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Make ovs locking more robust in race condition scenarios

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This commit is contained in:
The Thor Group
-
parent 0065c89e10
commit 19f745a2ad
1 changed files with 10 additions and 0 deletions
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10
internal/override/override_symbol.c
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@ -201,11 +201,16 @@ static inline void prepare_trampoline(struct override_symbol_inst *sym)
*/
int __enable_symbol_override(struct override_symbol_inst *sym)
{
if (sym->mem_protected)
set_symbol_rw(sym);
WITH_OVS_LOCK(sym,
if (likely(!sym->installed)) {
if (!sym->has_trampoline)
prepare_trampoline(sym);
//after we got the lock need to re-check the memory protection - this shouldn't be changed within spinlock
//since it generates a warning... but sometimes we have no choice
if (sym->mem_protected)
set_symbol_rw(sym);
@ -228,8 +233,13 @@ int __enable_symbol_override(struct override_symbol_inst *sym)
*/
int __disable_symbol_override(struct override_symbol_inst *sym)
{
if (sym->mem_protected)
set_symbol_rw(sym);
WITH_OVS_LOCK(sym,
if (likely(sym->installed)) {
//after we got the lock need to re-check the memory protection - this shouldn't be changed within spinlock
//since it generates a warning... but sometimes we have no choice
if (sym->mem_protected)
set_symbol_rw(sym);