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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Javier Martinez Canillas <javierm@redhat.com>
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Date: Tue, 26 Nov 2019 09:51:41 +0100
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Subject: [PATCH] blscfg: add a space char when appending fields for variable
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expansion
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The GRUB variables are expanded and replaced by their values before adding
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menu entries, but they didn't include space characters after the values so
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the result was not correct.
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For the common case this wasn't a problem but it is if there are variables
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that are part of the values of other variables.
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Resolves: rhbz#1669252
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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---
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grub-core/commands/blscfg.c | 31 ++++++++++++++++++-------------
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1 file changed, 18 insertions(+), 13 deletions(-)
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diff --git a/grub-core/commands/blscfg.c b/grub-core/commands/blscfg.c
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index 11cc82b6f..c92e1c845 100644
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--- a/grub-core/commands/blscfg.c
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+++ b/grub-core/commands/blscfg.c
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@@ -597,26 +597,29 @@ static char **bls_make_list (struct bls_entry *entry, const char *key, int *num)
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static char *field_append(bool is_var, char *buffer, char *start, char *end)
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{
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- char *temp = grub_strndup(start, end - start + 1);
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- const char *field = temp;
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+ char *tmp = grub_strndup(start, end - start + 1);
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+ const char *field = tmp;
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+ int term = is_var ? 2 : 1;
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if (is_var) {
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- field = grub_env_get (temp);
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+ field = grub_env_get (tmp);
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if (!field)
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return buffer;
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}
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- if (!buffer) {
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- buffer = grub_strdup(field);
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- if (!buffer)
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- return NULL;
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- } else {
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- buffer = grub_realloc (buffer, grub_strlen(buffer) + grub_strlen(field));
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- if (!buffer)
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- return NULL;
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+ if (!buffer)
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+ buffer = grub_zalloc (grub_strlen(field) + term);
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+ else
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+ buffer = grub_realloc (buffer, grub_strlen(buffer) + grub_strlen(field) + term);
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- grub_stpcpy (buffer + grub_strlen(buffer), field);
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- }
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+ if (!buffer)
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+ return NULL;
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+
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+ tmp = buffer + grub_strlen(buffer);
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+ tmp = grub_stpcpy (tmp, field);
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+
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+ if (is_var)
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+ tmp = grub_stpcpy (tmp, " ");
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return buffer;
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}
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@@ -646,6 +649,8 @@ static char *expand_val(char *value)
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buffer = field_append(is_var, buffer, start, end);
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is_var = false;
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start = value;
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+ if (*start == ' ')
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+ start++;
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}
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}
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