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The MBR uses a 32-bit unsigned integer to store the size of a slice, but

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fdisk(1) internally uses a signed int.  Should a user attempt to specify
a slice containing more than 2^31 - 1 sectors, an error will be reported
on systems with sizeof(long) == 4 and the slice size will be silently
truncated on systems with sizeof(long) > 4.

Instead use an unsigned long to store the slice size in fdisk(1).  This
allows the user to specify a slice size up to the maximum permitted by
the MBR on-disk format and does not have any problems with silent
truncation should the use specify an slice size larger than 2^32 on systems
with sizeof(long) > 4.

Submitted by:	Mark Johnston (markjdb AT gmail DOT com)
MFC after:	2 weeks
This commit is contained in:
rstone 2011-07-17 21:08:16 +00:00
parent c55f34f6d6
commit cecff2d26e
1 changed files with 4 additions and 4 deletions
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8
sbin/fdisk/fdisk.c
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@ -108,9 +108,9 @@ typedef struct cmd {
char cmd;
int n_args;
struct arg {
char argtype;
int arg_val;
char *arg_str;
char argtype;
unsigned long arg_val;
char * arg_str;
} args[MAX_ARGS];
} CMD;
@ -990,7 +990,7 @@ parse_config_line(char *line, CMD *command)
if (isalpha(*cp))
command->args[command->n_args].argtype = *cp++;
end = NULL;
command->args[command->n_args].arg_val = strtol(cp, &end, 0);
command->args[command->n_args].arg_val = strtoul(cp, &end, 0);
if (cp == end || (!isspace(*end) && *end != '\0')) {
char ch;
end = cp;