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trace/policy: fix event size in log_output

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Returning 0 for max_event_size() can lead to writing out of buffer bounds.

Fixes genodelabs/genode#4435
This commit is contained in:
Johannes Schlatow
2022-02-22 10:00:26 +01:00
committed by Norman Feske
parent e95f0a409d
commit d24552f5e2
1 changed files with 4 additions and 1 deletions
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5
repos/os/src/lib/trace/policy/log_output/policy.cc
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@ -3,13 +3,16 @@
using namespace Genode; using namespace Genode;
enum { MAX_EVENT_SIZE = 256 };
size_t max_event_size() size_t max_event_size()
{ {
return 0; return MAX_EVENT_SIZE;
} }
size_t log_output(char *dst, char const *log_message, size_t len) size_t log_output(char *dst, char const *log_message, size_t len)
{ {
len = min(len, MAX_EVENT_SIZE);
memcpy(dst, (void*)log_message, len); memcpy(dst, (void*)log_message, len);
return len; return len;
} }