Re: [LTP] ioctl10: fix the sscanf() call to handle 64-bit inode on 32-bit arch

[linuxtestproject.agent@gmail.com]

Hi Jeff,

On Fri, 26 Jun 2026, Jeff Layton wrote:
> ioctl10: fix the sscanf() call to handle 64-bit inode on 32-bit arch

> -	unsigned long vm_inode;
> +	uint64_t vm_inode;

> -			if (sscanf(line, "%lx-%lx %s %lx %x:%x %lu %s",
> +			if (sscanf(line, "%lx-%lx %s %lx %x:%x %llu %s",

The type change to uint64_t is correct, but %llu is the format
specifier for unsigned long long, not for uint64_t. On LP64
platforms (x86_64, aarch64), uint64_t is unsigned long, so passing
a uint64_t * where sscanf expects unsigned long long * is
undefined behavior and will produce -Wformat warnings on 64-bit
builds.

The portable fix is to use SCNu64 from <inttypes.h>:

    if (sscanf(line, "%lx-%lx %s %lx %x:%x %" SCNu64 " %s",

Verdict - Needs revision

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