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From 4fa8ae49aa169fb8d97882938e8bee3ed9ce5410 Mon Sep 17 00:00:00 2001
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From: DJ Delorie <dj@delorie.com>
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Date: Fri, 14 Jul 2017 21:46:42 -0400
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Subject: [PATCH] Fix BZ #21654 - grp-merge.c alignment
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* grp/grp_merge.c (__copy_grp): Align char** to minimum pointer
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alignment not char alignment.
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(__merge_grp): Likewise.
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---
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ChangeLog | 7 +++++++
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grp/grp-merge.c | 16 ++++++++++++++++
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2 files changed, 23 insertions(+)
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diff --git a/grp/grp-merge.c b/grp/grp-merge.c
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index 77c494d..6590e5d 100644
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--- a/grp/grp-merge.c
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+++ b/grp/grp-merge.c
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@@ -85,6 +85,14 @@ __copy_grp (const struct group srcgrp, const size_t buflen,
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}
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members[i] = NULL;
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+ /* Align for pointers. We can't simply align C because we need to
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+ align destbuf[c]. */
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+ if ((((uintptr_t)destbuf + c) & (__alignof__(char **) - 1)) != 0)
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+ {
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+ uintptr_t mis_align = ((uintptr_t)destbuf + c) & (__alignof__(char **) - 1);
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+ c += __alignof__(char **) - mis_align;
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+ }
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+
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/* Copy the pointers from the members array into the buffer and assign them
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to the gr_mem member of destgrp. */
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destgrp->gr_mem = (char **) &destbuf[c];
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@@ -168,6 +176,14 @@ __merge_grp (struct group *savedgrp, char *savedbuf, char *savedend,
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/* Add the NULL-terminator. */
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members[savedmemcount + memcount] = NULL;
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+ /* Align for pointers. We can't simply align C because we need to
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+ align savedbuf[c]. */
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+ if ((((uintptr_t)savedbuf + c) & (__alignof__(char **) - 1)) != 0)
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+ {
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+ uintptr_t mis_align = ((uintptr_t)savedbuf + c) & (__alignof__(char **) - 1);
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+ c += __alignof__(char **) - mis_align;
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+ }
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+
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/* Copy the member array back into the buffer after the member list and free
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the member array. */
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savedgrp->gr_mem = (char **) &savedbuf[c];
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--
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1.8.3.1
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