From: Konstantin Khlebnikov <koct9i@gmail.com> To: Al Viro <viro@zeniv.linux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Heiko Carstens <heiko.carstens@de.ibm.com>, Russell King - ARM Linux <linux@armlinux.org.uk>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Baole Ni <baolex.ni@intel.com>, Pavel Machek <pavel@ucw.cz>, chuansheng.liu@intel.com, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org> Subject: Re: Please don't replace numeric parameter like 0444 with macro Date: Wed, 3 Aug 2016 11:07:28 +0300 [thread overview] Message-ID: <CALYGNiPg9eXYdX209n8wEd03fh4Q45QT4EmUGjrZs+DEz-Jp5A@mail.gmail.com> (raw) In-Reply-To: <20160803004226.GF2356@ZenIV.linux.org.uk> On Wed, Aug 3, 2016 at 3:42 AM, Al Viro <viro@zeniv.linux.org.uk> wrote: > On Tue, Aug 02, 2016 at 04:58:29PM -0400, Linus Torvalds wrote: >> [ So I answered similarly to another patch, but I'll just re-iterate >> and change the subject line so that it stands out a bit from the >> millions of actual patches ] >> >> On Tue, Aug 2, 2016 at 1:42 PM, Pavel Machek <pavel@ucw.cz> wrote: >> > >> > Everyone knows what 0644 is, but noone can read S_IRUSR | S_IWUSR | >> > S_IRCRP | S_IROTH (*). Please don't do this. >> >> Absolutely. It's *much* easier to parse and understand the octal >> numbers, while the symbolic macro names are just random line noise and >> hard as hell to understand. You really have to think about it. >> >> So we should rather go the other way: convert existing bad symbolic >> permission bit macro use to just use the octal numbers. >> >> The symbolic names are good for the *other* bits (ie sticky bit, and >> the inode mode _type_ numbers etc), but for the permission bits, the >> symbolic names are just insane crap. Nobody sane should ever use them. >> Not in the kernel, not in user space. > > Except that you are inviting the mixes like S_IFDIR | 17 /* oops, should've > been 017, or do we spell it 0017? */ that way. I certainly agree that this > patch series had been a huge pile of manure, but "let's convert it in other > direction" is inviting pretty much the same thing, with lovely potential for > typos, etc. We could add several macro with readable names for really used rwx combinations, like: #define KERN_SECRET_RO 0400 #define KERN_SECRET_RW 0600 #define KERN_SECRET_WO 0200 #define KERN_SECRET_DIR 0500 #define KERN_PUBLIC_RO 0444 #define KERN_PUBLIC_RW 0644 #define KERN_PUBLIC_DIR 0555 #define KERN_UNSAFE_RW 0666 #define KERN_UNSAFE_WO 0222 #define KERN_UNSAFE_DIR 0777 > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: koct9i@gmail.com (Konstantin Khlebnikov) To: linux-arm-kernel@lists.infradead.org Subject: Please don't replace numeric parameter like 0444 with macro Date: Wed, 3 Aug 2016 11:07:28 +0300 [thread overview] Message-ID: <CALYGNiPg9eXYdX209n8wEd03fh4Q45QT4EmUGjrZs+DEz-Jp5A@mail.gmail.com> (raw) In-Reply-To: <20160803004226.GF2356@ZenIV.linux.org.uk> On Wed, Aug 3, 2016 at 3:42 AM, Al Viro <viro@zeniv.linux.org.uk> wrote: > On Tue, Aug 02, 2016 at 04:58:29PM -0400, Linus Torvalds wrote: >> [ So I answered similarly to another patch, but I'll just re-iterate >> and change the subject line so that it stands out a bit from the >> millions of actual patches ] >> >> On Tue, Aug 2, 2016 at 1:42 PM, Pavel Machek <pavel@ucw.cz> wrote: >> > >> > Everyone knows what 0644 is, but noone can read S_IRUSR | S_IWUSR | >> > S_IRCRP | S_IROTH (*). Please don't do this. >> >> Absolutely. It's *much* easier to parse and understand the octal >> numbers, while the symbolic macro names are just random line noise and >> hard as hell to understand. You really have to think about it. >> >> So we should rather go the other way: convert existing bad symbolic >> permission bit macro use to just use the octal numbers. >> >> The symbolic names are good for the *other* bits (ie sticky bit, and >> the inode mode _type_ numbers etc), but for the permission bits, the >> symbolic names are just insane crap. Nobody sane should ever use them. >> Not in the kernel, not in user space. > > Except that you are inviting the mixes like S_IFDIR | 17 /* oops, should've > been 017, or do we spell it 0017? */ that way. I certainly agree that this > patch series had been a huge pile of manure, but "let's convert it in other > direction" is inviting pretty much the same thing, with lovely potential for > typos, etc. We could add several macro with readable names for really used rwx combinations, like: #define KERN_SECRET_RO 0400 #define KERN_SECRET_RW 0600 #define KERN_SECRET_WO 0200 #define KERN_SECRET_DIR 0500 #define KERN_PUBLIC_RO 0444 #define KERN_PUBLIC_RW 0644 #define KERN_PUBLIC_DIR 0555 #define KERN_UNSAFE_RW 0666 #define KERN_UNSAFE_WO 0222 #define KERN_UNSAFE_DIR 0777 > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2016-08-03 8:09 UTC|newest] Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-08-02 20:58 Please don't replace numeric parameter like 0444 with macro Linus Torvalds 2016-08-02 20:58 ` Linus Torvalds 2016-08-02 21:53 ` Rob Landley 2016-08-02 21:53 ` Rob Landley 2016-08-02 23:39 ` [PATCH] checkpatch: Look for symbolic permissions and suggest octal instead Joe Perches 2016-08-03 0:15 ` Al Viro 2016-08-03 0:30 ` Joe Perches 2016-08-15 16:38 ` Joe Perches 2016-08-03 0:42 ` Please don't replace numeric parameter like 0444 with macro Al Viro 2016-08-03 0:42 ` Al Viro 2016-08-03 8:07 ` Konstantin Khlebnikov [this message] 2016-08-03 8:07 ` Konstantin Khlebnikov 2016-08-03 8:30 ` Richard Weinberger 2016-08-03 8:30 ` Richard Weinberger 2016-08-03 8:11 ` [PATCH] Add file permission mode helpers Ingo Molnar 2016-08-03 8:11 ` Ingo Molnar 2016-08-03 8:28 ` Greg Kroah-Hartman 2016-08-03 8:28 ` Greg Kroah-Hartman 2016-08-03 8:39 ` Ingo Molnar 2016-08-03 8:39 ` Ingo Molnar 2016-08-03 9:21 ` Willy Tarreau 2016-08-03 9:21 ` Willy Tarreau 2016-08-03 9:53 ` Marcel Holtmann 2016-08-03 9:53 ` Marcel Holtmann 2016-08-03 15:49 ` Joe Perches 2016-08-03 15:49 ` Joe Perches 2016-08-03 16:38 ` Pavel Machek 2016-08-03 16:38 ` Pavel Machek
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