* [PATCH] mmap.2: mmap with address NULL and MAP_FIXED results in EPERM
@ 2017-06-15 19:09 Theodore Dubois
2017-06-16 15:25 ` Michal Hocko
0 siblings, 1 reply; 2+ messages in thread
From: Theodore Dubois @ 2017-06-15 19:09 UTC (permalink / raw)
To: mtk.manpages; +Cc: linux-man, linux-kernel, Theodore Dubois
This can be verified with a simple test program. I'm not sure if this is
a kernel bug or a documentation bug, though...
---
man2/mmap.2 | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/man2/mmap.2 b/man2/mmap.2
index d1942b52a..58361c837 100644
--- a/man2/mmap.2
+++ b/man2/mmap.2
@@ -515,6 +515,13 @@ was mounted no-exec.
.\" (Since 2.4.25 / 2.6.0.)
.TP
.B EPERM
+The
+.I addr
+argument is 0 and
+.B MAP_FIXED
+is specified.
+.TP
+.B EPERM
The operation was prevented by a file seal; see
.BR fcntl (2).
.TP
--
2.13.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] mmap.2: mmap with address NULL and MAP_FIXED results in EPERM
2017-06-15 19:09 [PATCH] mmap.2: mmap with address NULL and MAP_FIXED results in EPERM Theodore Dubois
@ 2017-06-16 15:25 ` Michal Hocko
0 siblings, 0 replies; 2+ messages in thread
From: Michal Hocko @ 2017-06-16 15:25 UTC (permalink / raw)
To: Theodore Dubois; +Cc: mtk.manpages, linux-man, linux-kernel
On Thu 15-06-17 12:09:01, Theodore Dubois wrote:
> This can be verified with a simple test program. I'm not sure if this is
> a kernel bug or a documentation bug, though...
THis is not a bug. You are not allowed to mmap anything below
/proc/sys/vm/mmap_min_addr. So your patch to update documentation would
have to mention this sysctl to be correct.
> ---
> man2/mmap.2 | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/man2/mmap.2 b/man2/mmap.2
> index d1942b52a..58361c837 100644
> --- a/man2/mmap.2
> +++ b/man2/mmap.2
> @@ -515,6 +515,13 @@ was mounted no-exec.
> .\" (Since 2.4.25 / 2.6.0.)
> .TP
> .B EPERM
> +The
> +.I addr
> +argument is 0 and
> +.B MAP_FIXED
> +is specified.
> +.TP
> +.B EPERM
> The operation was prevented by a file seal; see
> .BR fcntl (2).
> .TP
> --
> 2.13.1
--
Michal Hocko
SUSE Labs
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