From: Josh Poimboeuf <[email protected]> The kernel doesn't have direct visibility to the ELF contents of shared libraries. Add some prctl() interfaces which allow glibc to tell the kernel where to find .sframe sections.
Signed-off-by: Josh Poimboeuf <[email protected]> Signed-off-by: Steven Rostedt (Google) <[email protected]> --- include/uapi/linux/prctl.h | 5 ++++- kernel/sys.c | 9 +++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h index 15c18ef4eb11..4973c932341b 100644 --- a/include/uapi/linux/prctl.h +++ b/include/uapi/linux/prctl.h @@ -351,7 +351,7 @@ struct prctl_mm_map { * configuration. All bits may be locked via this call, including * undefined bits. */ -#define PR_LOCK_SHADOW_STACK_STATUS 76 +#define PR_LOCK_SHADOW_STACK_STATUS 76 /* * Controls the mode of timer_create() for CRIU restore operations. @@ -364,4 +364,7 @@ struct prctl_mm_map { # define PR_TIMER_CREATE_RESTORE_IDS_ON 1 # define PR_TIMER_CREATE_RESTORE_IDS_GET 2 +#define PR_ADD_SFRAME 78 +#define PR_REMOVE_SFRAME 79 + #endif /* _LINUX_PRCTL_H */ diff --git a/kernel/sys.c b/kernel/sys.c index c434968e9f5d..d76665e4df7e 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -64,6 +64,7 @@ #include <linux/rcupdate.h> #include <linux/uidgid.h> #include <linux/cred.h> +#include <linux/sframe.h> #include <linux/nospec.h> @@ -2820,6 +2821,14 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, return -EINVAL; error = posixtimer_create_prctl(arg2); break; + case PR_ADD_SFRAME: + error = sframe_add_section(arg2, arg3, arg4, arg5); + break; + case PR_REMOVE_SFRAME: + if (arg3 || arg4 || arg5) + return -EINVAL; + error = sframe_remove_section(arg2); + break; default: trace_task_prctl_unknown(option, arg2, arg3, arg4, arg5); error = -EINVAL; -- 2.47.2
