The patch titled
Subject: prctl: implement PR_GET_ENDIAN for all architectures
has been added to the -mm tree. Its filename is
prctl-implement-pr_get_endian-for-all-architectures.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/prctl-implement-pr_get_endian-for-all-architectures.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/prctl-implement-pr_get_endian-for-all-architectures.patch
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------------------------------------------------------
From: Helge Deller <deller@xxxxxx>
Subject: prctl: implement PR_GET_ENDIAN for all architectures
The prctl(PR_GET_ENDIAN) syscall was added to Kernel 2.6.18, but
implemented for PowerPC only. This trivial patch adds support for this
syscall for all other architectures.
Link: http://lkml.kernel.org/r/20170128111310.GA13389@xxxxxxxxxxxxxxxx
Signed-off-by: Helge Deller <deller@xxxxxx>
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sys.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff -puN kernel/sys.c~prctl-implement-pr_get_endian-for-all-architectures kernel/sys.c
--- a/kernel/sys.c~prctl-implement-pr_get_endian-for-all-architectures
+++ a/kernel/sys.c
@@ -79,9 +79,6 @@
#ifndef GET_FPEXC_CTL
# define GET_FPEXC_CTL(a, b) (-EINVAL)
#endif
-#ifndef GET_ENDIAN
-# define GET_ENDIAN(a, b) (-EINVAL)
-#endif
#ifndef SET_ENDIAN
# define SET_ENDIAN(a, b) (-EINVAL)
#endif
@@ -2136,7 +2133,13 @@ SYSCALL_DEFINE5(prctl, int, option, unsi
return -EFAULT;
break;
case PR_GET_ENDIAN:
+#ifdef GET_ENDIAN
error = GET_ENDIAN(me, arg2);
+#elif defined(__BIG_ENDIAN)
+ error = put_user(PR_ENDIAN_BIG, (unsigned int __user *)arg2);
+#else
+ error = put_user(PR_ENDIAN_LITTLE, (unsigned int __user *)arg2);
+#endif
break;
case PR_SET_ENDIAN:
error = SET_ENDIAN(me, arg2);
_
Patches currently in -mm which might be from deller@xxxxxx are
prctl-implement-pr_get_endian-for-all-architectures.patch
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