Hi Avinesh,
On 2023-08-28 15:28, Avinesh Kumar wrote:
>> Was this text accidentally lost in some patch, or was it never added?
>> If it was there once, please add a "Fixes: ..." tag for it.
> I am not sure if it was ever there.
It was never there, it seems.
$ git show 090fdddb43 -- man2/mmap.2
commit 090fdddb4342f92a1dbeba687462f4bcee816232
Author: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Date: Mon May 17 15:31:08 2021 +1200
memfd_create.2, mmap.2, shmget.2: Document the EPERM for huge page allocations
This error can occur if the caller is does not have CAP_IPC_LOCK
and is not a member of the sysctl_hugetlb_shm_group.
Reported-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxx>
Signed-off-by: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
diff --git a/man2/mmap.2 b/man2/mmap.2
index 03f2eeb2c..4ee2f4f96 100644
--- a/man2/mmap.2
+++ b/man2/mmap.2
@@ -628,6 +628,18 @@ .SH ERRORS
The operation was prevented by a file seal; see
.BR fcntl (2).
.TP
+.B EPERM
+The
+.B MAP_HUGETLB
+flag was specified, but the caller was not privileged (did not have the
+.B CAP_IPC_LOCK
+capability)
+and is not a member of the
+.I sysctl_hugetlb_shm_group
+group; see the description of
+.I /proc/sys/vm/sysctl_hugetlb_shm_group
+in
+.TP
.B ETXTBSY
.B MAP_DENYWRITE
was set but the object specified by
>>
>> Also, proc(5) was recently cut into little sashimi pieces. You want
>> to refer to proc_sys(5).
> Ah.. Thanks for pointing this out, I just checked that thread. I'll send the
> updated patch if you are fine with no "Fixes:" tag for this.
Please add a Fixes mentioning that commit above.
Cheers,
Alex
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