From: Peter Jones <pjo...@redhat.com>
Don't munge raw spaces when we're doing our cmdline escaping (#923374)
Signed-off-by: Peter Jones <pjo...@redhat.com>
---
grub-core/commands/wildcard.c | 16 ++++++++++++-
grub-core/lib/cmdline.c | 25 ++++++++++++++++++--
grub-core/script/execute.c | 43 ++++++++++++++++++++++++++++++-----
3 files changed, 75 insertions(+), 9 deletions(-)
diff --git a/grub-core/commands/wildcard.c b/grub-core/commands/wildcard.c
index ed6586505..5455242c3 100644
--- a/grub-core/commands/wildcard.c
+++ b/grub-core/commands/wildcard.c
@@ -488,6 +488,12 @@ check_file (const char *dir, const char *basename)
return ctx.found;
}
+static int
+is_hex(char c)
+{
+ return ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c
<= 'F'));
+}
+
static void
unescape (char *out, const char *in, const char *end)
{
@@ -496,7 +502,15 @@ unescape (char *out, const char *in, const char *end)
for (optr = out, iptr = in; iptr < end;)
{
- if (*iptr == '\\' && iptr + 1 < end)
+ if (*iptr == '\\' && iptr + 3 < end && iptr[1] == 'x' && is_hex(iptr[2])
&& is_hex(iptr[3]))
+ {
+ *optr++ = *iptr++;
+ *optr++ = *iptr++;
+ *optr++ = *iptr++;
+ *optr++ = *iptr++;
+ continue;
+ }
+ else if (*iptr == '\\' && iptr + 1 < end)
{
*optr++ = iptr[1];
iptr += 2;
diff --git a/grub-core/lib/cmdline.c b/grub-core/lib/cmdline.c
index ed0b149dc..8e2294d8f 100644
--- a/grub-core/lib/cmdline.c
+++ b/grub-core/lib/cmdline.c
@@ -20,6 +20,12 @@
#include <grub/lib/cmdline.h>
#include <grub/misc.h>
+static int
+is_hex(char c)
+{
+ return ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c
<= 'F'));
+}
+
static unsigned int check_arg (char *c, int *has_space)
{
int space = 0;
@@ -27,7 +33,13 @@ static unsigned int check_arg (char *c, int *has_space)
while (*c)
{
- if (*c == '\\' || *c == '\'' || *c == '"')
+ if (*c == '\\' && *(c+1) == 'x' && is_hex(*(c+2)) && is_hex(*(c+3)))
+ {
+ size += 4;
+ c += 4;
+ continue;
+ }
+ else if (*c == '\\' || *c == '\'' || *c == '"')
size++;
else if (*c == ' ')
space = 1;
@@ -86,7 +98,16 @@ grub_create_loader_cmdline (int argc, char *argv[], char
*buf,
while (*c)
{
- if (*c == '\\' || *c == '\'' || *c == '"')
+ if (*c == '\\' && *(c+1) == 'x' &&
+ is_hex(*(c+2)) && is_hex(*(c+3)))
+ {
+ *buf++ = *c++;
+ *buf++ = *c++;
+ *buf++ = *c++;
+ *buf++ = *c++;
+ continue;
+ }
+ else if (*c == '\\' || *c == '\'' || *c == '"')
*buf++ = '\\';
*buf++ = *c;
diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
index dab8fd2ae..c19b4bf70 100644
--- a/grub-core/script/execute.c
+++ b/grub-core/script/execute.c
@@ -56,6 +56,12 @@ static struct grub_script_scope *scope = 0;
/* Wildcard translator for GRUB script. */
struct grub_script_wildcard_translator *grub_wildcard_translator;
+static int
+is_hex(char c)
+{
+ return ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c
<= 'F'));
+}
+
static char*
wildcard_escape (const char *s)
{
@@ -72,7 +78,15 @@ wildcard_escape (const char *s)
i = 0;
while ((ch = *s++))
{
- if (ch == '*' || ch == '\\' || ch == '?')
+ if (ch == '\\' && s[0] == 'x' && is_hex(s[1]) && is_hex(s[2]))
+ {
+ p[i++] = ch;
+ p[i++] = *s++;
+ p[i++] = *s++;
+ p[i++] = *s++;
+ continue;
+ }
+ else if (ch == '*' || ch == '\\' || ch == '?')
p[i++] = '\\';
p[i++] = ch;
}
@@ -96,7 +110,14 @@ wildcard_unescape (const char *s)
i = 0;
while ((ch = *s++))
{
- if (ch == '\\')
+ if (ch == '\\' && s[0] == 'x' && is_hex(s[1]) && is_hex(s[2]))
+ {
+ p[i++] = '\\';
+ p[i++] = *s++;
+ p[i++] = *s++;
+ p[i++] = *s++;
+ }
+ else if (ch == '\\')
p[i++] = *s++;
else
p[i++] = ch;
@@ -398,10 +419,20 @@ parse_string (const char *str,
switch (*ptr)
{
case '\\':
- escaped = !escaped;
- if (!escaped && put)
- *(put++) = '\\';
- ptr++;
+ if (!escaped && put && *(ptr+1) == 'x' && is_hex(*(ptr+2)) &&
is_hex(*(ptr+3)))
+ {
+ *(put++) = *ptr++;
+ *(put++) = *ptr++;
+ *(put++) = *ptr++;
+ *(put++) = *ptr++;
+ }
+ else
+ {
+ escaped = !escaped;
+ if (!escaped && put)
+ *(put++) = '\\';
+ ptr++;
+ }
break;
case '$':
if (escaped)
--
2.46.1
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