[PATCH] Kcore elf note namesz field fix

o As per ELF specifications, it looks like that elf note "namesz" field
  contains the length of "name" including the size of null character.  And
  currently we are filling "namesz" without taking into the consideration
  the null character size.

o Kexec-tools performs this check deligently hence I ran into the issue
  while trying to open /proc/kcore in kexec-tools for some info.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 3ceff385727273269018a6e4780a97a6bd234cc6..1294eda4acaeefc5739bd4ad267a7fca2dd679dd 100644 (file)
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -100,7 +100,7 @@ static int notesize(struct memelfnote *en)
        int sz;
 
        sz = sizeof(struct elf_note);
-       sz += roundup(strlen(en->name), 4);
+       sz += roundup((strlen(en->name) + 1), 4);
        sz += roundup(en->datasz, 4);
 
        return sz;
@@ -116,7 +116,7 @@ static char *storenote(struct memelfnote *men, char *bufp)
 
 #define DUMP_WRITE(addr,nr) do { memcpy(bufp,addr,nr); bufp += nr; } while(0)
 
-       en.n_namesz = strlen(men->name);
+       en.n_namesz = strlen(men->name) + 1;
        en.n_descsz = men->datasz;
        en.n_type = men->type;