux-arch@vger.kernel.org
CC: linux-api@vger.kernel.org
CC: linux-security-module@vger.kernel.org
CC: selinux@vger.kernel.org
[brauner: slight tweaks]
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2024-11-06 12:59:44 -05:00
..
syscalls fs/xattr: add *at family syscalls 2024-11-06 12:59:44 -05:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
adi_64.c sparc64: Fix prototype warnings in adi_64.c 2024-04-22 15:33:06 +02:00
apc.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
asm-offsets.c arch: fix asm-offsets.c building with -Wmissing-prototypes 2023-11-23 11:32:31 +01:00
audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
auxio_32.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
auxio_64.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
btext.c sparc: Use shared font data 2024-02-16 16:49:58 +01:00
central.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
cherrs.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
chmc.c sparc: chmc: Convert to platform remove callback returning void 2024-04-22 16:51:57 +02:00
compat_audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
cpu.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
cpumap.c sparc: Annotate struct cpuinfo_tree with __counted_by 2023-10-06 13:25:17 -07:00
cpumap.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
devices.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ds.c Normalise "name (ad@dr)" MODULE_AUTHORs to "name <ad@dr>" 2024-03-06 13:07:39 -08:00
dtlb_miss.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dtlb_prot.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ebus.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
entry.h sparc64: Add support for ADI register fields, ASIs and traps 2018-03-18 07:38:45 -07:00
entry.S sparc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-22 18:12:25 +09:00
etrap_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
etrap_64.S sparc64: Add support for ADI (Application Data Integrity) 2018-03-18 07:38:48 -07:00
fpu_traps.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ftrace.c ftrace: Cleanup ftrace_dyn_arch_init() 2021-10-08 19:41:39 -04:00
getsetcc.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
head_32.S sparc32: Fix truncated relocation errors when linking large kernels 2024-07-11 15:58:18 +02:00
head_64.S sparc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-22 18:12:25 +09:00
helpers.S treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
hvapi.c sparc64: Oracle DAX infrastructure 2018-01-22 08:17:15 -08:00
hvcalls.S sparc64: Oracle DAX infrastructure 2018-01-22 08:17:15 -08:00
hvtramp.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idprom.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
iommu_common.h sparc: remove the mapping_error dma_map_ops method 2018-12-06 06:56:40 -08:00
iommu-common.c dma-mapping: introduce dma_get_seg_boundary_nr_pages() 2020-09-03 18:12:15 +02:00
iommu.c sparc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR 2021-08-09 17:13:06 +02:00
ioport.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
irq_32.c sparc32: Fix build with trapbase 2024-03-08 21:20:23 +01:00
irq_64.c sparc/irq: Remove on-stack cpumask var 2024-05-08 19:42:15 +02:00
irq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
itlb_miss.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ivec.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
jump_label.c jump_label: move 'asm goto' support test to Kconfig 2019-01-06 09:46:51 +09:00
kernel.h sparc64: Fix prototype warning for uprobe_trap 2024-04-22 15:33:06 +02:00
kgdb_32.c sparc32: Fix build with trapbase 2024-03-08 21:20:23 +01:00
kgdb_64.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
kprobes.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
kstack.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ktlb.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
ldc.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
led.c proc: make the proc_create[_data]() stubs static inlines 2022-01-20 08:52:52 +02:00
leon_kernel.c sparc/leon: Remove on-stack cpumask var 2024-05-08 19:42:16 +02:00
leon_pci_grpci1.c sparc32: Fix section mismatch in leon_pci_grpci 2024-03-08 21:21:00 +01:00
leon_pci_grpci2.c sparc32: Fix section mismatch in leon_pci_grpci 2024-03-08 21:21:00 +01:00
leon_pci.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
leon_pmc.c arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabled 2023-01-13 11:48:15 +01:00
leon_smp.c sparc32: Fix build with trapbase 2024-03-08 21:20:23 +01:00
Makefile arch: turn off -Werror for architectures with known warnings 2023-12-10 17:21:33 -08:00
mdesc.c sparc: avoid stringop-overread errors 2021-09-15 13:42:33 -07:00
misctrap.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.c arch: make execmem setup available regardless of CONFIG_MODULES 2024-05-14 00:31:44 -07:00
nmi.c sparc64: NMI watchdog: fix return value of __setup handler 2024-02-16 16:50:25 +01:00
of_device_32.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
of_device_64.c sparc/of: Remove on-stack cpumask var 2024-05-08 19:42:15 +02:00
of_device_common.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
of_device_common.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci_common.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
pci_fire.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
pci_impl.h sparc: Fix typos 2024-02-16 16:50:25 +01:00
pci_msi.c sparc/pci_msi: Remove on-stack cpumask var 2024-05-08 19:42:15 +02:00
pci_psycho.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
pci_sabre.c sparc: Use device_get_match_data() 2024-01-19 08:08:53 -06:00
pci_schizo.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
pci_sun4v_asm.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci_sun4v.c sparc64: Fix prototype warning for dma_4v_iotsb_bind 2024-04-22 15:33:06 +02:00
pci_sun4v.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
pcic.c PCI: Introduce pci_dev_for_each_resource() 2023-04-04 10:43:52 -05:00
pcr.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
perf_event.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
pmc.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
power.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
process_32.c arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabled 2023-01-13 11:48:15 +01:00
process_64.c TTY/Serial driver changes for 6.6-rc1 2023-09-01 09:38:00 -07:00
process.c sparc: switch to kernel_clone() 2020-08-20 13:12:58 +02:00
prom_32.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
prom_64.c sparc64: Fix number of online CPUs 2024-04-22 15:33:07 +02:00
prom_common.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
prom_irqtrans.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
prom.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
psycho_common.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
psycho_common.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ptrace_32.c sparc: ptrace: user_regset_copyin_ignore() always returns 0 2022-11-15 14:30:41 -08:00
ptrace_64.c sparc: ptrace: user_regset_copyin_ignore() always returns 0 2022-11-15 14:30:41 -08:00
reboot.c sparc: Use device_type helpers to access the node type 2018-11-18 13:35:21 -08:00
rtrap_32.S sparc32: Preserve clone syscall flags argument for restarts due to signals 2021-02-18 16:15:11 -08:00
rtrap_64.S context_tracking: Split user tracking Kconfig 2022-06-29 17:04:09 -07:00
sbus.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
setup_32.c sparc32: Fix build with trapbase 2024-03-08 21:20:23 +01:00
setup_64.c sparc64: Fix number of online CPUs 2024-04-22 15:33:07 +02:00
signal32.c x86/shstk: Add user control-protection fault handler 2023-08-02 15:01:50 -07:00
signal_32.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
signal_64.c sparc: Fix typos 2024-02-16 16:50:25 +01:00
sigutil_32.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
sigutil_64.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sigutil.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp_32.c treewide: Trace IPIs sent via smp_send_reschedule() 2023-03-24 11:01:28 +01:00
smp_64.c sparc64: Fix number of online CPUs 2024-04-22 15:33:07 +02:00
sparc_ksyms.c sparc: move exports to definitions 2016-08-07 23:55:43 -04:00
spiterrs.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sstate.c kernel.h: split out panic and oops helpers 2021-07-01 11:06:04 -07:00
stacktrace.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
starfire.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sun4d_irq.c sparc: Use of_node_name_eq for node name comparisons 2018-11-18 13:35:21 -08:00
sun4d_smp.c sparc: Unbreak the build 2022-09-29 19:21:10 -07:00
sun4m_irq.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
sun4m_smp.c sparc: Unbreak the build 2022-09-29 19:21:10 -07:00
sun4v_ivec.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sun4v_mcd.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482 2019-06-19 17:09:52 +02:00
sun4v_tlb_miss.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sys32.S sparc: fix compat recv/recvfrom syscalls 2024-06-25 15:57:25 +02:00
sys_sparc32.c sparc: remove unused header file nfs_fs.h 2020-06-02 18:41:48 -07:00
sys_sparc_32.c mm: make arch_get_unmapped_area() take vm_flags by default 2024-09-09 16:39:13 -07:00
sys_sparc_64.c mm: make arch_get_unmapped_area() take vm_flags by default 2024-09-09 16:39:13 -07:00
syscalls.S sparc64: enable HAVE_COPY_THREAD_TLS 2020-06-23 10:49:54 +02:00
sysfs.c drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 2022-03-22 15:57:10 -07:00
systbls_32.S sparc: syscalls: switch to generic syscalltbl.sh 2021-05-02 00:43:34 +09:00
systbls_64.S sparc: syscalls: switch to generic syscalltbl.sh 2021-05-02 00:43:34 +09:00
systbls.h sparc: get rid of asm wrapper for nis_syscall() 2018-03-20 12:05:17 -04:00
termios.c termios: start unifying non-UAPI parts of asm/termios.h 2022-09-09 10:44:34 +02:00
time_32.c sparc: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
time_64.c sparc64: Fix prototype warning for sched_clock 2024-04-22 15:33:06 +02:00
trampoline_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trampoline_64.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
traps_32.c arch: include linux/cpu.h for trap_init() prototype 2023-11-23 11:32:31 +01:00
traps_64.c sparc64: Fix prototype warnings in traps_64.c 2024-04-22 15:33:06 +02:00
tsb.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ttable_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ttable_64.S sparc64: Add support for ADI register fields, ASIs and traps 2018-03-18 07:38:45 -07:00
una_asm_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
una_asm_64.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
unaligned_32.c signal/sparc: si_trapno is only used with SIGILL ILL_ILLTRP 2021-07-23 13:08:57 -05:00
unaligned_64.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uprobes.c sparc64: Fix prototype warning for uprobe_trap 2024-04-22 15:33:06 +02:00
urtt_fill.S sparc64: Add support for ADI (Application Data Integrity) 2018-03-18 07:38:48 -07:00
utrap.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vdso.c locking/seqlock, headers: Untangle the spaghetti monster 2020-08-06 16:13:13 +02:00
vio.c driver core: have match() callback in struct bus_type take a const * 2024-07-03 15:16:54 +02:00
viohs.c sparc64: viohs: Use struct_size() helper 2020-06-22 15:43:16 -07:00
visemul.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vmlinux.lds.S objtool/idle: Validate __cpuidle code as noinstr 2023-01-13 11:48:15 +01:00
windows.c signal: Replace force_fatal_sig with force_exit_sig when in doubt 2021-11-19 09:15:58 -06:00
winfixup.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wof.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wuf.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00