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security: add per-client stream limit in PulseAudio protocol

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There was no limit on the number of streams a single client could
create. Each stream allocates a 4MB ring buffer, allowing a malicious
client to exhaust server memory. Add a configurable pulse.max-streams
property (default 64) to limit streams per client.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Wim Taymans 2026-04-29 16:28:05 +02:00
parent 80ec1f1d10
commit 37990b5e90
7 changed files with 18 additions and 1 deletions
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3
src/modules/module-protocol-pulse/defs.h
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@ -39,6 +39,9 @@
#define SCACHE_ENTRY_SIZE_MAX (1024*1024*16)
#define MAX_CLIENTS 64u
#define MAX_STREAMS 64u
#define MODULE_INDEX_MASK 0xfffffffu
#define MODULE_FLAG (1u << 29)