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