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kern/misc: Add STRING type for internal printf() format handling

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Set printf() argument type for "%s" to new type STRING. This is in
preparation for a follow up patch to compare a printf() format string
against an expected printf() format string.

For "%s" the corresponding printf() argument is dereferenced as pointer
while all other argument types are defined as integer value. However,
when validating a printf() format it is necessary to differentiate "%s"
from "%p" and other integers. So, let's do that.

Signed-off-by: Thomas Frauendorfer | Miray Software <tf@miray.de>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Thomas Frauendorfer | Miray Software authored and Daniel Kiper committed 2021-03-02 15:54:20 +01:00
1 parent 7f11bde314
commit 1a2a5aff71
1 file changed
+11 -2
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grub-core/kern/misc.c
+11 -2
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@@ -33,7 +33,8 @@ union printf_arg
enum
{
INT, LONG, LONGLONG,
UNSIGNED_INT = 3, UNSIGNED_LONG, UNSIGNED_LONGLONG
UNSIGNED_INT = 3, UNSIGNED_LONG, UNSIGNED_LONGLONG,
STRING
} type;
long long ll;
};
@@ -791,12 +792,14 @@ parse_printf_arg_fmt (const char *fmt0, struct printf_args *args)
args->ptr[curn].type = INT + longfmt;
break;
case 'p':
case 's':
if (sizeof (void *) == sizeof (long long))
args->ptr[curn].type = UNSIGNED_LONGLONG;
else
args->ptr[curn].type = UNSIGNED_INT;
break;
case 's':
args->ptr[curn].type = STRING;
break;
case 'C':
case 'c':
args->ptr[curn].type = INT;
@@ -831,6 +834,12 @@ parse_printf_args (const char *fmt0, struct printf_args *args, va_list args_in)
case UNSIGNED_LONGLONG:
args->ptr[n].ll = va_arg (args_in, long long);
break;
case STRING:
if (sizeof (void *) == sizeof (long long))
args->ptr[n].ll = va_arg (args_in, long long);
else
args->ptr[n].ll = va_arg (args_in, unsigned int);
break;
}
}