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943807 |
Zseries only: Leave the hardware filedescriptors open.
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943807 |
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943807 |
All filedescriptors above 2 are getting closed when a new
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943807 |
sshd process to handle a new client connection is
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943807 |
spawned. As the process also chroot into an empty filesystem
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943807 |
without any device nodes, there is no chance to reopen the
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943807 |
files. This patch filters out the reqired fds in the
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943807 |
closefrom function so these are skipped in the close loop.
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943807 |
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943807 |
Author: Harald Freudenberger <freude@de.ibm.com>
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943807 |
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943807 |
---
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943807 |
openbsd-compat/bsd-closefrom.c | 26 ++++++++++++++++++++++++++
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943807 |
1 file changed, 26 insertions(+)
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943807 |
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943807 |
--- a/openbsd-compat/bsd-closefrom.c
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943807 |
+++ b/openbsd-compat/bsd-closefrom.c
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943807 |
@@ -82,7 +82,33 @@ closefrom(int lowfd)
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943807 |
fd = strtol(dent->d_name, &endp, 10);
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943807 |
if (dent->d_name != endp && *endp == '\0' &&
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943807 |
fd >= 0 && fd < INT_MAX && fd >= lowfd && fd != dirfd(dirp))
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943807 |
+#ifdef __s390__
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943807 |
+ {
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943807 |
+ /*
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943807 |
+ * the filedescriptors used to communicate with
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943807 |
+ * the device drivers to provide hardware support
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943807 |
+ * should survive. HF <freude@de.ibm.com>
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943807 |
+ */
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943807 |
+ char fpath[PATH_MAX], lpath[PATH_MAX];
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943807 |
+ len = snprintf(fpath, sizeof(fpath), "%s/%s",
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943807 |
+ fdpath, dent->d_name);
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943807 |
+ if (len > 0 && (size_t)len <= sizeof(fpath)) {
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943807 |
+ len = readlink(fpath, lpath, sizeof(lpath));
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943807 |
+ if (len > 0) {
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943807 |
+ lpath[len] = 0;
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943807 |
+ if (strstr(lpath, "dev/z90crypt")
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943807 |
+ || strstr(lpath, "dev/zcrypt")
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943807 |
+ || strstr(lpath, "dev/prandom")
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943807 |
+ || strstr(lpath, "dev/shm/icastats"))
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943807 |
+ fd = -1;
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943807 |
+ }
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943807 |
+ }
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943807 |
+ if (fd >= 0)
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943807 |
+ (void) close((int) fd);
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943807 |
+ }
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943807 |
+#else
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943807 |
(void) close((int) fd);
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943807 |
+#endif
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943807 |
}
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943807 |
(void) closedir(dirp);
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943807 |
return;
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943807 |
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