From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
Jarkko Sakkinen <jarkko@kernel.org>,
Sumit Garg <sumit.garg@linaro.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 5.10 35/39] static_call: Align static_call_is_init() patching condition
Date: Thu, 25 Mar 2021 07:25:54 -0400 [thread overview]
Message-ID: <20210325112558.1927423-35-sashal@kernel.org> (raw)
In-Reply-To: <20210325112558.1927423-1-sashal@kernel.org>
From: Peter Zijlstra <peterz@infradead.org>
[ Upstream commit 698bacefe993ad2922c9d3b1380591ad489355e9 ]
The intent is to avoid writing init code after init (because the text
might have been freed). The code is needlessly different between
jump_label and static_call and not obviously correct.
The existing code relies on the fact that the module loader clears the
init layout, such that within_module_init() always fails, while
jump_label relies on the module state which is more obvious and
matches the kernel logic.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Tested-by: Sumit Garg <sumit.garg@linaro.org>
Link: https://lkml.kernel.org/r/20210318113610.636651340@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/static_call.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)
diff --git a/kernel/static_call.c b/kernel/static_call.c
index 84565c2a41b8..781ff0fd031d 100644
--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -144,6 +144,7 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func)
};
for (site_mod = &first; site_mod; site_mod = site_mod->next) {
+ bool init = system_state < SYSTEM_RUNNING;
struct module *mod = site_mod->mod;
if (!site_mod->sites) {
@@ -163,6 +164,7 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func)
if (mod) {
stop = mod->static_call_sites +
mod->num_static_call_sites;
+ init = mod->state == MODULE_STATE_COMING;
}
#endif
@@ -170,16 +172,8 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func)
site < stop && static_call_key(site) == key; site++) {
void *site_addr = static_call_addr(site);
- if (static_call_is_init(site)) {
- /*
- * Don't write to call sites which were in
- * initmem and have since been freed.
- */
- if (!mod && system_state >= SYSTEM_RUNNING)
- continue;
- if (mod && !within_module_init((unsigned long)site_addr, mod))
- continue;
- }
+ if (!init && static_call_is_init(site))
+ continue;
if (!kernel_text_address((unsigned long)site_addr)) {
WARN_ONCE(1, "can't patch static call site at %pS",
--
2.30.1
next prev parent reply other threads:[~2021-03-25 11:31 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 11:25 [PATCH AUTOSEL 5.10 01/39] virtiofs: Fail dax mount if device does not support it Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 02/39] ext4: shrink race window in ext4_should_retry_alloc() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 03/39] ext4: add reclaim checks to xattr code Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 04/39] fs/ext4: fix integer overflow in s_log_groups_per_flex Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 05/39] ext4: fix bh ref count on error paths Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 06/39] fs: nfsd: fix kconfig dependency warning for NFSD_V4 Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 07/39] rpc: fix NULL dereference on kmalloc failure Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 08/39] iomap: Fix negative assignment to unsigned sis->pages in iomap_swapfile_activate Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 09/39] ASoC: rt1015: fix i2c communication error Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 10/39] ASoC: rt5640: Fix dac- and adc- vol-tlv values being off by a factor of 10 Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 11/39] ASoC: rt5651: " Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 12/39] ASoC: sgtl5000: set DAP_AVC_CTRL register to correct default value on probe Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 13/39] ASoC: es8316: Simplify adc_pga_gain_tlv table Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 14/39] ASoC: soc-core: Prevent warning if no DMI table is present Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 15/39] ASoC: cs42l42: Fix Bitclock polarity inversion Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 16/39] ASoC: cs42l42: Fix channel width support Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 17/39] ASoC: cs42l42: Fix mixer volume control Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 18/39] ASoC: cs42l42: Always wait at least 3ms after reset Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 19/39] NFSD: fix error handling in NFSv4.0 callbacks Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 20/39] kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 21/39] powerpc: Force inlining of cpu_has_feature() to avoid build failure Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 22/39] vhost: Fix vhost_vq_reset() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 23/39] io_uring: fix ->flags races by linked timeouts Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 24/39] scsi: st: Fix a use after free in st_open() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 25/39] scsi: qla2xxx: Fix broken #endif placement Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 26/39] staging: comedi: cb_pcidas: fix request_irq() warn Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 27/39] staging: comedi: cb_pcidas64: " Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 28/39] ASoC: rt5659: Update MCLK rate in set_sysclk() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 29/39] ASoC: rt711: add snd_soc_component remove callback Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 30/39] thermal/core: Add NULL pointer check before using cooling device stats Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 31/39] locking/ww_mutex: Simplify use_ww_ctx & ww_ctx handling Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 32/39] locking/ww_mutex: Fix acquire/release imbalance in ww_acquire_init()/ww_acquire_fini() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 33/39] nvmet-tcp: fix kmap leak when data digest in use Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 34/39] io_uring: imply MSG_NOSIGNAL for send[msg]()/recv[msg]() calls Sasha Levin
2021-03-25 11:25 ` Sasha Levin [this message]
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 36/39] ext4: do not iput inode under running transaction in ext4_rename() Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 37/39] signal: don't allow sending any signals to PF_IO_WORKER threads Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 38/39] signal: don't allow STOP on " Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 39/39] io_uring: call req_set_fail_links() on short send[msg]()/recv[msg]() with MSG_WAITALL Sasha Levin
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