From: Shiju Jose <[email protected]>
ghes_handle_aer() passes AER data to the PCI core for logging and
recovery by calling aer_recover_queue() with a pointer to struct
aer_capability_regs.
The problem was that aer_recover_queue() queues the pointer directly
without copying the aer_capability_regs data. The pointer was to
the ghes->estatus buffer, which could be reused before
aer_recover_work_func() reads the data.
To avoid this problem, allocate a new aer_capability_regs structure
from the ghes_estatus_pool, copy the AER data from the ghes->estatus
buffer into it, pass a pointer to the new struct to
aer_recover_queue(), and free it after aer_recover_work_func() has
processed it.
Reported-by: Bjorn Helgaas <[email protected]>
Acked-by: Bjorn Helgaas <[email protected]>
Signed-off-by: Shiju Jose <[email protected]>
---
Changes from v1 to v2:
1. Updated patch description with the description Bjorn has suggested.
2. Add Acked-by: Bjorn Helgaas <[email protected]>.
---
drivers/acpi/apei/ghes.c | 23 ++++++++++++++++++++++-
drivers/pci/pcie/aer.c | 10 ++++++++++
include/acpi/ghes.h | 1 +
3 files changed, 33 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index ef59d6ea16da..63ad0541db38 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -209,6 +209,20 @@ int ghes_estatus_pool_init(unsigned int num_ghes)
return -ENOMEM;
}
+/**
+ * ghes_estatus_pool_region_free - free previously allocated memory
+ * from the ghes_estatus_pool.
+ * @addr: address of memory to free.
+ * @size: size of memory to free.
+ *
+ * Returns none.
+ */
+void ghes_estatus_pool_region_free(unsigned long addr, u32 size)
+{
+ gen_pool_free(ghes_estatus_pool, addr, size);
+}
+EXPORT_SYMBOL_GPL(ghes_estatus_pool_region_free);
+
static int map_gen_v2(struct ghes *ghes)
{
return apei_map_generic_address(&ghes->generic_v2->read_ack_register);
@@ -564,6 +578,7 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
unsigned int devfn;
int aer_severity;
+ u8 *aer_info;
devfn = PCI_DEVFN(pcie_err->device_id.device,
pcie_err->device_id.function);
@@ -577,11 +592,17 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
if (gdata->flags & CPER_SEC_RESET)
aer_severity = AER_FATAL;
+ aer_info = (void *)gen_pool_alloc(ghes_estatus_pool,
+ sizeof(struct aer_capability_regs));
+ if (!aer_info)
+ return;
+ memcpy(aer_info, pcie_err->aer_info, sizeof(struct aer_capability_regs));
+
aer_recover_queue(pcie_err->device_id.segment,
pcie_err->device_id.bus,
devfn, aer_severity,
(struct aer_capability_regs *)
- pcie_err->aer_info);
+ aer_info);
}
#endif
}
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index e85ff946e8c8..388b614c11fd 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -29,6 +29,7 @@
#include <linux/kfifo.h>
#include <linux/slab.h>
#include <acpi/apei.h>
+#include <acpi/ghes.h>
#include <ras/ras_event.h>
#include "../pci.h"
@@ -996,6 +997,15 @@ static void aer_recover_work_func(struct work_struct *work)
continue;
}
cper_print_aer(pdev, entry.severity, entry.regs);
+ /*
+ * Memory for aer_capability_regs(entry.regs) is being allocated from the
+ * ghes_estatus_pool to protect it from overwriting when multiple sections
+ * are present in the error status. Thus free the same after processing
+ * the data.
+ */
+ ghes_estatus_pool_region_free((unsigned long)entry.regs,
+ sizeof(struct aer_capability_regs));
+
if (entry.severity == AER_NONFATAL)
pcie_do_recovery(pdev, pci_channel_io_normal,
aer_root_reset);
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 3c8bba9f1114..40d89e161076 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -78,6 +78,7 @@ static inline struct list_head *ghes_get_devices(void) { return NULL; }
#endif
int ghes_estatus_pool_init(unsigned int num_ghes);
+void ghes_estatus_pool_region_free(unsigned long addr, u32 size);
static inline int acpi_hest_get_version(struct acpi_hest_generic_data *gdata)
{
--
2.34.1
Hi,
kernel test robot noticed the following build errors:
[auto build test ERROR on rafael-pm/linux-next]
[also build test ERROR on pci/next pci/for-linus linus/master v6.6-rc2 next-20230919]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/shiju-jose-huawei-com/ACPI-APEI-Fix-for-overwriting-AER-info-when-error-status-data-has-multiple-sections/20230919-171718
base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link: https://lore.kernel.org/r/20230919091543.794-1-shiju.jose%40huawei.com
patch subject: [PATCH v2 1/1] ACPI / APEI: Fix for overwriting AER info when error status data has multiple sections
config: i386-buildonly-randconfig-006-20230920 (https://download.01.org/0day-ci/archive/20230920/[email protected]/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230920/[email protected]/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
All errors (new ones prefixed by >>):
ld: drivers/pci/pcie/aer.o: in function `aer_recover_work_func':
>> aer.c:(.text+0xec5): undefined reference to `ghes_estatus_pool_region_free'
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
On Tue, Sep 19, 2023 at 11:16 AM <[email protected]> wrote:
>
> From: Shiju Jose <[email protected]>
>
> ghes_handle_aer() passes AER data to the PCI core for logging and
> recovery by calling aer_recover_queue() with a pointer to struct
> aer_capability_regs.
>
> The problem was that aer_recover_queue() queues the pointer directly
> without copying the aer_capability_regs data. The pointer was to
> the ghes->estatus buffer, which could be reused before
> aer_recover_work_func() reads the data.
>
> To avoid this problem, allocate a new aer_capability_regs structure
> from the ghes_estatus_pool, copy the AER data from the ghes->estatus
> buffer into it, pass a pointer to the new struct to
> aer_recover_queue(), and free it after aer_recover_work_func() has
> processed it.
>
> Reported-by: Bjorn Helgaas <[email protected]>
> Acked-by: Bjorn Helgaas <[email protected]>
> Signed-off-by: Shiju Jose <[email protected]>
> ---
> Changes from v1 to v2:
> 1. Updated patch description with the description Bjorn has suggested.
> 2. Add Acked-by: Bjorn Helgaas <[email protected]>.
> ---
> drivers/acpi/apei/ghes.c | 23 ++++++++++++++++++++++-
> drivers/pci/pcie/aer.c | 10 ++++++++++
> include/acpi/ghes.h | 1 +
> 3 files changed, 33 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index ef59d6ea16da..63ad0541db38 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -209,6 +209,20 @@ int ghes_estatus_pool_init(unsigned int num_ghes)
> return -ENOMEM;
> }
>
> +/**
> + * ghes_estatus_pool_region_free - free previously allocated memory
> + * from the ghes_estatus_pool.
> + * @addr: address of memory to free.
> + * @size: size of memory to free.
> + *
> + * Returns none.
> + */
> +void ghes_estatus_pool_region_free(unsigned long addr, u32 size)
> +{
> + gen_pool_free(ghes_estatus_pool, addr, size);
> +}
> +EXPORT_SYMBOL_GPL(ghes_estatus_pool_region_free);
> +
> static int map_gen_v2(struct ghes *ghes)
> {
> return apei_map_generic_address(&ghes->generic_v2->read_ack_register);
> @@ -564,6 +578,7 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
> pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
> unsigned int devfn;
> int aer_severity;
> + u8 *aer_info;
>
> devfn = PCI_DEVFN(pcie_err->device_id.device,
> pcie_err->device_id.function);
> @@ -577,11 +592,17 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
> if (gdata->flags & CPER_SEC_RESET)
> aer_severity = AER_FATAL;
>
> + aer_info = (void *)gen_pool_alloc(ghes_estatus_pool,
> + sizeof(struct aer_capability_regs));
> + if (!aer_info)
> + return;
> + memcpy(aer_info, pcie_err->aer_info, sizeof(struct aer_capability_regs));
> +
> aer_recover_queue(pcie_err->device_id.segment,
> pcie_err->device_id.bus,
> devfn, aer_severity,
> (struct aer_capability_regs *)
> - pcie_err->aer_info);
> + aer_info);
> }
> #endif
> }
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index e85ff946e8c8..388b614c11fd 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -29,6 +29,7 @@
> #include <linux/kfifo.h>
> #include <linux/slab.h>
> #include <acpi/apei.h>
> +#include <acpi/ghes.h>
> #include <ras/ras_event.h>
>
> #include "../pci.h"
> @@ -996,6 +997,15 @@ static void aer_recover_work_func(struct work_struct *work)
> continue;
> }
> cper_print_aer(pdev, entry.severity, entry.regs);
> + /*
> + * Memory for aer_capability_regs(entry.regs) is being allocated from the
> + * ghes_estatus_pool to protect it from overwriting when multiple sections
> + * are present in the error status. Thus free the same after processing
> + * the data.
> + */
> + ghes_estatus_pool_region_free((unsigned long)entry.regs,
> + sizeof(struct aer_capability_regs));
> +
> if (entry.severity == AER_NONFATAL)
> pcie_do_recovery(pdev, pci_channel_io_normal,
> aer_root_reset);
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 3c8bba9f1114..40d89e161076 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -78,6 +78,7 @@ static inline struct list_head *ghes_get_devices(void) { return NULL; }
> #endif
>
> int ghes_estatus_pool_init(unsigned int num_ghes);
> +void ghes_estatus_pool_region_free(unsigned long addr, u32 size);
If I'm not mistaken, this needs to go under #ifdef
CONFIG_ACPI_APEI_GHES and it needs an empty stub for the case when
CONFIG_ACPI_APEI_GHES is not set.
>
> static inline int acpi_hest_get_version(struct acpi_hest_generic_data *gdata)
> {
> --
> 2.34.1
>
Hi Rafael,
>-----Original Message-----
>From: Rafael J. Wysocki <[email protected]>
>Sent: 20 September 2023 18:23
>To: Shiju Jose <[email protected]>
>Cc: [email protected]; [email protected]; [email protected];
>[email protected]; [email protected]; [email protected];
>[email protected]; [email protected]; [email protected];
>[email protected]; Linuxarm <[email protected]>; Jonathan
>Cameron <[email protected]>; tanxiaofei
><[email protected]>; Zengtao (B) <[email protected]>
>Subject: Re: [PATCH v2 1/1] ACPI / APEI: Fix for overwriting AER info when error
>status data has multiple sections
>
>On Tue, Sep 19, 2023 at 11:16 AM <[email protected]> wrote:
>>
>> From: Shiju Jose <[email protected]>
>>
>> ghes_handle_aer() passes AER data to the PCI core for logging and
>> recovery by calling aer_recover_queue() with a pointer to struct
>> aer_capability_regs.
>>
>> The problem was that aer_recover_queue() queues the pointer directly
>> without copying the aer_capability_regs data. The pointer was to the
>> ghes->estatus buffer, which could be reused before
>> aer_recover_work_func() reads the data.
>>
>> To avoid this problem, allocate a new aer_capability_regs structure
>> from the ghes_estatus_pool, copy the AER data from the ghes->estatus
>> buffer into it, pass a pointer to the new struct to
>> aer_recover_queue(), and free it after aer_recover_work_func() has
>> processed it.
>>
>> Reported-by: Bjorn Helgaas <[email protected]>
>> Acked-by: Bjorn Helgaas <[email protected]>
>> Signed-off-by: Shiju Jose <[email protected]>
>> ---
>> Changes from v1 to v2:
>> 1. Updated patch description with the description Bjorn has suggested.
>> 2. Add Acked-by: Bjorn Helgaas <[email protected]>.
>> ---
>> drivers/acpi/apei/ghes.c | 23 ++++++++++++++++++++++-
>> drivers/pci/pcie/aer.c | 10 ++++++++++
>> include/acpi/ghes.h | 1 +
>> 3 files changed, 33 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index
>> ef59d6ea16da..63ad0541db38 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -209,6 +209,20 @@ int ghes_estatus_pool_init(unsigned int num_ghes)
>> return -ENOMEM;
>> }
>>
>> +/**
>> + * ghes_estatus_pool_region_free - free previously allocated memory
>> + * from the ghes_estatus_pool.
>> + * @addr: address of memory to free.
>> + * @size: size of memory to free.
>> + *
>> + * Returns none.
>> + */
>> +void ghes_estatus_pool_region_free(unsigned long addr, u32 size) {
>> + gen_pool_free(ghes_estatus_pool, addr, size); }
>> +EXPORT_SYMBOL_GPL(ghes_estatus_pool_region_free);
>> +
>> static int map_gen_v2(struct ghes *ghes) {
>> return
>> apei_map_generic_address(&ghes->generic_v2->read_ack_register);
>> @@ -564,6 +578,7 @@ static void ghes_handle_aer(struct
>acpi_hest_generic_data *gdata)
>> pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
>> unsigned int devfn;
>> int aer_severity;
>> + u8 *aer_info;
>>
>> devfn = PCI_DEVFN(pcie_err->device_id.device,
>> pcie_err->device_id.function); @@
>> -577,11 +592,17 @@ static void ghes_handle_aer(struct
>acpi_hest_generic_data *gdata)
>> if (gdata->flags & CPER_SEC_RESET)
>> aer_severity = AER_FATAL;
>>
>> + aer_info = (void *)gen_pool_alloc(ghes_estatus_pool,
>> + sizeof(struct aer_capability_regs));
>> + if (!aer_info)
>> + return;
>> + memcpy(aer_info, pcie_err->aer_info, sizeof(struct
>> + aer_capability_regs));
>> +
>> aer_recover_queue(pcie_err->device_id.segment,
>> pcie_err->device_id.bus,
>> devfn, aer_severity,
>> (struct aer_capability_regs *)
>> - pcie_err->aer_info);
>> + aer_info);
>> }
>> #endif
>> }
>> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index
>> e85ff946e8c8..388b614c11fd 100644
>> --- a/drivers/pci/pcie/aer.c
>> +++ b/drivers/pci/pcie/aer.c
>> @@ -29,6 +29,7 @@
>> #include <linux/kfifo.h>
>> #include <linux/slab.h>
>> #include <acpi/apei.h>
>> +#include <acpi/ghes.h>
>> #include <ras/ras_event.h>
>>
>> #include "../pci.h"
>> @@ -996,6 +997,15 @@ static void aer_recover_work_func(struct work_struct
>*work)
>> continue;
>> }
>> cper_print_aer(pdev, entry.severity, entry.regs);
>> + /*
>> + * Memory for aer_capability_regs(entry.regs) is being allocated
>from the
>> + * ghes_estatus_pool to protect it from overwriting when multiple
>sections
>> + * are present in the error status. Thus free the same after
>processing
>> + * the data.
>> + */
>> + ghes_estatus_pool_region_free((unsigned long)entry.regs,
>> + sizeof(struct
>> + aer_capability_regs));
>> +
>> if (entry.severity == AER_NONFATAL)
>> pcie_do_recovery(pdev, pci_channel_io_normal,
>> aer_root_reset); diff --git
>> a/include/acpi/ghes.h b/include/acpi/ghes.h index
>> 3c8bba9f1114..40d89e161076 100644
>> --- a/include/acpi/ghes.h
>> +++ b/include/acpi/ghes.h
>> @@ -78,6 +78,7 @@ static inline struct list_head
>> *ghes_get_devices(void) { return NULL; } #endif
>>
>> int ghes_estatus_pool_init(unsigned int num_ghes);
>> +void ghes_estatus_pool_region_free(unsigned long addr, u32 size);
>
>If I'm not mistaken, this needs to go under #ifdef CONFIG_ACPI_APEI_GHES and
>it needs an empty stub for the case when CONFIG_ACPI_APEI_GHES is not set.
Thanks. You are right. It was fixed and is under build check for i386 and aarch64,
testing etc.
I will post the updated patch soon.
>
>>
>> static inline int acpi_hest_get_version(struct acpi_hest_generic_data
>> *gdata) {
>> --
>> 2.34.1
>>
Thanks,
Shiju