CVE-2022-50239

[    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 qcomcpufreqkraitnameversion 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 pvsnamebuffer and not under the pvs_name variable.

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

a8811ec764f95a04ba82f6f457e28c5e9e36e36b

Fixed

794ded0bc461287a268bed21fea2eebb6e5d232c

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

a8811ec764f95a04ba82f6f457e28c5e9e36e36b

Fixed

14d260f94ff89543597ffea13db8b277a810e08e

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

a8811ec764f95a04ba82f6f457e28c5e9e36e36b

Fixed

b74ee4e301ca01e431e240c046173332966e2431

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

a8811ec764f95a04ba82f6f457e28c5e9e36e36b

Fixed

01039fb8e90c9cb684430414bff70cea9eb168c5

Affected versions

v5.*

v5.10

v5.10-rc1

v5.10-rc2

v5.10-rc3

v5.10-rc4

v5.10-rc5

v5.10-rc6

v5.10-rc7

v5.10.1

v5.10.10

v5.10.100

v5.10.101

v5.10.102

v5.10.103

v5.10.104

v5.10.105

v5.10.106

v5.10.107

v5.10.108

v5.10.109

v5.10.11

v5.10.110

v5.10.111

v5.10.112

v5.10.113

v5.10.114

v5.10.115

v5.10.116

v5.10.117

v5.10.118

v5.10.119

v5.10.12

v5.10.120

v5.10.121

v5.10.122

v5.10.123

v5.10.124

v5.10.125

v5.10.126

v5.10.127

v5.10.128

v5.10.129

v5.10.13

v5.10.130

v5.10.131

v5.10.132

v5.10.133

v5.10.134

v5.10.135

v5.10.136

v5.10.137

v5.10.138

v5.10.139

v5.10.14

v5.10.140

v5.10.141

v5.10.142

v5.10.143

v5.10.144

v5.10.145

v5.10.146

v5.10.147

v5.10.148

v5.10.149

v5.10.15

v5.10.150

v5.10.151

v5.10.16

v5.10.17

v5.10.18

v5.10.19

v5.10.2

v5.10.20

v5.10.21

v5.10.22

v5.10.23

v5.10.24

v5.10.25

v5.10.26

v5.10.27

v5.10.28

v5.10.29

v5.10.3

v5.10.30

v5.10.31

v5.10.32

v5.10.33

v5.10.34

v5.10.35

v5.10.36

v5.10.37

v5.10.38

v5.10.39

v5.10.4

v5.10.40

v5.10.41

v5.10.42

v5.10.43

v5.10.44

v5.10.45

v5.10.46

v5.10.47

v5.10.48

v5.10.49

v5.10.5

v5.10.50

v5.10.51

v5.10.52

v5.10.53

v5.10.54

v5.10.55

v5.10.56

v5.10.57

v5.10.58

v5.10.59

v5.10.6

v5.10.60

v5.10.61

v5.10.62

v5.10.63

v5.10.64

v5.10.65

v5.10.66

v5.10.67

v5.10.68

v5.10.69

v5.10.7

v5.10.70

v5.10.71

v5.10.72

v5.10.73

v5.10.74

v5.10.75

v5.10.76

v5.10.77

v5.10.78

v5.10.79

v5.10.8

v5.10.80

v5.10.81

v5.10.82

v5.10.83

v5.10.84

v5.10.85

v5.10.86

v5.10.87

v5.10.88

v5.10.89

v5.10.9

v5.10.90

v5.10.91

v5.10.92

v5.10.93

v5.10.94

v5.10.95

v5.10.96

v5.10.97

v5.10.98

v5.10.99

v5.11

v5.11-rc1

v5.11-rc2

v5.11-rc3

v5.11-rc4

v5.11-rc5

v5.11-rc6

v5.11-rc7

v5.12

v5.12-rc1

v5.12-rc1-dontuse

v5.12-rc2

v5.12-rc3

v5.12-rc4

v5.12-rc5

v5.12-rc6

v5.12-rc7

v5.12-rc8

v5.13

v5.13-rc1

v5.13-rc2

v5.13-rc3

v5.13-rc4

v5.13-rc5

v5.13-rc6

v5.13-rc7

v5.14

v5.14-rc1

v5.14-rc2

v5.14-rc3

v5.14-rc4

v5.14-rc5

v5.14-rc6

v5.14-rc7

v5.15

v5.15-rc1

v5.15-rc2

v5.15-rc3

v5.15-rc4

v5.15-rc5

v5.15-rc6

v5.15-rc7

v5.15.1

v5.15.10

v5.15.11

v5.15.12

v5.15.13

v5.15.14

v5.15.15

v5.15.16

v5.15.17

v5.15.18

v5.15.19

v5.15.2

v5.15.20

v5.15.21

v5.15.22

v5.15.23

v5.15.24

v5.15.25

v5.15.26

v5.15.27

v5.15.28

v5.15.29

v5.15.3

v5.15.30

v5.15.31

v5.15.32

v5.15.33

v5.15.34

v5.15.35

v5.15.36

v5.15.37

v5.15.38

v5.15.39

v5.15.4

v5.15.40

v5.15.41

v5.15.42

v5.15.43

v5.15.44

v5.15.45

v5.15.46

v5.15.47

v5.15.48

v5.15.49

v5.15.5

v5.15.50

v5.15.51

v5.15.52

v5.15.53

v5.15.54

v5.15.55

v5.15.56

v5.15.57

v5.15.58

v5.15.59

v5.15.6

v5.15.60

v5.15.61

v5.15.62

v5.15.63

v5.15.64

v5.15.65

v5.15.66

v5.15.67

v5.15.68

v5.15.69

v5.15.7

v5.15.70

v5.15.71

v5.15.72

v5.15.73

v5.15.74

v5.15.75

v5.15.8

v5.15.9

v5.16

v5.16-rc1

v5.16-rc2

v5.16-rc3

v5.16-rc4

v5.16-rc5

v5.16-rc6

v5.16-rc7

v5.16-rc8

v5.17

v5.17-rc1

v5.17-rc2

v5.17-rc3

v5.17-rc4

v5.17-rc5

v5.17-rc6

v5.17-rc7

v5.17-rc8

v5.18

v5.18-rc1

v5.18-rc2

v5.18-rc3

v5.18-rc4

v5.18-rc5

v5.18-rc6

v5.18-rc7

v5.19

v5.19-rc1

v5.19-rc2

v5.19-rc3

v5.19-rc4

v5.19-rc5

v5.19-rc6

v5.19-rc7

v5.19-rc8

v5.6

v5.6-rc2

v5.6-rc3

v5.6-rc4

v5.6-rc5

v5.6-rc6

v5.6-rc7

v5.7

v5.7-rc1

v5.7-rc2

v5.7-rc3

v5.7-rc4

v5.7-rc5

v5.7-rc6

v5.7-rc7

v5.8

v5.8-rc1

v5.8-rc2

v5.8-rc3

v5.8-rc4

v5.8-rc5

v5.8-rc6

v5.8-rc7

v5.9

v5.9-rc1

v5.9-rc2

v5.9-rc3

v5.9-rc4

v5.9-rc5

v5.9-rc6

v5.9-rc7

v5.9-rc8

v6.*

v6.0

v6.0-rc1

v6.0-rc2

v6.0-rc3

v6.0-rc4

v6.0-rc5

v6.0-rc6

v6.0-rc7

v6.0.1

v6.0.2

v6.0.3

v6.0.4

v6.0.5

v6.1-rc1

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

5.7.0

Fixed

5.10.152

Type: ECOSYSTEM
Events: Introduced

5.11.0

Fixed

5.15.76

Type: ECOSYSTEM
Events: Introduced

5.16.0

Fixed

6.0.6