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Handle properly when insert zero size objects into the archive:

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Do not mmap 0-size objects and do not try to extract symbol from
0-size objects, but do treat 0-size objects as qualified objects and
accept them as an archive member. (A member with only the header part)

Note that GNU binutils ar on FreeBSD ignores 0-size objects, but on
Linux it accepts them. [1] But, since this is a rare usage, we can
safely ignore the compatibility issue.

Reported by:	Michael Plass <mfp49_freebsd [AT] plass-family [DOT] net>
Pointed out by: Michael Plass <mfp49_freebsd [AT] plass-family [DOT] net> [1]
Reviewed by:	Michael Plass <mfp49_freebsd [AT] plass-family [DOT] net>
Reviewed by:	jkoshy
Approved by:	jkoshy (mentor)
This commit is contained in:
Kai Wang 2008-02-24 17:57:29 +00:00
parent 72020fc2c1
commit 47203048ab
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=176525
1 changed files with 9 additions and 3 deletions
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12
usr.bin/ar/write.c
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@ -154,6 +154,12 @@ create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
obj->mtime = sb.st_mtime;
obj->dev = sb.st_dev;
obj->ino = sb.st_ino;
if (obj->size == 0) {
obj->maddr = NULL;
return(obj);
}
if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
@ -427,14 +433,14 @@ write_cleanup(struct bsdar *bsdar)
struct ar_obj *obj, *obj_temp;
TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
free(obj->name);
if (obj->fd == -1)
free(obj->maddr);
else
if (munmap(obj->maddr, obj->size))
if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
bsdar_warnc(bsdar, errno,
"can't munmap file: %s", obj->name);
TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
free(obj->name);
free(obj);
}
@ -478,7 +484,7 @@ write_objs(struct bsdar *bsdar)
/* Create archive symbol table and archive string table, if need. */
TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
if (!(bsdar->options & AR_SS))
if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
create_symtab_entry(bsdar, obj->maddr, obj->size);
if (strlen(obj->name) > _MAXNAMELEN_SVR4)
add_to_ar_str_table(bsdar, obj->name);