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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Thomas Frauendorfer | Miray Software <tf@miray.de>
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Date: Mon, 15 Feb 2021 14:04:26 +0100
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Subject: [PATCH] kern/misc: Add STRING type for internal printf() format
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handling
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Set printf() argument type for "%s" to new type STRING. This is in
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preparation for a follow up patch to compare a printf() format string
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against an expected printf() format string.
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For "%s" the corresponding printf() argument is dereferenced as pointer
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while all other argument types are defined as integer value. However,
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when validating a printf() format it is necessary to differentiate "%s"
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from "%p" and other integers. So, let's do that.
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Signed-off-by: Thomas Frauendorfer | Miray Software <tf@miray.de>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/kern/misc.c | 13 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletions(-)
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diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c
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index ca851c29d51..9e2a237b118 100644
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--- a/grub-core/kern/misc.c
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+++ b/grub-core/kern/misc.c
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@@ -34,7 +34,8 @@ union printf_arg
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enum
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{
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INT, LONG, LONGLONG,
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- UNSIGNED_INT = 3, UNSIGNED_LONG, UNSIGNED_LONGLONG
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+ UNSIGNED_INT = 3, UNSIGNED_LONG, UNSIGNED_LONGLONG,
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+ STRING
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} type;
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long long ll;
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};
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@@ -824,12 +825,14 @@ parse_printf_arg_fmt (const char *fmt0, struct printf_args *args)
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args->ptr[curn].type = INT + longfmt;
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break;
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case 'p':
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- case 's':
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if (sizeof (void *) == sizeof (long long))
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args->ptr[curn].type = UNSIGNED_LONGLONG;
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else
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args->ptr[curn].type = UNSIGNED_INT;
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break;
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+ case 's':
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+ args->ptr[curn].type = STRING;
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+ break;
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case 'C':
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case 'c':
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args->ptr[curn].type = INT;
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@@ -864,6 +867,12 @@ parse_printf_args (const char *fmt0, struct printf_args *args, va_list args_in)
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case UNSIGNED_LONGLONG:
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args->ptr[n].ll = va_arg (args_in, long long);
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break;
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+ case STRING:
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+ if (sizeof (void *) == sizeof (long long))
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+ args->ptr[n].ll = va_arg (args_in, long long);
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+ else
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+ args->ptr[n].ll = va_arg (args_in, unsigned int);
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+ break;
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}
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}
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