URL:
<https://savannah.gnu.org/bugs/?59870>
Summary: Segmentation Fault on GNU
Project: make
Submitted by: fabse333
Submitted on: Thu 14 Jan 2021 09:45:21 AM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: SCM
Operating System: POSIX-Based
Fixed Release: None
Triage Status: None
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Details:
The attached makefile will cause a Segmentation fault on GNU make 4.2 on
Debian and also when building the newest newest version from the GitHub
mirror.
The issue is that in the method "record_target_var" in read.c, the function
"assign_variable_definition" (see
https://github.com/mirror/make/blob/4.2/read.c#L1864 ) returns 0 on this
MAKEFILE. Even when the Comment states "I don't think this can fail,...". ;-)
While this return value is checked with an assert statement, the asserts are
not included on release builds (e.g. the one I have installed on my Debian 10
Buster). Assert can also be disabled by setting the DNDEBUG Cflag on the
./configure command for local testing:
./configure CFLAGS="-g -DNDEBUG"
The segmentation fault is then an exception when this instruction is executed
where RDX is set to 0:
movzx eax, byte ptr [rdx + 0x2f]
This should correspond to this line where the origin field of v is accessed:
https://github.com/mirror/make/blob/4.2/read.c#L1867
Steps to reproduce:
* make -f MAKEFILE
I don't see any security concerns related with this bug, so I set Privacy of
this ticket to Public.
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File Attachments:
-------------------------------------------------------
Date: Thu 14 Jan 2021 09:45:21 AM UTC Name: MAKEFILE Size: 8B By: fabse333
<http://savannah.gnu.org/bugs/download.php?file_id=50714>
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