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authorMarco Elver <elver@google.com>2021-04-08 12:36:00 +0200
committerPeter Zijlstra <peterz@infradead.org>2021-04-16 16:32:41 +0200
commitfb6cc127e0b6e629252cdd0f77d5a1f49db95b92 (patch)
treed87b4f9b27913150809daadbb6674929832762ba /kernel/signal.c
parent2e498d0a74e5b88a6689ae1b811f247f91ff188e (diff)
signal: Introduce TRAP_PERF si_code and si_perf to siginfo
Introduces the TRAP_PERF si_code, and associated siginfo_t field si_perf. These will be used by the perf event subsystem to send signals (if requested) to the task where an event occurred. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k Acked-by: Arnd Bergmann <arnd@arndb.de> # asm-generic Link: https://lkml.kernel.org/r/20210408103605.1676875-6-elver@google.com
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index ba4d1ef39a9e..f68351825e5e 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1199,6 +1199,7 @@ static inline bool has_si_pid_and_uid(struct kernel_siginfo *info)
case SIL_FAULT_MCEERR:
case SIL_FAULT_BNDERR:
case SIL_FAULT_PKUERR:
+ case SIL_PERF_EVENT:
case SIL_SYS:
ret = false;
break;
@@ -2531,6 +2532,7 @@ static void hide_si_addr_tag_bits(struct ksignal *ksig)
case SIL_FAULT_MCEERR:
case SIL_FAULT_BNDERR:
case SIL_FAULT_PKUERR:
+ case SIL_PERF_EVENT:
ksig->info.si_addr = arch_untagged_si_addr(
ksig->info.si_addr, ksig->sig, ksig->info.si_code);
break;
@@ -3333,6 +3335,10 @@ void copy_siginfo_to_external32(struct compat_siginfo *to,
#endif
to->si_pkey = from->si_pkey;
break;
+ case SIL_PERF_EVENT:
+ to->si_addr = ptr_to_compat(from->si_addr);
+ to->si_perf = from->si_perf;
+ break;
case SIL_CHLD:
to->si_pid = from->si_pid;
to->si_uid = from->si_uid;
@@ -3413,6 +3419,10 @@ static int post_copy_siginfo_from_user32(kernel_siginfo_t *to,
#endif
to->si_pkey = from->si_pkey;
break;
+ case SIL_PERF_EVENT:
+ to->si_addr = compat_ptr(from->si_addr);
+ to->si_perf = from->si_perf;
+ break;
case SIL_CHLD:
to->si_pid = from->si_pid;
to->si_uid = from->si_uid;
@@ -4593,6 +4603,7 @@ static inline void siginfo_buildtime_checks(void)
CHECK_OFFSET(si_lower);
CHECK_OFFSET(si_upper);
CHECK_OFFSET(si_pkey);
+ CHECK_OFFSET(si_perf);
/* sigpoll */
CHECK_OFFSET(si_band);

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