Approved by: gallatin (mentor)

Sync with i386.
Don't write crashdumps outside partition boundaries.

1 files changed, 12 insertions, 0 deletions

diff --git a/sys/alpha/alpha/dump_machdep.c b/sys/alpha/alpha/dump_machdep.c
index 902cf12..63f98e2 100644
--- a/sys/alpha/alpha/dump_machdep.c
+++ b/sys/alpha/alpha/dump_machdep.c
@@ -73,6 +73,18 @@ dumpsys(struct dumperinfo *di)
 		strncpy(kdh.panicstring, panicstr, sizeof kdh.panicstring);
 	kdh.parity = kerneldump_parity(&kdh);
 
+	/*
+	 * Check if we will have enough room to save the coredump.
+	 * The partition size needed is the sum of:
+	 * Memory to save + header + trailer + Room to leave untouched
+	 * at partition head. (an arbitrary amount).
+	 */
+	if (di->mediasize <  
+	    Maxmem * (off_t)PAGE_SIZE + sizeof kdh * 2 + 64*1024) {
+		printf("\nDump failed. Partition too small.\n");
+		return;
+	}
+
 	dumplo = di->mediaoffset + di->mediasize - Maxmem * (off_t)PAGE_SIZE;
 	dumplo -= sizeof kdh * 2;
 	i = di->dumper(di->priv, &kdh, NULL, dumplo, sizeof kdh);