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kcov: move thread attach from open to start

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The current kcov code attaches a kcov object to the thread which opened
it. This is not desirable, as syzkaller opens /dev/kcov in a parent
process and passes it down to the child.

Move the thread attachment from open() time to start time.
This commit is contained in:
Matheus
2026-10-08 14:41:34 -03:00
parent d999ab7de2
commit 9a9740469f
4 changed files with 46 additions and 53 deletions
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kernel-src/include/kernel/kcov.h
+3 -3
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@@ -22,7 +22,7 @@
#define KCOV_CMP_FLAGS_64BIT 6
typedef struct {
unsigned int mode;
unsigned int mode; // transitions protected by mutex
mutex_t mapping_mutex;
unsigned int entry_count; // protected by mutex
uint64_t *buffer; // pointer protected by mutex
@@ -34,8 +34,8 @@ typedef struct {
void kcov_publish_pc(uint64_t pc);
void kcov_publish_cmp(uint64_t pc, uint64_t v1, uint64_t v2, uint64_t flags);
int kcov_set_buffer_size(unsigned int entry_count);
int kcov_set_mode(unsigned int mode);
int kcov_set_buffer_size(kcov_t *kcov, unsigned int entry_count);
int kcov_set_mode(kcov_t *kcov, unsigned int mode);
void kcov_hold(kcov_t *kcov);
void kcov_release(kcov_t *kcov);
void kcov_free_buffer(kcov_t *kcov);