URL:
<http://savannah.gnu.org/bugs/?29253>
Summary: Memory corruption error when backslash line
continuation used in function call
Project: make
Submitted by: None
Submitted on: Thu 18 Mar 2010 08:26:54 AM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 3.81
Operating System: Any
Fixed Release: None
Triage Status: None
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Details:
I ran into some weird behaviour, and with the help of valgrind, tracked it to
a misuse of strcpy in the code which elides backslash-newline sequences inside
function calls.
The problem is that strcpy explicitly does not support being called with a
source and destination that overlap, but make does this. This didn't cause a
problem for me on Linux i386, but corrupted the command string on Linux amd64
for me. I suspect that libc is able to use a wider block-at-a-time primitive
to implement strcpy on amd64 than i386.
The fix is simple, just convert the strcpy call to a bcopy call:
--- make-dfsg-3.81.orig/job.c
+++ make-dfsg-3.81/job.c
@@ -1594,7 +1594,7 @@
/* There are no more references in this line to worry about.
Copy the remaining uninteresting text to the output. */
if (out != in)
- strcpy (out, in);
+ bcopy (in, out, strlen (in) + 1);
/* Finally, expand the line. */
lines[i] = allocated_variable_expand_for_file
(cmds->command_lines[i],
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