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Check for recipe line count overflow before it overflows

Browse Source 
awk 'BEGIN {
       print "x:"
       for (i = 0; i < 65536; i++)
         printf "\techo %d\n", i}
    ' | make -f -

Outputs only "make: 'x' is up to date."  Larger values run only the
lines above 65536.  Reported by Paul Eggert <eggert@cs.ucla.edu>.

* src/commands.c (chop_commands): Check the line count before it has
a chance to overflow.  Use size_t for max count so it can't overflow.
Remove stray 'd' in diagnostic.
This commit is contained in:
Paul Smith 2022-10-09 17:17:18 -07:00
parent 2d943d3d2e
commit 9d24d41801
1 changed files with 30 additions and 34 deletions
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64
src/commands.c
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@ -322,14 +322,12 @@ set_file_variables (struct file *file, const char *stem)
void
chop_commands (struct commands *cmds)
{
unsigned int nlines;
unsigned short idx;
unsigned short nlines;
unsigned short i;
char **lines;
/* If we don't have any commands,
or we already parsed them, never mind. */
if (!cmds || cmds->command_lines != 0)
/* If we don't have any commands, or we already parsed them, never mind. */
if (!cmds || cmds->command_lines != NULL)
return;
/* Chop CMDS->commands up into lines in CMDS->command_lines. */
@ -348,25 +346,27 @@ chop_commands (struct commands *cmds)
}
else
{
const char *p;
const char *p = cmds->commands;
size_t max = 5;
nlines = 5;
lines = xmalloc (nlines * sizeof (char *));
idx = 0;
p = cmds->commands;
nlines = 0;
lines = xmalloc (max * sizeof (char *));
while (*p != '\0')
{
const char *end = p;
find_end:;
end = strchr (end, '\n');
if (end == 0)
if (end == NULL)
end = p + strlen (p);
else if (end > p && end[-1] == '\\')
{
int backslash = 1;
const char *b;
for (b = end - 2; b >= p && *b == '\\'; --b)
backslash = !backslash;
if (end > p + 1)
{
const char *b;
for (b = end - 2; b >= p && *b == '\\'; --b)
backslash = !backslash;
}
if (backslash)
{
++end;
@ -374,40 +374,36 @@ chop_commands (struct commands *cmds)
}
}
if (idx == nlines)
if (nlines == USHRT_MAX)
ON (fatal, &cmds->fileinfo,
_("Recipe has too many lines (limit %hu)"), nlines);
if (nlines == max)
{
nlines += 2;
lines = xrealloc (lines, nlines * sizeof (char *));
max += 2;
lines = xrealloc (lines, max * sizeof (char *));
}
lines[idx++] = xstrndup (p, (size_t) (end - p));
lines[nlines++] = xstrndup (p, (size_t) (end - p));
p = end;
if (*p != '\0')
++p;
}
if (idx != nlines)
{
nlines = idx;
lines = xrealloc (lines, nlines * sizeof (char *));
}
}
/* Finally, set the corresponding CMDS->lines_flags elements and the
CMDS->any_recurse flag. */
if (nlines > USHRT_MAX)
ON (fatal, &cmds->fileinfo, _("Recipe has too many lines (%ud)"), nlines);
cmds->ncommand_lines = (unsigned short)nlines;
cmds->ncommand_lines = nlines;
cmds->command_lines = lines;
cmds->any_recurse = 0;
cmds->lines_flags = xmalloc (nlines);
for (idx = 0; idx < nlines; ++idx)
for (i = 0; i < nlines; ++i)
{
unsigned char flags = 0;
const char *p = lines[idx];
const char *p = lines[i];
while (ISBLANK (*p) || *p == '-' || *p == '@' || *p == '+')
switch (*(p++))
@ -424,12 +420,12 @@ chop_commands (struct commands *cmds)
}
/* If no explicit '+' was given, look for MAKE variable references. */
if (!(flags & COMMANDS_RECURSE)
if (! ANY_SET (flags, COMMANDS_RECURSE)
&& (strstr (p, "$(MAKE)") != 0 || strstr (p, "${MAKE}") != 0))
flags |= COMMANDS_RECURSE;
cmds->lines_flags[idx] = flags;
cmds->any_recurse |= flags & COMMANDS_RECURSE ? 1 : 0;
cmds->lines_flags[i] = flags;
cmds->any_recurse |= ANY_SET (flags, COMMANDS_RECURSE) ? 1 : 0;
}
}