Blame SOURCES/0278-koops-add-suspicious-strings-blacklist.patch

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From a2cdf73fa34cf196b08932841d107a82c5bc16e5 Mon Sep 17 00:00:00 2001
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From: Matej Habrnal <mhabrnal@redhat.com>
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Date: Mon, 14 Aug 2017 13:34:59 +0200
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Subject: [PATCH] koops: add suspicious strings blacklist
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Some strings were accidentally considered suspicious.
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In this concrete case strings containing "DEBUG" substring.
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Since "BUG" and "DEBUG" overlaps and "BUG" is
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listed in suspicious string list, kernel DEBUG messages were
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recognized as "BUG"s which are kernel oops-es.
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Added "DEBUG" string into mentioned new blacklist.
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Related to rhbz#1228344
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Signed-off-by: Matej Habrnal <mhabrnal@redhat.com>
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---
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 src/include/libabrt.h |  2 ++
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 src/lib/kernel.c      | 60 ++++++++++++++++++++++++++++++++++-----------------
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 2 files changed, 42 insertions(+), 20 deletions(-)
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diff --git a/src/include/libabrt.h b/src/include/libabrt.h
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index 2510a77..5346328 100644
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--- a/src/include/libabrt.h
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+++ b/src/include/libabrt.h
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@@ -125,6 +125,8 @@ char *kernel_tainted_long(const char *tainted_short);
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 int koops_hash_str(char hash_str[SHA1_RESULT_LEN*2 + 1], const char *oops_buf);
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 #define koops_extract_oopses abrt_koops_extract_oopses
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 void koops_extract_oopses(GList **oops_list, char *buffer, size_t buflen);
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+#define koops_suspicious_strings_blacklist abrt_koops_suspicious_strings_blacklist
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+GList *koops_suspicious_strings_blacklist(void);
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 #define koops_print_suspicious_strings abrt_koops_print_suspicious_strings
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 void koops_print_suspicious_strings(void);
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 /**
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diff --git a/src/lib/kernel.c b/src/lib/kernel.c
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index 1a9d327..79e7424 100644
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--- a/src/lib/kernel.c
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+++ b/src/lib/kernel.c
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@@ -158,11 +158,46 @@ static const char *const s_koops_suspicious_strings[] = {
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     NULL
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 };
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+static const char *const s_koops_suspicious_strings_blacklist[] = {
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+    /* "BUG:" and "DEBUG:" overlaps, we don't want to recognize DEBUG messages as BUG */
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+    "DEBUG:",
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+
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+    /* Termination */
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+    NULL
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+};
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+
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+static bool suspicious_line(const char *line)
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+{
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+    const char *const *str = s_koops_suspicious_strings;
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+    for ( ; *str; ++str)
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+        if (strstr(line, *str))
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+            break;
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+
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+    if (!*str)
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+        return false;
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+
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+    str = s_koops_suspicious_strings_blacklist;
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+    for ( ; *str; ++str)
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+        if (strstr(line, *str))
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+           break;
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+
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+    return !*str;
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+}
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+
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 void koops_print_suspicious_strings(void)
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 {
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     koops_print_suspicious_strings_filtered(NULL);
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 }
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+GList *koops_suspicious_strings_blacklist(void)
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+{
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+    GList *strings = NULL;
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+    for (const char *const *str = s_koops_suspicious_strings_blacklist; *str; ++str)
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+        strings = g_list_prepend(strings, (gpointer)*str);
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+
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+    return strings;
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+}
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+
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 static bool match_any(const regex_t **res, const char *str)
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 {
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     for (const regex_t **r = res; *r != NULL; ++r)
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@@ -312,14 +347,8 @@ next_line:
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         if (oopsstart < 0)
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         {
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             /* Find start-of-oops markers */
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-            for (const char *const *str = s_koops_suspicious_strings; *str; ++str)
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-            {
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-                if (strstr(curline, *str))
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-                {
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-                    oopsstart = i;
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-                    break;
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-                }
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-            }
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+            if (suspicious_line(curline))
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+                oopsstart = i;
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             if (oopsstart >= 0)
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             {
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@@ -407,18 +436,9 @@ next_line:
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             /* kernel end-of-oops marker (not including marker itself) */
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             else if (strstr(curline, "---[ end trace"))
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                 oopsend = i-1;
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-            else
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-            {
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-                /* if a new oops starts, this one has ended */
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-                for (const char *const *str = s_koops_suspicious_strings; *str; ++str)
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-                {
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-                    if (strstr(curline, *str))
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-                    {
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-                        oopsend = i-1;
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-                        break;
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-                    }
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-                }
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-            }
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+            /* if a new oops starts, this one has ended */
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+            else if (suspicious_line(curline))
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+                oopsend = i-1;
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             if (oopsend <= i)
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             {
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-- 
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1.8.3.1
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