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[PATCH] initramfs: fix CPIO hardlink check 

Copy the filenames of hardlinks when inserting them into the hash, since
the "name" pointer may point to scratch space (name_buf).  Not doing so
results in corruption if the scratch space is later overwritten: the wrong
file may be hardlinked, or, if the scratch space contains garbage, the link
will fail and a 0-byte file will be created instead.

Signed-off-by: Mark Huang <mlhuang@cs.princeton.edu>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mark Huang 2006-05-15 09:44:03 -07:00 committed by Linus Torvalds
parent 698d070746
commit 6a050da45b
1 changed files with 4 additions and 4 deletions
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8
init/initramfs.c
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@ -26,10 +26,12 @@ static void __init free(void *where)
/* link hash */
#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
static __initdata struct hash {
int ino, minor, major;
struct hash *next;
char *name;
char name[N_ALIGN(PATH_MAX)];
} *head[32];
static inline int hash(int major, int minor, int ino)
@ -57,7 +59,7 @@ static char __init *find_link(int major, int minor, int ino, char *name)
q->ino = ino;
q->minor = minor;
q->major = major;
q->name = name;
strcpy(q->name, name);
q->next = NULL;
*p = q;
return NULL;
@ -133,8 +135,6 @@ static inline void eat(unsigned n)
count -= n;
}
#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
static __initdata char *collected;
static __initdata int remains;
static __initdata char *collect;