From 035c9e559064114e3f7ba19b593a97c4a4d4f060 Mon Sep 17 00:00:00 2001

From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>

Date: Sat, 28 Dec 2013 19:33:23 -0500

Subject: [PATCH] journal: fix access to munmapped memory in

 sd_journal_enumerate_unique

sd_j_e_u needs to keep a reference to an object while comparing it

with possibly duplicate objects in other files. Because the size of

mmap cache is limited, with enough files and object to compare to,

at some point the object being compared would be munmapped, resulting

in a segmentation fault.

Fix this issue by turning keep_always into a reference count that can

be increased and decreased. Other callers which set keep_always=true

are unmodified: their references are never released but are ignored

when the whole file is closed, which happens at some point. keep_always

is increased in sd_j_e_u and later on released.

---

 src/journal/journal-file.c   |  5 +---

 src/journal/journal-file.h   | 24 +++++++++++++++++++

 src/journal/journal-verify.c |  4 ----

 src/journal/mmap-cache.c     | 57 +++++++++++++++++++++++++++++++++++---------

 src/journal/mmap-cache.h     | 18 +++++++++++++-

 src/journal/sd-journal.c     | 18 +++++++++++---

 6 files changed, 103 insertions(+), 23 deletions(-)

diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c

index 748816a..9dbd674 100644

--- a/src/journal/journal-file.c

+++ b/src/journal/journal-file.c

@@ -419,7 +419,6 @@ int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Objec

         void *t;

         Object *o;

         uint64_t s;

-        unsigned context;

         assert(f);

         assert(ret);

@@ -428,10 +427,8 @@ int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Objec

         if (!VALID64(offset))

                 return -EFAULT;

-        /* One context for each type, plus one catch-all for the rest */

-        context = type > 0 && type < _OBJECT_TYPE_MAX ? type : 0;

-        r = journal_file_move_to(f, context, false, offset, sizeof(ObjectHeader), &t);

+        r = journal_file_move_to(f, type_to_context(type), false, offset, sizeof(ObjectHeader), &t);

         if (r < 0)

                 return r;

diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h

index 5cc2c2d..376c3d4 100644

--- a/src/journal/journal-file.h

+++ b/src/journal/journal-file.h

@@ -128,6 +128,10 @@ int journal_file_open_reliably(

 #define ALIGN64(x) (((x) + 7ULL) & ~7ULL)

 #define VALID64(x) (((x) & 7ULL) == 0ULL)

+/* Use six characters to cover the offsets common in smallish journal

+ * files without adding too many zeros. */

+#define OFSfmt "%06"PRIx64

+

 static inline bool VALID_REALTIME(uint64_t u) {

         /* This considers timestamps until the year 3112 valid. That should be plenty room... */

         return u > 0 && u < (1ULL << 55);

@@ -197,3 +201,23 @@ int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *

 int journal_file_get_cutoff_monotonic_usec(JournalFile *f, sd_id128_t boot, usec_t *from, usec_t *to);

 bool journal_file_rotate_suggested(JournalFile *f, usec_t max_file_usec);

+

+

+static unsigned type_to_context(int type) {

+        /* One context for each type, plus one catch-all for the rest */

+        return type > 0 && type < _OBJECT_TYPE_MAX ? type : 0;

+}

+

+static inline int journal_file_object_keep(JournalFile *f, Object *o, uint64_t offset) {

+        unsigned context = type_to_context(o->object.type);

+

+        return mmap_cache_get(f->mmap, f->fd, f->prot, context, true,

+                              offset, o->object.size, &f->last_stat, NULL);

+}

+

+static inline int journal_file_object_release(JournalFile *f, Object *o, uint64_t offset) {

+        unsigned context = type_to_context(o->object.type);

+

+        return mmap_cache_release(f->mmap, f->fd, f->prot, context,

+                                  offset, o->object.size);

+}

diff --git a/src/journal/journal-verify.c b/src/journal/journal-verify.c

index 82b0f0a..f2422ff 100644

--- a/src/journal/journal-verify.c

+++ b/src/journal/journal-verify.c

@@ -34,10 +34,6 @@

 #include "compress.h"

 #include "fsprg.h"

-/* Use six characters to cover the offsets common in smallish journal

- * files without adding to many zeros. */

-#define OFSfmt "%06"PRIx64

-

 static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o) {

         uint64_t i;

diff --git a/src/journal/mmap-cache.c b/src/journal/mmap-cache.c

index 03b57be..cfb26da 100644

--- a/src/journal/mmap-cache.c

+++ b/src/journal/mmap-cache.c

@@ -38,7 +38,7 @@ typedef struct FileDescriptor FileDescriptor;

 struct Window {

         MMapCache *cache;

-        bool keep_always;

+        unsigned keep_always;

         bool in_unused;

         int prot;

@@ -182,7 +182,7 @@ static void context_detach_window(Context *c) {

         c->window = NULL;

         LIST_REMOVE(Context, by_window, w->contexts, c);

-        if (!w->contexts && !w->keep_always) {

+        if (!w->contexts && w->keep_always == 0) {

                 /* Not used anymore? */

                 LIST_PREPEND(Window, unused, c->cache->unused, w);

                 if (!c->cache->last_unused)

@@ -357,7 +357,6 @@ static int try_context(

         assert(m->n_ref > 0);

         assert(fd >= 0);

         assert(size > 0);

-        assert(ret);

         c = hashmap_get(m->contexts, UINT_TO_PTR(context+1));

         if (!c)

@@ -375,9 +374,10 @@ static int try_context(

                 return 0;

         }

-        c->window->keep_always = c->window->keep_always || keep_always;

+        c->window->keep_always += keep_always;

-        *ret = (uint8_t*) c->window->ptr + (offset - c->window->offset);

+        if (ret)

+                *ret = (uint8_t*) c->window->ptr + (offset - c->window->offset);

         return 1;

 }

@@ -399,7 +399,6 @@ static int find_mmap(

         assert(m->n_ref > 0);

         assert(fd >= 0);

         assert(size > 0);

-        assert(ret);

         f = hashmap_get(m->fds, INT_TO_PTR(fd + 1));

         if (!f)

@@ -419,9 +418,10 @@ static int find_mmap(

                 return -ENOMEM;

         context_attach_window(c, w);

-        w->keep_always = w->keep_always || keep_always;

+        w->keep_always += keep_always;

-        *ret = (uint8_t*) w->ptr + (offset - w->offset);

+        if (ret)

+                *ret = (uint8_t*) w->ptr + (offset - w->offset);

         return 1;

 }

@@ -447,7 +447,6 @@ static int add_mmap(

         assert(m->n_ref > 0);

         assert(fd >= 0);

         assert(size > 0);

-        assert(ret);

         woffset = offset & ~((uint64_t) page_size() - 1ULL);

         wsize = size + (offset - woffset);

@@ -517,7 +516,8 @@ static int add_mmap(

         c->window = w;

         LIST_PREPEND(Context, by_window, w->contexts, c);

-        *ret = (uint8_t*) w->ptr + (offset - w->offset);

+        if (ret)

+                *ret = (uint8_t*) w->ptr + (offset - w->offset);

         return 1;

 }

@@ -538,7 +538,6 @@ int mmap_cache_get(

         assert(m->n_ref > 0);

         assert(fd >= 0);

         assert(size > 0);

-        assert(ret);

         /* Check whether the current context is the right one already */

         r = try_context(m, fd, prot, context, keep_always, offset, size, ret);

@@ -554,6 +553,42 @@ int mmap_cache_get(

         return add_mmap(m, fd, prot, context, keep_always, offset, size, st, ret);

 }

+int mmap_cache_release(

+                MMapCache *m,

+                int fd,

+                int prot,

+                unsigned context,

+                uint64_t offset,

+                size_t size) {

+

+        FileDescriptor *f;

+        Window *w;

+

+        assert(m);

+        assert(m->n_ref > 0);

+        assert(fd >= 0);

+        assert(size > 0);

+

+        f = hashmap_get(m->fds, INT_TO_PTR(fd + 1));

+        if (!f)

+                return -EBADF;

+

+        assert(f->fd == fd);

+

+        LIST_FOREACH(by_fd, w, f->windows)

+                if (window_matches(w, fd, prot, offset, size))

+                        break;

+

+        if (!w)

+                return -ENOENT;

+

+        if (w->keep_always == 0)

+                return -ENOLCK;

+

+        w->keep_always -= 1;

+        return 0;

+}

+

 void mmap_cache_close_fd(MMapCache *m, int fd) {

         FileDescriptor *f;

diff --git a/src/journal/mmap-cache.h b/src/journal/mmap-cache.h

index 0c42fb8..e5e3b38 100644

--- a/src/journal/mmap-cache.h

+++ b/src/journal/mmap-cache.h

@@ -31,6 +31,22 @@ MMapCache* mmap_cache_new(void);

 MMapCache* mmap_cache_ref(MMapCache *m);

 MMapCache* mmap_cache_unref(MMapCache *m);

-int mmap_cache_get(MMapCache *m, int fd, int prot, unsigned context, bool keep_always, uint64_t offset, size_t size, struct stat *st, void **ret);

+int mmap_cache_get(

+        MMapCache *m,

+        int fd,

+        int prot,

+        unsigned context,

+        bool keep_always,

+        uint64_t offset,

+        size_t size,

+        struct stat *st,

+        void **ret);

+int mmap_cache_release(

+        MMapCache *m,

+        int fd,

+        int prot,

+        unsigned context,

+        uint64_t offset,

+        size_t size);

 void mmap_cache_close_fd(MMapCache *m, int fd);

 void mmap_cache_close_context(MMapCache *m, unsigned context);

diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c

index 9676f0f..67a77e6 100644

--- a/src/journal/sd-journal.c

+++ b/src/journal/sd-journal.c

@@ -2506,9 +2506,7 @@ _public_ int sd_journal_query_unique(sd_journal *j, const char *field) {

 }

 _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) {

-        Object *o;

         size_t k;

-        int r;

         if (!j)

                 return -EINVAL;

@@ -2533,9 +2531,11 @@ _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_

         for (;;) {

                 JournalFile *of;

                 Iterator i;

+                Object *o;

                 const void *odata;

                 size_t ol;

                 bool found;

+                int r;

                 /* Proceed to next data object in the field's linked list */

                 if (j->unique_offset == 0) {

@@ -2572,8 +2572,16 @@ _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_

                         return r;

                 /* Let's do the type check by hand, since we used 0 context above. */

-                if (o->object.type != OBJECT_DATA)

+                if (o->object.type != OBJECT_DATA) {

+                        log_error("%s:offset " OFSfmt ": object has type %d, expected %d",

+                                  j->unique_file->path, j->unique_offset,

+                                  o->object.type, OBJECT_DATA);

                         return -EBADMSG;

+                }

+

+                r = journal_file_object_keep(j->unique_file, o, j->unique_offset);

+                if (r < 0)

+                        return r;

                 r = return_data(j, j->unique_file, o, &odata, &ol);

                 if (r < 0)

@@ -2607,6 +2615,10 @@ _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_

                 if (found)

                         continue;

+                r = journal_file_object_release(j->unique_file, o, j->unique_offset);

+                if (r < 0)

+                        return r;

+

                 r = return_data(j, j->unique_file, o, data, l);

                 if (r < 0)

                         return r;