X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fjournal%2Fcoredump.c;h=fd03e389bb332a53e44584eecfef37fb00613908;hb=c5a10d9ca017be6133154e09383c84c3d5b85f7c;hp=c56d2832682778aa1541030e3cfb6f397188fbc0;hpb=5e75606a419059e6fbd8705b0b60c183c8aca246;p=elogind.git

diff --git a/src/journal/coredump.c b/src/journal/coredump.c
index c56d28326..fd03e389b 100644
--- a/src/journal/coredump.c
+++ b/src/journal/coredump.c
@@ -37,6 +37,10 @@
 #include "special.h"
 #include "cgroup-util.h"
 
+/* Few programs have less than 3MiB resident */
+#define COREDUMP_MIN_START (3*1024*1024)
+/* Make sure to not make this larger than the maximum journal entry
+ * size. See ENTRY_SIZE_MAX in journald-native.c. */
 #define COREDUMP_MAX (768*1024*1024)
 
 enum {
@@ -101,9 +105,10 @@ int main(int argc, char* argv[]) {
         uid_t uid;
         gid_t gid;
         struct iovec iovec[14];
-        char _cleanup_free_ *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
+        size_t coredump_bufsize, coredump_size;
+        _cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
                 *core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL,
-                *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *p = NULL;
+                *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL;
 
         prctl(PR_SET_DUMPABLE, 0);
 
@@ -232,23 +237,35 @@ int main(int argc, char* argv[]) {
                 goto finish;
         }
 
-        p = malloc(9 + COREDUMP_MAX);
-        if (!p) {
+        coredump_bufsize = COREDUMP_MIN_START;
+        coredump_data = malloc(coredump_bufsize);
+        if (!coredump_data) {
                 r = log_oom();
                 goto finish;
         }
 
-        memcpy(p, "COREDUMP=", 9);
+        memcpy(coredump_data, "COREDUMP=", 9);
+        coredump_size = 9;
 
-        n = loop_read(STDIN_FILENO, p + 9, COREDUMP_MAX, false);
-        if (n < 0) {
-                log_error("Failed to read core dump data: %s", strerror(-n));
-                r = (int) n;
-                goto finish;
+        for (;;) {
+                n = loop_read(STDIN_FILENO, coredump_data + coredump_size,
+                              coredump_bufsize - coredump_size, false);
+                if (n < 0) {
+                        log_error("Failed to read core dump data: %s", strerror(-n));
+                        r = (int) n;
+                        goto finish;
+                } else if (n == 0)
+                        break;
+
+                coredump_size += n;
+                if (!GREEDY_REALLOC(coredump_data, coredump_bufsize, coredump_size + 1)) {
+                        r = log_oom();
+                        goto finish;
+                }
         }
 
-        iovec[j].iov_base = p;
-        iovec[j].iov_len = 9 + n;
+        iovec[j].iov_base = coredump_data;
+        iovec[j].iov_len = coredump_size;
         j++;
 
         r = sd_journal_sendv(iovec, j);