fs/coredump: Enable dynamic configuration of max file note size

[linux-2.6-block.git] / fs / coredump.c

diff --git a/fs/coredump.c b/fs/coredump.c
index be6403b4b14b6a26e611398f0903244d1af96343..317065e3eb9bb0969ea73fbef46fd8d345ccfe2c 100644 (file)
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -56,10 +56,15 @@
 static bool dump_vma_snapshot(struct coredump_params *cprm);
 static void free_vma_snapshot(struct coredump_params *cprm);
 
+#define CORE_FILE_NOTE_SIZE_DEFAULT (4*1024*1024)
+/* Define a reasonable max cap */
+#define CORE_FILE_NOTE_SIZE_MAX (16*1024*1024)
+
 static int core_uses_pid;
 static unsigned int core_pipe_limit;
 static char core_pattern[CORENAME_MAX_SIZE] = "core";
 static int core_name_size = CORENAME_MAX_SIZE;
+unsigned int core_file_note_size_limit = CORE_FILE_NOTE_SIZE_DEFAULT;
 
 struct core_name {
        char *corename;
@@ -998,6 +1003,9 @@ static int proc_dostring_coredump(struct ctl_table *table, int write,
        return error;
 }
 
+static const unsigned int core_file_note_size_min = CORE_FILE_NOTE_SIZE_DEFAULT;
+static const unsigned int core_file_note_size_max = CORE_FILE_NOTE_SIZE_MAX;
+
 static struct ctl_table coredump_sysctls[] = {
        {
                .procname       = "core_uses_pid",
@@ -1020,6 +1028,15 @@ static struct ctl_table coredump_sysctls[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec,
        },
+       {
+               .procname       = "core_file_note_size_limit",
+               .data           = &core_file_note_size_limit,
+               .maxlen         = sizeof(unsigned int),
+               .mode           = 0644,
+               .proc_handler   = proc_douintvec_minmax,
+               .extra1         = (unsigned int *)&core_file_note_size_min,
+               .extra2         = (unsigned int *)&core_file_note_size_max,
+       },
 };
 
 static int __init init_fs_coredump_sysctls(void)