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List: glibc-cvs
Subject: [glibc] hurd: Fix FS_RETRY_MAGICAL "machtype" handling
From: Samuel Thibault via Glibc-cvs <glibc-cvs () sourceware ! org>
Date: 2023-04-29 15:01:16
Message-ID: 20230429150116.990BE3858C50 () sourceware ! org
[Download RAW message or body]
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f56ad6174c62aa38f7edf68167d620482b776dc9
commit f56ad6174c62aa38f7edf68167d620482b776dc9
Author: Sergey Bugaev <bugaevc@gmail.com>
Date: Sat Apr 29 16:13:54 2023 +0300
hurd: Fix FS_RETRY_MAGICAL "machtype" handling
We need to set file_name, not update retryname. This is what the other
branches do.
Before this change, any attempt to access such a file would segfault due
to file_name being unset:
$ settrans -ac /tmp/my-machtype /hurd/magic machtype
$ cat /tmp/my-machtype
Segmentation fault
Checked on i686-gnu.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230429131354.2507443-7-bugaevc@gmail.com>
Diff:
---
hurd/lookup-retry.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/hurd/lookup-retry.c b/hurd/lookup-retry.c
index 99c981046f..62f94bbc92 100644
--- a/hurd/lookup-retry.c
+++ b/hurd/lookup-retry.c
@@ -277,7 +277,6 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
error_t err;
struct host_basic_info hostinfo;
mach_msg_type_number_t hostinfocnt = HOST_BASIC_INFO_COUNT;
- char *p;
/* XXX want client's host */
if (err = __host_info (__mach_host_self (), HOST_BASIC_INFO,
(integer_t *) &hostinfo,
@@ -288,13 +287,11 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
err = EGRATUITOUS;
goto out;
}
- p = _itoa (hostinfo.cpu_subtype, &retryname[8], 10, 0);
- *--p = '/';
- p = _itoa (hostinfo.cpu_type, &retryname[8], 10, 0);
- if (p < retryname)
+ file_name = _itoa (hostinfo.cpu_subtype, &retryname[8], 10, 0);
+ *--file_name = '/';
+ file_name = _itoa (hostinfo.cpu_type, file_name, 10, 0);
+ if (file_name < retryname)
abort (); /* XXX write this right if this ever happens */
- if (p > retryname)
- memmove (retryname, p, strlen(p) + 1);
startdir = *result;
}
else
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