From: Richard Earnshaw <Richard.Earnshaw@foss.arm.com>
To: Florian Weimer <fweimer@redhat.com>,
Richard Earnshaw via Libc-alpha <libc-alpha@sourceware.org>
Cc: Richard Earnshaw <rearnsha@arm.com>
Subject: Re: [PATCH v3 3/8] malloc: Basic support for memory tagging in the malloc() family
Date: Wed, 25 Nov 2020 17:32:05 +0000 [thread overview]
Message-ID: <ddf2d04f-3f1f-772f-d25a-5b700c9bf3ab@foss.arm.com> (raw)
In-Reply-To: <87y2ipqy98.fsf@oldenburg2.str.redhat.com>
On 25/11/2020 14:58, Florian Weimer via Libc-alpha wrote:
> * Richard Earnshaw via Libc-alpha:
>
>> +/* Set the tags for a region of memory, which must have size and alignment
>> + that are multiples of __MTAG_GRANULE_SIZE. Size cannot be zero.
>> + void *__libc_mtag_tag_region (const void *, size_t) */
>> +#define __libc_mtag_tag_region(p, s) (p)
>
> I think we need a description of how the tagging operation is supposed
> to work. For example, it's surprising that the requested tag is not
> specified in an argument.
>
> Thanks,
> Florian
>
The (new) tag is already encoded in the pointer. It's (obviously)
implementation specific how that is done. I'll clarify the comment.
R.
next prev parent reply other threads:[~2020-11-25 17:32 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-23 15:42 [PATCH v3 0/8] Memory tagging support Richard Earnshaw
2020-11-23 15:42 ` [PATCH v3 1/8] config: Allow memory tagging to be enabled when configuring glibc Richard Earnshaw
2020-11-25 15:05 ` Siddhesh Poyarekar
2020-11-25 15:09 ` Richard Earnshaw (lists)
2020-11-25 15:10 ` Siddhesh Poyarekar
2020-11-25 15:12 ` Adhemerval Zanella
2020-11-25 16:11 ` Richard Earnshaw (lists)
2020-11-25 16:40 ` Adhemerval Zanella
2020-11-23 15:42 ` [PATCH v3 2/8] elf: Add a tunable to control use of tagged memory Richard Earnshaw
2020-11-25 15:08 ` Siddhesh Poyarekar
2020-11-25 16:35 ` H.J. Lu
2020-11-25 16:53 ` Siddhesh Poyarekar
2020-11-25 16:58 ` Richard Earnshaw
2020-11-25 17:12 ` Siddhesh Poyarekar
2020-11-25 17:24 ` Richard Earnshaw
2020-11-25 17:48 ` Siddhesh Poyarekar
2020-11-25 19:06 ` H.J. Lu
2020-11-26 0:47 ` Siddhesh Poyarekar
2020-11-26 14:15 ` Richard Earnshaw
2020-11-26 15:27 ` Siddhesh Poyarekar
2020-11-26 15:48 ` Richard Earnshaw
2020-11-26 15:50 ` H.J. Lu
2020-11-26 16:28 ` Richard Earnshaw
2020-11-26 16:51 ` H.J. Lu
2020-11-26 16:59 ` Richard Earnshaw
2020-11-26 17:06 ` H.J. Lu
2020-11-26 17:20 ` Szabolcs Nagy
2020-11-26 17:31 ` H.J. Lu
2020-11-26 17:56 ` Richard Earnshaw
2020-11-26 18:06 ` H.J. Lu
2020-11-26 18:06 ` Szabolcs Nagy
2020-11-26 18:09 ` H.J. Lu
2020-11-26 18:25 ` Andreas Schwab
2020-11-27 10:34 ` Szabolcs Nagy
2020-11-27 11:08 ` Florian Weimer
2020-11-27 2:59 ` Siddhesh Poyarekar
2020-11-27 10:32 ` Szabolcs Nagy
2020-11-27 11:14 ` Siddhesh Poyarekar
2020-11-26 16:04 ` Siddhesh Poyarekar
2020-11-26 16:19 ` H.J. Lu
2020-11-26 17:13 ` Siddhesh Poyarekar
2020-11-26 17:19 ` H.J. Lu
2020-11-27 2:45 ` Siddhesh Poyarekar
2020-11-27 10:40 ` Richard Earnshaw
2020-11-27 10:49 ` Richard Earnshaw
2020-11-27 11:32 ` Siddhesh Poyarekar
2020-11-27 11:51 ` Richard Earnshaw
2020-11-27 11:27 ` Siddhesh Poyarekar
2020-11-27 12:24 ` Richard Earnshaw
2020-11-27 14:54 ` H.J. Lu
2020-11-27 17:02 ` Szabolcs Nagy
2020-11-27 18:41 ` H.J. Lu
2020-11-27 14:52 ` H.J. Lu
2020-11-27 16:08 ` Richard Earnshaw
2020-11-27 18:37 ` H.J. Lu
2020-11-30 6:28 ` Siddhesh Poyarekar
2020-11-26 16:10 ` Szabolcs Nagy
2020-11-23 15:42 ` [PATCH v3 3/8] malloc: Basic support for memory tagging in the malloc() family Richard Earnshaw
2020-11-25 14:58 ` Florian Weimer
2020-11-25 17:32 ` Richard Earnshaw [this message]
2020-11-23 15:42 ` [PATCH v3 4/8] malloc: Clean up commentary Richard Earnshaw
2020-11-23 15:42 ` [PATCH v3 5/8] malloc: support MALLOC_CHECK_ in conjunction with _MTAG_ENABLE Richard Earnshaw
2020-11-23 15:42 ` [PATCH v3 6/8] linux: Add compatibility definitions to sys/prctl.h for MTE Richard Earnshaw
2020-11-25 15:26 ` Siddhesh Poyarekar
2020-11-23 15:42 ` [PATCH v3 7/8] aarch64: Add sysv specific enabling code for memory tagging Richard Earnshaw
2020-11-23 16:53 ` Szabolcs Nagy
2020-11-23 17:33 ` Richard Earnshaw (lists)
2020-11-25 15:34 ` Siddhesh Poyarekar
2020-11-25 16:06 ` Richard Earnshaw
2020-11-25 16:20 ` Siddhesh Poyarekar
2020-11-25 16:23 ` Siddhesh Poyarekar
2020-11-23 15:42 ` [PATCH v3 8/8] aarch64: Add aarch64-specific files for memory tagging support Richard Earnshaw
2020-12-16 15:26 ` Szabolcs Nagy
2020-11-24 10:12 ` [PATCH v3 0/8] Memory " Szabolcs Nagy
2020-11-25 14:49 ` Siddhesh Poyarekar
2020-11-25 15:48 ` Richard Earnshaw
2020-11-25 16:17 ` Siddhesh Poyarekar
2020-11-25 15:45 ` H.J. Lu
2020-12-17 3:57 ` DJ Delorie
2020-12-17 11:31 ` Richard Earnshaw
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