Bug 2278624
| Summary: | SELinux is preventing wine-preloader from using the 'execheap' accesses on a process. | ||||||||
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| Product: | [Fedora] Fedora | Reporter: | Kamil Páral <kparal> | ||||||
| Component: | selinux-policy | Assignee: | Zdenek Pytela <zpytela> | ||||||
| Status: | CLOSED DUPLICATE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||
| Severity: | unspecified | Docs Contact: | |||||||
| Priority: | unspecified | ||||||||
| Version: | 40 | CC: | dwalsh, knazekovan, kparal, lvrabec, mmalik, omosnacek, pkoncity, vmojzis, zpytela | ||||||
| Target Milestone: | --- | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | x86_64 | ||||||||
| OS: | Unspecified | ||||||||
| Whiteboard: | abrt_hash:1cb53da229f699b9195cecf3fc3781125cbc9c2d82b66b66d818e35e88df6389;VARIANT_ID=workstation; | ||||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2024-05-03 07:24:13 UTC | Type: | --- | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Embargoed: | |||||||||
| Attachments: |
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Created attachment 2030871 [details]
File: description
Created attachment 2030872 [details]
File: os_info
The Linux implementation of mprotect (unlike POSIX) allows changing the access protection of memory on the heap, e. g. allocated using malloc. This AVC denial indicates that heap memory was supposed to be made executable. While the permission can be granted turning the selinuxuser_execheap boolean on as suggested by setroubleshoot, it should not be done without a thorough code review as in most cases it indicates a bug in the code and you should consider reporting a bug on the related component. If anonymous executable memory is needed, another method should be considered, e. g. allocating memory using mmap. Please refer to the boolean description: # semanage boolean -l|grep execheap selinuxuser_execheap (off , off) Allow unconfined executables to make their heap memory executable. Doing this is a really bad idea. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla If there is no other information, I will close this bz. Thanks. This seems to be a duplicate of bug 2247299, isn't it? *** This bug has been marked as a duplicate of bug 2247299 *** |
Description of problem: This popped up after starting Steam (Flatpak version) and hitting the Download Update button inside it. SELinux is preventing wine-preloader from using the 'execheap' accesses on a process. ***** Plugin allow_execheap (53.1 confidence) suggests ******************** If you do not think wine-preloader should need to map heap memory that is both writable and executable. Then you need to report a bug. This is a potentially dangerous access. Do contact your security administrator and report this issue. ***** Plugin catchall_boolean (42.6 confidence) suggests ****************** If you want to allow selinuxuser to execheap Then you must tell SELinux about this by enabling the 'selinuxuser_execheap' boolean. Do setsebool -P selinuxuser_execheap 1 ***** Plugin catchall (5.76 confidence) suggests ************************** If you believe that wine-preloader should be allowed execheap access on processes labeled unconfined_t by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing: # ausearch -c 'wine-preloader' --raw | audit2allow -M my-winepreloader # semodule -X 300 -i my-winepreloader.pp Additional Information: Source Context unconfined_u:unconfined_r:unconfined_t:s0- s0:c0.c1023 Target Context unconfined_u:unconfined_r:unconfined_t:s0- s0:c0.c1023 Target Objects Unknown [ process ] Source wine-preloader Source Path wine-preloader Port <Unknown> Host (removed) Source RPM Packages Target RPM Packages SELinux Policy RPM selinux-policy-targeted-40.17-1.fc40.noarch Local Policy RPM selinux-policy-targeted-40.17-1.fc40.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name (removed) Platform Linux (removed) 6.8.8-300.fc40.x86_64 #1 SMP PREEMPT_DYNAMIC Sat Apr 27 17:53:31 UTC 2024 x86_64 Alert Count 1 First Seen 2024-05-02 15:02:48 CEST Last Seen 2024-05-02 15:02:48 CEST Local ID 1c952af1-6b0b-4941-95b6-ebc8f156e0f6 Raw Audit Messages type=AVC msg=audit(1714654968.610:1287): avc: denied { execheap } for pid=188884 comm="wine-preloader" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process permissive=0 Hash: wine-preloader,unconfined_t,unconfined_t,process,execheap Version-Release number of selected component: selinux-policy-targeted-40.17-1.fc40.noarch Additional info: reporter: libreport-2.17.15 reason: SELinux is preventing wine-preloader from using the 'execheap' accesses on a process. package: selinux-policy-targeted-40.17-1.fc40.noarch component: selinux-policy hashmarkername: setroubleshoot type: libreport kernel: 6.8.8-300.fc40.x86_64 comment: This popped up after starting Steam (Flatpak version) and hitting the Download Update button inside it. component: selinux-policy