on ARM error about pagemap HOT 7 OPEN

Thanks to the rowhammer attack, it looks like Linux now requires root privileges to access /proc/pid/pagemap (even if you ran the process yourself):

To make life harder for attackers attempting to exploit the rowhammer vulnerability, a simple patch was merged for the 4.0-rc5 release in March. The patch turned the pagemap file into a privileged interface; attempts to open it will now fail unless the process in question has the CAP_SYS_ADMIN capability. The 4.0 release came out with that restriction in place, and everybody who was paying attention slept a little easier.

From https://lwn.net/Articles/642069/. Try using sudo or logging in as root.

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nope.. is not that.. I have full access to pagemap! (older kernel on a test machine)

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Hi
You can change "unsigned long data;" to "unsigned long long data;" in arm32.

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@Zibri, can you confirm exactly which architecture you are using? arm32 vs arm64. Thanks.

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ARM 32 cortex a9

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Hi,

I'm facing the same issue on ARM.
$ ./pagemap2 711
=== Maps for pid 711
pread: Invalid argument
pread: Invalid argument
pread: Invalid argument
pread: Invalid argument

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I changed "unsigned long" to the portable "uint64_t" in this PR, might fix this issue
#3

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