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arm64: add prctl control for resetting ptrauth keys

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Add an arm64-specific prctl to allow a thread to reinitialize its
pointer authentication keys to random values. This can be useful when
exec() is not used for starting new processes, to ensure that different
processes still have different keys.

Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Kristina Martsenko
2018-12-07 18:39:28 +00:00
committed by Will Deacon
parent ccc4381082
commit ba83088565
6 changed files with 71 additions and 0 deletions
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8
kernel/sys.c
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@@ -121,6 +121,9 @@
#ifndef SVE_GET_VL
# define SVE_GET_VL() (-EINVAL)
#endif
#ifndef PAC_RESET_KEYS
# define PAC_RESET_KEYS(a, b) (-EINVAL)
#endif
/*
* this is where the system-wide overflow UID and GID are defined, for
@@ -2476,6 +2479,11 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
return -EINVAL;
error = arch_prctl_spec_ctrl_set(me, arg2, arg3);
break;
case PR_PAC_RESET_KEYS:
if (arg3 || arg4 || arg5)
return -EINVAL;
error = PAC_RESET_KEYS(me, arg2);
break;
default:
error = -EINVAL;
break;