All of lore.kernel.org
 help / color / mirror / Atom feed
From: Christoph Hellwig <hch@lst.de>
To: Nick Hu <nickhu@andestech.com>, Greentime Hu <green.hu@gmail.com>,
	Vincent Chen <deanbo422@gmail.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-arch@vger.kernel.org, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 0/6] arm: don't call addr_limit_user_check for nommu
Date: Mon, 20 Jul 2020 17:54:41 +0200	[thread overview]
Message-ID: <20200720155441.GA13067@lst.de> (raw)
In-Reply-To: <20200714105505.935079-1-hch@lst.de>

On arm nommu kernel use the same constant for USER_DS and KERNEL_DS,
and seqment_eq always returns false.  With the current check in
addr_limit_user_check that works by accident, but when replacing
seqment_eq with uaccess_kerne it will fail.  Just remove the not
needed check entirely.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Guenter Roeck <linux@roeck-us.net>
---

Andrew: this should preferably go before the other patches in this
series.

 arch/arm/kernel/signal.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index ab2568996ddb0c..c9dc912b83f012 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -713,7 +713,9 @@ struct page *get_signal_page(void)
 /* Defer to generic check */
 asmlinkage void addr_limit_check_failed(void)
 {
+#ifdef CONFIG_MMU
 	addr_limit_user_check();
+#endif
 }
 
 #ifdef CONFIG_DEBUG_RSEQ
-- 
2.27.0


WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Nick Hu <nickhu@andestech.com>, Greentime Hu <green.hu@gmail.com>,
	Vincent Chen <deanbo422@gmail.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-arch@vger.kernel.org, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 0/6] arm: don't call addr_limit_user_check for nommu
Date: Mon, 20 Jul 2020 17:54:41 +0200	[thread overview]
Message-ID: <20200720155441.GA13067@lst.de> (raw)
In-Reply-To: <20200714105505.935079-1-hch@lst.de>

On arm nommu kernel use the same constant for USER_DS and KERNEL_DS,
and seqment_eq always returns false.  With the current check in
addr_limit_user_check that works by accident, but when replacing
seqment_eq with uaccess_kerne it will fail.  Just remove the not
needed check entirely.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Guenter Roeck <linux@roeck-us.net>
---

Andrew: this should preferably go before the other patches in this
series.

 arch/arm/kernel/signal.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index ab2568996ddb0c..c9dc912b83f012 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -713,7 +713,9 @@ struct page *get_signal_page(void)
 /* Defer to generic check */
 asmlinkage void addr_limit_check_failed(void)
 {
+#ifdef CONFIG_MMU
 	addr_limit_user_check();
+#endif
 }
 
 #ifdef CONFIG_DEBUG_RSEQ
-- 
2.27.0


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

  parent reply	other threads:[~2020-07-20 15:54 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14 10:54 clean up address limit helpers v2 Christoph Hellwig
2020-07-14 10:54 ` Christoph Hellwig
2020-07-14 10:55 ` [PATCH 1/6] syscalls: use uaccess_kernel in addr_limit_user_check Christoph Hellwig
2020-07-14 10:55   ` Christoph Hellwig
2020-07-18  1:38   ` Guenter Roeck
2020-07-18  1:38     ` Guenter Roeck
2020-07-18  9:48     ` Christoph Hellwig
2020-07-18  9:48       ` Christoph Hellwig
2020-07-18 14:54       ` Guenter Roeck
2020-07-18 14:54         ` Guenter Roeck
2020-07-20 10:01         ` Christoph Hellwig
2020-07-20 10:01           ` Christoph Hellwig
2020-07-20 14:55           ` Guenter Roeck
2020-07-20 14:55             ` Guenter Roeck
2020-07-20 15:28             ` Peter Maydell
2020-07-20 15:28               ` Peter Maydell
2020-07-20 22:10       ` Guenter Roeck
2020-07-20 22:10         ` Guenter Roeck
2020-07-21  4:58         ` Christoph Hellwig
2020-07-21  4:58           ` Christoph Hellwig
2020-07-21  5:15           ` Guenter Roeck
2020-07-21  5:15             ` Guenter Roeck
2020-07-21  5:20             ` Christoph Hellwig
2020-07-21  5:20               ` Christoph Hellwig
2020-07-21  5:30               ` Guenter Roeck
2020-07-21  5:30                 ` Guenter Roeck
2020-07-21  5:35                 ` Christoph Hellwig
2020-07-21  5:35                   ` Christoph Hellwig
2020-07-14 10:55 ` [PATCH 2/6] nds32: use uaccess_kernel in show_regs Christoph Hellwig
2020-07-14 10:55   ` Christoph Hellwig
2020-07-14 10:55 ` [PATCH 3/6] riscv: include <asm/pgtable.h> in <asm/uaccess.h> Christoph Hellwig
2020-07-14 10:55   ` Christoph Hellwig
2020-07-14 10:55 ` [PATCH 4/6] uaccess: remove segment_eq Christoph Hellwig
2020-07-14 10:55   ` Christoph Hellwig
2020-07-14 15:27   ` Linus Torvalds
2020-07-14 15:27     ` Linus Torvalds
2020-07-14 10:55 ` [PATCH 5/6] uaccess: add force_uaccess_{begin,end} helpers Christoph Hellwig
2020-07-14 10:55   ` Christoph Hellwig
2020-07-14 15:29   ` Linus Torvalds
2020-07-14 15:29     ` Linus Torvalds
2020-07-14 10:55 ` [PATCH 6/6] exec: use force_uaccess_begin during exec and exit Christoph Hellwig
2020-07-14 10:55   ` Christoph Hellwig
2020-07-15  3:33   ` Eric W. Biederman
2020-07-15  3:33     ` Eric W. Biederman
2020-07-15  6:06     ` Christoph Hellwig
2020-07-15  6:06       ` Christoph Hellwig
2020-07-16 23:49 ` clean up address limit helpers v2 Andrew Morton
2020-07-16 23:49   ` Andrew Morton
2020-07-17  6:06   ` Christoph Hellwig
2020-07-17  6:06     ` Christoph Hellwig
2020-07-20 15:54 ` Christoph Hellwig [this message]
2020-07-20 15:54   ` [PATCH 0/6] arm: don't call addr_limit_user_check for nommu Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200720155441.GA13067@lst.de \
    --to=hch@lst.de \
    --cc=akpm@linux-foundation.org \
    --cc=deanbo422@gmail.com \
    --cc=green.hu@gmail.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-riscv@lists.infradead.org \
    --cc=nickhu@andestech.com \
    --cc=palmer@dabbelt.com \
    --cc=paul.walmsley@sifive.com \
    --cc=torvalds@linux-foundation.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.