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Replace any '\' char with '\\' in table specification on input.

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Device-mapper in kernel uses '\' as escape character so it's better
to double it to avoid any confusion when using existing device names
with '\' in the table specification.

For example:

dmsetup create x --table "0 8 linear /dev/mapper/a\x20b 0"

should pass just fine now without a need to explicitly escape the '\' char
like this:

dmsetup create x --table "0 8 linear /dev/mapper/a\\x20b 0"
This commit is contained in:
Peter Rajnoha 2012-02-15 12:17:34 +00:00
parent 7f024cf822
commit 17696422b6
2 changed files with 23 additions and 3 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.71 -
====================================
Replace any '\' char with '\\' in table specification on input.
Add mangle command to dmsetup to provide renaming to correct mangled form.
Add 'mangled_name' and 'unmangled_name' fields to dmsetup info -c -o.
Add --manglename option to dmsetup to select the name mangling mode.

25
libdm/ioctl/libdm-iface.c
View File

@ -866,7 +866,9 @@ static char *_add_target(struct target *t, char *out, char *end)
char *out_sp = out;
struct dm_target_spec sp;
size_t sp_size = sizeof(struct dm_target_spec);
unsigned int backslash_count = 0;
int len;
char *pt;
if (strlen(t->type) >= sizeof(sp.target_type)) {
log_error("Target type name %s is too long.", t->type);
@ -880,15 +882,32 @@ static char *_add_target(struct target *t, char *out, char *end)
sp.target_type[sizeof(sp.target_type) - 1] = '\0';
out += sp_size;
len = strlen(t->params);
pt = t->params;
while (*pt)
if (*pt++ == '\\')
backslash_count++;
len = strlen(t->params) + backslash_count;
if ((out >= end) || (out + len + 1) >= end) {
log_error("Ran out of memory building ioctl parameter");
return NULL;
}
strcpy(out, t->params);
out += len + 1;
if (backslash_count) {
/* replace "\" with "\\" */
pt = t->params;
do {
if (*pt == '\\')
*out++ = '\\';
*out++ = *pt++;
} while (*pt);
*out++ = '\0';
}
else {
strcpy(out, t->params);
out += len + 1;
}
/* align next block */
out = _align(out, ALIGNMENT);