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| author | Kristina Martsenko <kristina.martsenko@arm.com> | 2018-12-07 19:39:28 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-12-13 17:42:46 +0100 |
| commit | ba830885656414101b2f8ca88786524d4bb5e8c1 (patch) | |
| tree | 9112fbf1aee1ffcb239e5c24b767208ae0a8eec2 /kernel/sys.c | |
| parent | arm64: perf: strip PAC when unwinding userspace (diff) | |
| download | linux-ba830885656414101b2f8ca88786524d4bb5e8c1.tar.xz linux-ba830885656414101b2f8ca88786524d4bb5e8c1.zip | |
arm64: add prctl control for resetting ptrauth keys
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>
Diffstat (limited to 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index 123bd73046ec..64b5a230f38d 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -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; |