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Bug 1553216 - (CVE-2018-7755) CVE-2018-7755 kernel: Information exposure in fd_locked_ioctl function in drivers/block/floppy.c
CVE-2018-7755 kernel: Information exposure in fd_locked_ioctl function in dri...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20180308,reported=2...
: Reopened, Security
Depends On: 1555356 1555419 1555420 1555421 1553217
Blocks: 1553219
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Reported: 2018-03-08 09:18 EST by Pedro Sampaio
Modified: 2018-09-21 10 EDT (History)
48 users (show)

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Doc Text:
An issue was discovered in the fd_locked_ioctl function in drivers/block/floppy.c in the Linux kernel. The floppy driver will copy a kernel pointer to user memory in response to the FDGETPRM ioctl. An attacker can send the FDGETPRM ioctl and use the obtained kernel pointer to discover the location of kernel code and data and bypass kernel security protections such as KASLR.
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Clone Of:
Environment:
Last Closed: 2018-03-14 10:39:43 EDT
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Regression: ---
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CRM:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Pedro Sampaio 2018-03-08 09:18:18 EST 
An issue was discovered in the fd_locked_ioctl function in drivers/block/floppy.c in the Linux kernel through 4.15.7. The floppy driver will copy a kernel pointer to user memory in response to the FDGETPRM ioctl. An attacker can send the FDGETPRM ioctl and use the obtained kernel pointer to discover the location of kernel code and data and bypass kernel security protections such as KASLR.

References:

https://lkml.org/lkml/2018/3/7/1116

https://marc.info/?l=linux-kernel&m=152046737321740&w=2
Comment 1 Pedro Sampaio 2018-03-08 09:19:39 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1553217]
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