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authorJohn Crispin <blogic@openwrt.org>2014-11-19 14:09:19 +0000
committerJohn Crispin <blogic@openwrt.org>2014-11-19 14:09:19 +0000
commit794e4699e49c84cfeefcf18b2e7b843bf10ad19c (patch)
tree07c7f37726d69956f96c023db4e0bb55f2ffec18 /target/linux
parentc3d6194c74744adabfa83a02dc98319662a3e898 (diff)
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ixp4xx: Don't overwrite memory in wg302v1_fixup()
wg302v1_fixup() looks for the ATAG_CMDLINE atag, it doesn't find it and so it takes the last atag in the list and overwrites non allocated memory. The side effects are corrupted vital data and a kernel that doesn't boot. More details here https://dev.openwrt.org/ticket/18356 The fix appends the fixup to the command line and updates the atag only when it finds it. Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43320 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux')
-rw-r--r--target/linux/ixp4xx/patches-3.10/162-wg302v1_mem_fixup.patch24
1 files changed, 12 insertions, 12 deletions
diff --git a/target/linux/ixp4xx/patches-3.10/162-wg302v1_mem_fixup.patch b/target/linux/ixp4xx/patches-3.10/162-wg302v1_mem_fixup.patch
index 3d40802dca..75212bc2e7 100644
--- a/target/linux/ixp4xx/patches-3.10/162-wg302v1_mem_fixup.patch
+++ b/target/linux/ixp4xx/patches-3.10/162-wg302v1_mem_fixup.patch
@@ -4,13 +4,14 @@
&wg302v1_eth[0],
};
-+static char wg302v1_mem_fixup[] __initdata = "mem=32M ";
++static char wg302v1_mem_fixup[] __initdata = " mem=32M";
+
+static void __init wg302v1_fixup(struct tag *tags, char **cmdline,
+ struct meminfo *mi)
+{
+ struct tag *t = tags;
+ char *p = *cmdline;
++ size_t fixlen, cmdlen;
+
+ /* Find the end of the tags table, taking note of any cmdline tag. */
+ for (; t->hdr.size; t = tag_next(t)) {
@@ -19,18 +20,17 @@
+ }
+ }
+
-+ /* Overwrite the end of the table with a new cmdline tag. */
-+ t->hdr.tag = ATAG_CMDLINE;
-+ t->hdr.size = (sizeof (struct tag_header) +
-+ strlen(wg302v1_mem_fixup) + strlen(p) + 1 + 4) >> 2;
-+ strlcpy(t->u.cmdline.cmdline, wg302v1_mem_fixup, COMMAND_LINE_SIZE);
-+ strlcpy(t->u.cmdline.cmdline + strlen(wg302v1_mem_fixup), p,
-+ COMMAND_LINE_SIZE - strlen(wg302v1_mem_fixup));
++ fixlen = strlen(wg302v1_mem_fixup);
++ cmdlen = strlen(p);
++ if (fixlen + cmdlen >= COMMAND_LINE_SIZE)
++ return;
+
-+ /* Terminate the table. */
-+ t = tag_next(t);
-+ t->hdr.tag = ATAG_NONE;
-+ t->hdr.size = 0;
++ /* append the fixup to the cmdline */
++ memmove(p + cmdlen, wg302v1_mem_fixup, fixlen + 1);
++
++ /* Adjust the size of the atag if there was one */
++ if (t->hdr.size)
++ t->hdr.size += fixlen;
+}
+
static void __init wg302v1_init(void)