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14d260f94f
linux/drivers/cpufreq
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Fabien Parent 14d260f94f cpufreq: qcom: fix writes in read-only memory region 
commit 01039fb8e9 upstream.

This commit fixes a kernel oops because of a write in some read-only memory:

	[    9.068287] Unable to handle kernel write to read-only memory at virtual address ffff800009240ad8
	..snip..
	[    9.138790] Internal error: Oops: 9600004f [#1] PREEMPT SMP
	..snip..
	[    9.269161] Call trace:
	[    9.276271]  __memcpy+0x5c/0x230
	[    9.278531]  snprintf+0x58/0x80
	[    9.282002]  qcom_cpufreq_msm8939_name_version+0xb4/0x190
	[    9.284869]  qcom_cpufreq_probe+0xc8/0x39c
	..snip..

The following line defines a pointer that point to a char buffer stored
in read-only memory:

	char *pvs_name = "speedXX-pvsXX-vXX";

This pointer is meant to hold a template "speedXX-pvsXX-vXX" where the
XX values get overridden by the qcom_cpufreq_krait_name_version function. Since
the template is actually stored in read-only memory, when the function
executes the following call we get an oops:

	snprintf(*pvs_name, sizeof("speedXX-pvsXX-vXX"), "speed%d-pvs%d-v%d",
		 speed, pvs, pvs_ver);

To fix this issue, we instead store the template name onto the stack by
using the following syntax:

	char pvs_name_buffer[] = "speedXX-pvsXX-vXX";

Because the `pvs_name` needs to be able to be assigned to NULL, the
template buffer is stored in the pvs_name_buffer and not under the
pvs_name variable.

Cc: v5.7+ <stable@vger.kernel.org> # v5.7+
Fixes: a8811ec764 ("cpufreq: qcom: Add support for krait based socs")
Signed-off-by: Fabien Parent <fabien.parent@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-10-29 10:12:54 +02:00
..
acpi-cpufreq.c cpufreq: acpi: Remove acpi_cpufreq_cpu_ready() 2021-09-02 18:04:17 +02:00
amd_freq_sensitivity.c cpufreq: amd_freq_sensitivity: Mark sometimes used ID structs as __maybe_unused 2020-07-15 15:17:06 +02:00
armada-8k-cpufreq.c cpufreq: ap806: Add missing MODULE_DEVICE_TABLE 2020-12-07 13:02:37 +05:30
armada-37xx-cpufreq.c cpufreq: armada-37xx: forbid cpufreq for 1.2 GHz variant 2021-08-09 09:31:22 +05:30
bmips-cpufreq.c cpufreq: Make cpufreq_generic_init() return void 2019-07-16 10:20:11 +02:00
brcmstb-avs-cpufreq.c cpufreq: brcmstb-avs-cpufreq: Fix resource leaks in ->remove() 2021-01-18 12:23:43 +05:30
cppc_cpufreq.c cpufreq: CPPC: Fix performance/frequency conversion 2022-04-13 20:59:11 +02:00
cpufreq_conservative.c cpufreq: Register governors at core_initcall 2020-07-02 13:03:30 +02:00
cpufreq_governor_attr_set.c cpufreq: schedutil: Destroy mutex before kobject_put() frees the memory 2021-09-14 19:01:36 +02:00
cpufreq_governor.c cpufreq: cpufreq_governor: Demote store_sampling_rate() header to standard comment block 2020-07-15 15:17:06 +02:00
cpufreq_governor.h cpufreq: Introduce governor flags 2020-11-10 18:31:17 +01:00
cpufreq_ondemand.c cpufreq: Replace deprecated CPU-hotplug functions 2021-08-04 20:16:32 +02:00
cpufreq_ondemand.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cpufreq_performance.c cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET 2020-11-10 18:31:17 +01:00
cpufreq_powersave.c cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET 2020-11-10 18:31:17 +01:00
cpufreq_stats.c cpufreq: stats: Clean up local variable in cpufreq_stats_create_table() 2021-06-07 13:47:57 +02:00
cpufreq_userspace.c cpufreq: Register governors at core_initcall 2020-07-02 13:03:30 +02:00
cpufreq-dt-platdev.c cpufreq: blocklist more Qualcomm platforms in cpufreq-dt-platdev 2021-08-30 10:43:35 +05:30
cpufreq-dt.c cpufreq: dt: Use .register_em() to register with energy model 2021-08-12 09:54:07 +05:30
cpufreq-dt.h cpufreq: dt: Allow platform specific intermediate callbacks 2020-03-12 15:43:52 +05:30
cpufreq-nforce2.c cpufreq: Avoid creating excessively large stack frames 2020-01-27 10:33:33 +01:00
cpufreq.c cpufreq: check only freq_table in __resolve_freq() 2022-09-15 11:30:01 +02:00
davinci-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
e_powersaver.c cpufreq: e_powersaver: remove unreachable break 2020-10-27 18:42:54 +01:00
elanfreq.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
freq_table.c cpufreq: Fix scaling_{available,boost}_frequencies_show() comments 2021-03-26 17:43:48 +01:00
gx-suspmod.c cpufreq: Avoid creating excessively large stack frames 2020-01-27 10:33:33 +01:00
highbank-cpufreq.c cpufreq: highbank: Add missing MODULE_DEVICE_TABLE 2020-12-07 13:02:37 +05:30
ia64-acpi-cpufreq.c ia64: fix format string for ia64-acpi-cpu-freq 2021-03-19 17:26:20 +01:00
imx6q-cpufreq.c cpufreq: imx6q: Use .register_em() to register with energy model 2021-08-12 09:54:07 +05:30
imx-cpufreq-dt.c cpufreq: imx-cpufreq-dt: support i.MX7ULP 2020-04-28 14:26:20 +05:30
intel_pstate.c cpufreq: intel_pstate: Add Tigerlake support in no-HWP mode 2022-10-26 12:35:30 +02:00
Kconfig cpufreq: Kconfig: fix documentation links 2021-04-21 19:00:42 +02:00
Kconfig.arm cpufreq: mediatek-hw: Add support for CPUFREQ HW 2021-09-06 15:15:19 +05:30
Kconfig.powerpc cpufreq: Fix Kconfig indentation 2019-11-29 11:52:02 +01:00
Kconfig.x86 cpufreq: sfi-cpufreq: Remove driver for deprecated firmware 2021-02-15 20:04:46 +01:00
kirkwood-cpufreq.c cpufreq: kirkwood: convert to devm_platform_ioremap_resource 2020-01-07 13:29:58 +05:30
longhaul.c cpufreq: Fix fall-through warning for Clang 2021-07-13 11:53:07 -05:00
longhaul.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166 2019-05-30 11:26:39 -07:00
longrun.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
loongson1-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
loongson2_cpufreq.c cpufreq: loongson2: Remove unused linux/sched.h headers 2021-06-07 17:43:52 +02:00
Makefile cpufreq: mediatek-hw: Add support for CPUFREQ HW 2021-09-06 15:15:19 +05:30
maple-cpufreq.c Merge branch 'pm-cpufreq' 2019-07-18 09:49:30 +02:00
mediatek-cpufreq-hw.c cpufreq: mediatek-hw: Add support for CPUFREQ HW 2021-09-06 15:15:19 +05:30
mediatek-cpufreq.c cpufreq: mediatek: Unregister platform device on exit 2022-06-09 10:23:14 +02:00
mvebu-cpufreq.c
omap-cpufreq.c cpufreq: omap: Use .register_em() to register with energy model 2021-08-12 09:54:07 +05:30
p4-clockmod.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
pasemi-cpufreq.c cpufreq: pasemi: Include header file for {check,restore}_astate prototypes 2020-07-15 15:17:06 +02:00
pcc-cpufreq.c cpufreq: pcc-cpufreq: Mark sometimes used ID structs as __maybe_unused 2020-07-15 15:17:06 +02:00
pmac32-cpufreq.c cpufreq: pmac32-cpufreq: Fix refcount leak bug 2022-07-21 21:24:34 +02:00
pmac64-cpufreq.c Merge branch 'pm-cpufreq' 2019-07-18 09:49:30 +02:00
powernow-k6.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
powernow-k7.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
powernow-k7.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166 2019-05-30 11:26:39 -07:00
powernow-k8.c cpufreq: Replace deprecated CPU-hotplug functions 2021-08-04 20:16:32 +02:00
powernow-k8.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 347 2019-06-05 17:37:08 +02:00
powernv-cpufreq.c powerpc updates for 5.15 2021-09-03 11:22:50 -07:00
ppc_cbe_cpufreq_pervasive.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 153 2019-05-30 11:26:32 -07:00
ppc_cbe_cpufreq_pmi.c cpufreq: Use per-policy frequency QoS 2019-10-21 02:05:21 +02:00
ppc_cbe_cpufreq.c cpufreq: powerpc_cbe: Switch to QoS requests for freq limits 2019-08-26 10:02:01 +02:00
ppc_cbe_cpufreq.h cpufreq: powerpc_cbe: Switch to QoS requests for freq limits 2019-08-26 10:02:01 +02:00
pxa2xx-cpufreq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pxa3xx-cpufreq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
qcom-cpufreq-hw.c cpufreq: qcom-cpufreq-hw: Clear dcvs interrupts 2022-05-09 09:14:37 +02:00
qcom-cpufreq-nvmem.c cpufreq: qcom: fix writes in read-only memory region 2022-10-29 10:12:54 +02:00
qoriq-cpufreq.c drivers: cpufreq: Add missing of_node_put() in qoriq-cpufreq.c 2022-07-07 17:53:33 +02:00
raspberrypi-cpufreq.c cpufreq: add driver for Raspberry Pi 2019-06-13 08:58:22 +05:30
s3c24xx-cpufreq-debugfs.c ARM: s3c: remove cpufreq header dependencies 2020-08-20 17:52:05 +02:00
s3c24xx-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
s3c64xx-cpufreq.c cpufreq: s3c64xx: Remove pointless NULL check in s3c64xx_cpufreq_driver_init 2019-10-23 08:53:23 +05:30
s3c2410-cpufreq.c cpufreq: s3c24xx: move low-level clk reg access into platform code 2020-08-20 17:53:22 +02:00
s3c2412-cpufreq.c cpufreq: s3c24xx: move low-level clk reg access into platform code 2020-08-20 17:53:22 +02:00
s3c2416-cpufreq.c cpufreq: s3c: fix unbalances of cpufreq policy refcount 2020-01-07 13:31:01 +05:30
s3c2440-cpufreq.c cpufreq: s3c24xx: move low-level clk reg access into platform code 2020-08-20 17:53:22 +02:00
s5pv210-cpufreq.c cpufreq: Rudimentary typos fix in the file s5pv210-cpufreq.c 2021-03-22 08:55:41 +05:30
sa1100-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
sa1110-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
sc520_freq.c cpufreq: sc520_freq: add 'fallthrough' to one case 2021-05-21 18:52:13 +02:00
scmi-cpufreq.c cpufreq: scmi: Use .register_em() to register with energy model 2021-08-30 10:43:00 +05:30
scpi-cpufreq.c cpufreq: scpi: Use .register_em() to register with energy model 2021-08-30 10:42:45 +05:30
sh-cpufreq.c cpufreq: sh: Remove sh_cpufreq_cpu_ready() 2021-09-02 18:04:17 +02:00
sparc-us2e-cpufreq.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
sparc-us3-cpufreq.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
spear-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
speedstep-centrino.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
speedstep-ich.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
speedstep-lib.c cpufreq: speedstep: remove unneeded semicolon 2020-10-28 18:04:07 +01:00
speedstep-lib.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166 2019-05-30 11:26:39 -07:00
speedstep-smi.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
sti-cpufreq.c cpufreq: st: Add missing MODULE_DEVICE_TABLE 2020-12-07 13:02:37 +05:30
sun50i-cpufreq-nvmem.c cpufreq: fix memory leak in sun50i_cpufreq_nvmem_probe 2022-05-09 09:14:36 +02:00
tegra20-cpufreq.c cpufreq: tegra20: Use resource-managed API 2021-01-18 12:02:53 +05:30
tegra124-cpufreq.c cpufreq: tegra124: Add suspend and resume support 2019-10-29 13:25:29 +01:00
tegra186-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
tegra194-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
ti-cpufreq.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
vexpress-spc-cpufreq.c cpufreq: vexpress: Drop unused variable 2021-09-16 11:29:27 -07:00