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I am using qemu-arm to run a statically linked binary on an Ubuntu system. There is little to no chance of emulating the entire system.

The binary reads /proc/cmdline as it starts up, to check for a specific parameter concerning MTD partitions. Obviously, my /proc/cmdline does not match.

Is there any easy way to alter the contents of /proc/cmdline for this emulated binary?

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The typical way to do something like this is to write a small library that intercepts open/read and fakes out the data your program is looking for, and then arrange for that library to be loaded by passing in an LD_PRELOAD environment variable (QEMU's -E option).

It's pretty straightforward; you could adapt the instructions here on emulating NVRAM in QEMU.

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