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ldconfig should skip temporary files created by RPM (RHEL-13720)

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Resolves: RHEL-13720
This commit is contained in:
Florian Weimer 2023-11-21 09:41:35 +01:00
parent 159c3a720f
commit 8db9f8aab0
3 changed files with 139 additions and 1 deletions
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72
glibc-RHEL-13720-1.patch Normal file
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@ -0,0 +1,72 @@
commit 2aa0974d2573441bffd596b07bff8698b1f2f18c
Author: Florian Weimer <fweimer@redhat.com>
Date: Fri Oct 20 14:29:50 2023 +0200
elf: ldconfig should skip temporary files created by package managers
This avoids crashes due to partially written files, after a package
update is interrupted.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Conflicts:
elf/ldconfig.c
(missing alloca removal downstream)
diff --git a/elf/ldconfig.c b/elf/ldconfig.c
index 8c66d7e5426d8cc4..51de08f91fbaf093 100644
--- a/elf/ldconfig.c
+++ b/elf/ldconfig.c
@@ -771,6 +771,31 @@ struct dlib_entry
struct dlib_entry *next;
};
+/* Skip some temporary DSO files. These files may be partially written
+ and lead to ldconfig crashes when examined. */
+static bool
+skip_dso_based_on_name (const char *name, size_t len)
+{
+ /* Skip temporary files created by the prelink program. Files with
+ names like these are never really DSOs we want to look at. */
+ if (len >= sizeof (".#prelink#") - 1)
+ {
+ if (strcmp (name + len - sizeof (".#prelink#") + 1,
+ ".#prelink#") == 0)
+ return true;
+ if (len >= sizeof (".#prelink#.XXXXXX") - 1
+ && memcmp (name + len - sizeof (".#prelink#.XXXXXX")
+ + 1, ".#prelink#.", sizeof (".#prelink#.") - 1) == 0)
+ return true;
+ }
+ /* Skip temporary files created by RPM. */
+ if (memchr (name, len, ';') != NULL)
+ return true;
+ /* Skip temporary files created by dpkg. */
+ if (len > 4 && memcmp (name + len - 4, ".tmp", 4) == 0)
+ return true;
+ return false;
+}
static void
search_dir (const struct dir_entry *entry)
@@ -849,18 +874,8 @@ search_dir (const struct dir_entry *entry)
continue;
size_t len = strlen (direntry->d_name);
- /* Skip temporary files created by the prelink program. Files with
- names like these are never really DSOs we want to look at. */
- if (len >= sizeof (".#prelink#") - 1)
- {
- if (strcmp (direntry->d_name + len - sizeof (".#prelink#") + 1,
- ".#prelink#") == 0)
- continue;
- if (len >= sizeof (".#prelink#.XXXXXX") - 1
- && memcmp (direntry->d_name + len - sizeof (".#prelink#.XXXXXX")
- + 1, ".#prelink#.", sizeof (".#prelink#.") - 1) == 0)
- continue;
- }
+ if (skip_dso_based_on_name (direntry->d_name, len))
+ continue;
len += strlen (entry->path) + 2;
if (len > file_name_len)
{

61
glibc-RHEL-13720-2.patch Normal file
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@ -0,0 +1,61 @@
commit cfb5a97a93ea656e3b2263e42142a4032986d9ba
Author: Florian Weimer <fweimer@redhat.com>
Date: Mon Oct 23 12:53:16 2023 +0200
ldconfig: Fixes for skipping temporary files.
Arguments to a memchr call were swapped, causing incorrect skipping
of files.
Files related to dpkg have different names: they actually end in
.dpkg-new and .dpkg-tmp, not .tmp as I mistakenly assumed.
Fixes commit 2aa0974d2573441bffd59 ("elf: ldconfig should skip
temporary files created by package managers").
diff --git a/elf/ldconfig.c b/elf/ldconfig.c
index 51de08f91fbaf093..fb19dd68d41c07a4 100644
--- a/elf/ldconfig.c
+++ b/elf/ldconfig.c
@@ -771,6 +771,17 @@ struct dlib_entry
struct dlib_entry *next;
};
+/* Return true if the N bytes at NAME end with with the characters in
+ the string SUFFIX. (NAME[N + 1] does not have to be a null byte.)
+ Expected to be called with a string literal for SUFFIX. */
+static inline bool
+endswithn (const char *name, size_t n, const char *suffix)
+{
+ return (n >= strlen (suffix)
+ && memcmp (name + n - strlen (suffix), suffix,
+ strlen (suffix)) == 0);
+}
+
/* Skip some temporary DSO files. These files may be partially written
and lead to ldconfig crashes when examined. */
static bool
@@ -780,8 +791,7 @@ skip_dso_based_on_name (const char *name, size_t len)
names like these are never really DSOs we want to look at. */
if (len >= sizeof (".#prelink#") - 1)
{
- if (strcmp (name + len - sizeof (".#prelink#") + 1,
- ".#prelink#") == 0)
+ if (endswithn (name, len, ".#prelink#"))
return true;
if (len >= sizeof (".#prelink#.XXXXXX") - 1
&& memcmp (name + len - sizeof (".#prelink#.XXXXXX")
@@ -789,10 +799,11 @@ skip_dso_based_on_name (const char *name, size_t len)
return true;
}
/* Skip temporary files created by RPM. */
- if (memchr (name, len, ';') != NULL)
+ if (memchr (name, ';', len) != NULL)
return true;
/* Skip temporary files created by dpkg. */
- if (len > 4 && memcmp (name + len - 4, ".tmp", 4) == 0)
+ if (endswithn (name, len, ".dpkg-new")
+ || endswithn (name, len, ".dpkg-tmp"))
return true;
return false;
}

7
glibc.spec
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@ -1,6 +1,6 @@
%define glibcsrcdir glibc-2.28
%define glibcversion 2.28
%define glibcrelease 242%{?dist}
%define glibcrelease 243%{?dist}
# Pre-release tarballs are pulled in from git using a command that is
# effectively:
#
@ -1058,6 +1058,8 @@ Patch870: glibc-RHEL-2122.patch
Patch871: glibc-RHEL-1192.patch
Patch872: glibc-RHEL-3639.patch
Patch873: glibc-RHEL-10481.patch
Patch874: glibc-RHEL-13720-1.patch
Patch875: glibc-RHEL-13720-2.patch
##############################################################################
# Continued list of core "glibc" package information:
@ -2889,6 +2891,9 @@ fi
%files -f compat-libpthread-nonshared.filelist -n compat-libpthread-nonshared
%changelog
* Tue Nov 21 2023 Florian Weimer <fweimer@redhat.com> - 2.28-243
- ldconfig should skip temporary files created by RPM (RHEL-13720)
* Mon Nov 20 2023 Florian Weimer <fweimer@redhat.com> - 2.28-242
- Fix force-first handling in dlclose (RHEL-10481)