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Nicolas Bouchinet
a231f5bdfd
Commit3b3376f222("sysctl.c: fix underflow value setting risk in vm_table") fixes underflow value setting risk in vm_table but misses vdso_enabled sysctl. vdso_enabled sysctl is initialized with .extra1 value as SYSCTL_ZERO to avoid negative value writes but the proc_handler is proc_dointvec and not proc_dointvec_minmax and thus do not uses .extra1 and .extra2. The following command thus works : `# echo -1 > /proc/sys/vm/vdso_enabled` This patch properly sets the proc_handler to proc_dointvec_minmax. In addition to .extra1, .extra2 is set to SYSCTL_ONE. The sysctl is thus bounded between 0 and 1. Fixes:3b3376f222("sysctl.c: fix underflow value setting risk in vm_table") Signed-off-by: Nicolas Bouchinet <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Kees Cook <[email protected]> Signed-off-by: Joel Granados <[email protected]>