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From 23ed36735af09c258e542266aaed92cdd8571c6c Mon Sep 17 00:00:00 2001
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From: Florian Weimer <fweimer@redhat.com>
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Date: Thu, 16 Jul 2020 16:21:28 +0200
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Subject: [PATCH 02/11] nss_compat: Do not use mmap to read database files (bug
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26258)
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This avoids crashes in case the files are truncated for some reason.
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For typically file sizes, it is also going to be slightly faster.
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Using __nss_files_fopen instead mirrors what nss_files does.
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Tested-by: Carlos O'Donell <carlos@redhat.com>
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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---
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nss/nss_compat/compat-grp.c | 6 ++----
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nss/nss_compat/compat-initgroups.c | 6 ++----
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nss/nss_compat/compat-pwd.c | 6 ++----
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nss/nss_compat/compat-spwd.c | 6 ++----
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4 files changed, 8 insertions(+), 16 deletions(-)
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diff -rup a/nss/nss_compat/compat-grp.c b/nss/nss_compat/compat-grp.c
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--- a/nss/nss_compat/compat-grp.c 2020-09-14 15:49:18.248178627 -0400
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+++ b/nss/nss_compat/compat-grp.c 2020-09-14 17:18:22.514977541 -0400
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@@ -26,6 +26,7 @@
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#include <string.h>
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#include <libc-lock.h>
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#include <kernel-features.h>
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+#include <nss_files.h>
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static service_user *ni;
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static enum nss_status (*nss_setgrent) (int stayopen);
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@@ -106,13 +107,10 @@ internal_setgrent (ent_t *ent, int stayo
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if (ent->stream == NULL)
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{
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- ent->stream = fopen ("/etc/group", "rme");
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+ ent->stream = __nss_files_fopen ("/etc/group");
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if (ent->stream == NULL)
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status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
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- else
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- /* We take care of locking ourself. */
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- __fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
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}
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else
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rewind (ent->stream);
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diff -rup a/nss/nss_compat/compat-initgroups.c b/nss/nss_compat/compat-initgroups.c
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--- a/nss/nss_compat/compat-initgroups.c 2020-09-14 15:49:18.255178892 -0400
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+++ b/nss/nss_compat/compat-initgroups.c 2020-09-14 17:18:22.519977728 -0400
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@@ -29,6 +29,7 @@
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#include <libc-lock.h>
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#include <kernel-features.h>
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#include <scratch_buffer.h>
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+#include <nss_files.h>
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static service_user *ni;
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/* Type of the lookup function. */
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@@ -121,13 +122,10 @@ internal_setgrent (ent_t *ent)
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else
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ent->blacklist.current = 0;
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- ent->stream = fopen ("/etc/group", "rme");
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+ ent->stream = __nss_files_fopen ("/etc/group");
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if (ent->stream == NULL)
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status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
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- else
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- /* We take care of locking ourself. */
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- __fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
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return status;
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}
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diff -rup a/nss/nss_compat/compat-pwd.c b/nss/nss_compat/compat-pwd.c
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--- a/nss/nss_compat/compat-pwd.c 2020-09-14 15:49:18.260179081 -0400
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+++ b/nss/nss_compat/compat-pwd.c 2020-09-14 17:18:22.523977879 -0400
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@@ -27,6 +27,7 @@
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#include <string.h>
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#include <libc-lock.h>
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#include <kernel-features.h>
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+#include <nss_files.h>
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#include "netgroup.h"
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#include "nisdomain.h"
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@@ -221,13 +222,10 @@ internal_setpwent (ent_t *ent, int stayo
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if (ent->stream == NULL)
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{
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- ent->stream = fopen ("/etc/passwd", "rme");
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+ ent->stream = __nss_files_fopen ("/etc/passwd");
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if (ent->stream == NULL)
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status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
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- else
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- /* We take care of locking ourself. */
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- __fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
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}
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else
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rewind (ent->stream);
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diff -rup a/nss/nss_compat/compat-spwd.c b/nss/nss_compat/compat-spwd.c
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--- a/nss/nss_compat/compat-spwd.c 2020-09-14 15:49:18.264179232 -0400
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+++ b/nss/nss_compat/compat-spwd.c 2020-09-14 17:18:22.527978029 -0400
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@@ -27,6 +27,7 @@
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#include <string.h>
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#include <libc-lock.h>
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#include <kernel-features.h>
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+#include <nss_files.h>
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#include "netgroup.h"
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#include "nisdomain.h"
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@@ -177,13 +178,10 @@ internal_setspent (ent_t *ent, int stayo
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if (ent->stream == NULL)
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{
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- ent->stream = fopen ("/etc/shadow", "rme");
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+ ent->stream = __nss_files_fopen ("/etc/shadow");
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if (ent->stream == NULL)
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status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
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- else
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- /* We take care of locking ourself. */
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- __fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
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}
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else
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rewind (ent->stream);
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