From: Alexey Gladkov <legion@kernel.org>
To: LKML <linux-kernel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
viro@zeniv.linux.org.uk
Cc: James.Bottomley@HansenPartnership.com, acme@kernel.org,
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dhowells@redhat.com, fenghua.yu@intel.com, fweimer@redhat.com,
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paulus@samba.org, peterz@infradead.org, ralf@linux-mips.org,
sparclinux@vger.kernel.org, stefan@agner.ch, tglx@linutronix.de,
tony.luck@intel.com, tycho@tycho.ws, will@kernel.org,
x86@kernel.org, ysato@users.sourceforge.jp
Subject: [PATCH v4 0/5] Add a new fchmodat2() syscall
Date: Tue, 11 Jul 2023 18:16:02 +0200 [thread overview]
Message-ID: <cover.1689092120.git.legion@kernel.org> (raw)
In-Reply-To: <cover.1689074739.git.legion@kernel.org>
In glibc, the fchmodat(3) function has a flags argument according to the
POSIX specification [1], but kernel syscalls has no such argument.
Therefore, libc implementations do workarounds using /proc. However,
this requires procfs to be mounted and accessible.
This patch set adds fchmodat2(), a new syscall. The syscall allows to
pass the AT_SYMLINK_NOFOLLOW flag to disable LOOKUP_FOLLOW. In all other
respects, this syscall is no different from fchmodat().
[1] https://pubs.opengroup.org/onlinepubs/9699919799/functions/chmod.html
Changes since v3 [cover.1689074739.git.legion@kernel.org]:
* Rebased to master because a new syscall has appeared in master.
* Increased __NR_compat_syscalls as pointed out by Arnd Bergmann.
* Syscall renamed fchmodat4 -> fchmodat2 as suggested by Christian Brauner.
* Returned do_fchmodat4() the original name. We don't need to version
internal functions.
* Fixed warnings found by checkpatch.pl.
Changes since v2 [20190717012719.5524-1-palmer@sifive.com]:
* Rebased to master.
* The lookup_flags passed to sys_fchmodat4 as suggested by Al Viro.
* Selftest added.
Changes since v1 [20190531191204.4044-1-palmer@sifive.com]:
* All architectures are now supported, which support squashed into a
single patch.
* The do_fchmodat() helper function has been removed, in favor of directly
calling do_fchmodat4().
* The patches are based on 5.2 instead of 5.1.
---
Alexey Gladkov (2):
fs: Add fchmodat2()
selftests: Add fchmodat2 selftest
Palmer Dabbelt (3):
Non-functional cleanup of a "__user * filename"
arch: Register fchmodat2, usually as syscall 452
tools headers UAPI: Sync files changed by new fchmodat2 syscall
arch/alpha/kernel/syscalls/syscall.tbl | 1 +
arch/arm/tools/syscall.tbl | 1 +
arch/arm64/include/asm/unistd.h | 2 +-
arch/arm64/include/asm/unistd32.h | 2 +
arch/ia64/kernel/syscalls/syscall.tbl | 1 +
arch/m68k/kernel/syscalls/syscall.tbl | 1 +
arch/microblaze/kernel/syscalls/syscall.tbl | 1 +
arch/mips/kernel/syscalls/syscall_n32.tbl | 1 +
arch/mips/kernel/syscalls/syscall_n64.tbl | 1 +
arch/mips/kernel/syscalls/syscall_o32.tbl | 1 +
arch/parisc/kernel/syscalls/syscall.tbl | 1 +
arch/powerpc/kernel/syscalls/syscall.tbl | 1 +
arch/s390/kernel/syscalls/syscall.tbl | 1 +
arch/sh/kernel/syscalls/syscall.tbl | 1 +
arch/sparc/kernel/syscalls/syscall.tbl | 1 +
arch/x86/entry/syscalls/syscall_32.tbl | 1 +
arch/x86/entry/syscalls/syscall_64.tbl | 1 +
arch/xtensa/kernel/syscalls/syscall.tbl | 1 +
fs/open.c | 18 +-
include/linux/syscalls.h | 4 +-
include/uapi/asm-generic/unistd.h | 5 +-
tools/include/uapi/asm-generic/unistd.h | 5 +-
.../arch/mips/entry/syscalls/syscall_n64.tbl | 2 +
.../arch/powerpc/entry/syscalls/syscall.tbl | 2 +
.../perf/arch/s390/entry/syscalls/syscall.tbl | 2 +
.../arch/x86/entry/syscalls/syscall_64.tbl | 2 +
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/fchmodat2/.gitignore | 2 +
tools/testing/selftests/fchmodat2/Makefile | 6 +
.../selftests/fchmodat2/fchmodat2_test.c | 162 ++++++++++++++++++
30 files changed, 223 insertions(+), 8 deletions(-)
create mode 100644 tools/testing/selftests/fchmodat2/.gitignore
create mode 100644 tools/testing/selftests/fchmodat2/Makefile
create mode 100644 tools/testing/selftests/fchmodat2/fchmodat2_test.c
--
2.33.8
next prev parent reply other threads:[~2023-07-11 16:17 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190717012719.5524-1-palmer@sifive.com>
2020-06-09 13:52 ` Add a new fchmodat4() syscall, v2 Florian Weimer
2023-07-11 11:25 ` [PATCH v3 0/5] Add a new fchmodat4() syscall Alexey Gladkov
2023-07-11 11:25 ` [PATCH v3 1/5] Non-functional cleanup of a "__user * filename" Alexey Gladkov
2023-07-11 11:32 ` Arnd Bergmann
2023-07-11 11:25 ` [PATCH v3 2/5] fs: Add fchmodat4() Alexey Gladkov
2023-07-11 11:42 ` Arnd Bergmann
2023-07-11 11:52 ` Christian Brauner
2023-07-11 12:51 ` Alexey Gladkov
2023-07-11 14:01 ` Christian Brauner
2023-07-11 15:23 ` Alexey Gladkov
2023-07-11 12:28 ` Matthew Wilcox
2023-07-11 12:49 ` Alexey Gladkov
2023-07-11 11:25 ` [PATCH v3 3/5] arch: Register fchmodat4, usually as syscall 451 Alexey Gladkov
2023-07-11 11:31 ` Arnd Bergmann
2023-07-11 11:25 ` [PATCH v3 4/5] tools headers UAPI: Sync files changed by new fchmodat4 syscall Alexey Gladkov
2023-07-11 11:25 ` [PATCH v3 5/5] selftests: add fchmodat4(2) selftest Alexey Gladkov
2023-07-11 12:10 ` Florian Weimer
2023-07-11 13:38 ` Alexey Gladkov
2023-07-11 12:24 ` [PATCH v3 0/5] Add a new fchmodat4() syscall Florian Weimer
2023-07-11 15:14 ` Christian Brauner
2023-07-25 11:05 ` Alexey Gladkov
2023-07-25 12:05 ` Christian Brauner
2023-07-11 16:16 ` Alexey Gladkov [this message]
2023-07-11 16:16 ` [PATCH v4 1/5] Non-functional cleanup of a "__user * filename" Alexey Gladkov
2023-07-11 16:16 ` [PATCH v4 2/5] fs: Add fchmodat2() Alexey Gladkov
2023-07-11 17:05 ` Christian Brauner
2023-07-25 16:36 ` Aleksa Sarai
2023-07-26 13:45 ` Alexey Gladkov
2023-07-27 10:26 ` Christian Brauner
2023-07-27 17:12 ` Aleksa Sarai
2023-07-27 17:39 ` Aleksa Sarai
2023-07-28 8:43 ` David Laight
2023-07-28 18:42 ` dalias
2023-07-27 9:01 ` David Laight
2023-07-27 16:28 ` Andreas Schwab
2023-07-27 17:02 ` Christian Brauner
2023-07-27 17:13 ` dalias
2023-07-27 17:36 ` Christian Brauner
2023-07-27 16:31 ` dalias
2023-07-11 16:16 ` [PATCH v4 3/5] arch: Register fchmodat2, usually as syscall 452 Alexey Gladkov
2023-07-11 16:26 ` Arnd Bergmann
2023-07-25 7:16 ` Geert Uytterhoeven
2023-07-25 16:43 ` Aleksa Sarai
2023-07-27 10:37 ` Christian Brauner
2023-07-27 17:42 ` Aleksa Sarai
2023-07-11 16:16 ` [PATCH v4 4/5] tools headers UAPI: Sync files changed by new fchmodat2 syscall Alexey Gladkov
2023-07-11 17:19 ` Namhyung Kim
2023-07-11 17:23 ` Alexey Gladkov
2023-07-11 16:16 ` [PATCH v4 5/5] selftests: Add fchmodat2 selftest Alexey Gladkov
2023-07-11 17:36 ` (subset) [PATCH v4 0/5] Add a new fchmodat2() syscall Christian Brauner
2023-07-12 2:42 ` Rich Felker
2023-07-25 15:58 ` Add fchmodat2() - or add a more general syscall? David Howells
2023-07-25 16:10 ` Florian Weimer
2023-07-25 16:50 ` Aleksa Sarai
2023-07-25 18:39 ` David Howells
2023-07-25 18:44 ` Rich Felker
2023-07-26 13:30 ` Christian Brauner
2023-07-27 3:57 ` Eric Biggers
2023-07-27 10:27 ` Christian Brauner
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