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[PATCH v2 08/24] linux-user/syscall: introduce prctl for indirect branch
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From: |
Deepak Gupta |
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Subject: |
[PATCH v2 08/24] linux-user/syscall: introduce prctl for indirect branch tracking |
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Date: |
Mon, 29 Jul 2024 10:53:10 -0700 |
Each application enables indirect branch tracking (forward cfi) for itself
via prctl. Adding branch tracking prctl in linux-user/syscall.
Using same prctl code as proposed in cfi patches in kernel mailing list [1]
[1] - https://lore.kernel.org/all/20240403234054.2020347-1-debug@rivosinc.com/
Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Co-developed-by: Jim Shu <jim.shu@sifive.com>
Co-developed-by: Andy Chiu <andy.chiu@sifive.com>
Co-developed-by: Jesse Huang <jesse.huang@sifive.com>
---
linux-user/syscall.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index b8c278b91d..ec157c1088 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6295,6 +6295,17 @@ abi_long do_arch_prctl(CPUX86State *env, int code,
abi_ulong addr)
# define PR_SME_VL_INHERIT (1 << 17)
#endif
+#ifndef PR_GET_INDIR_BR_LP_STATUS
+# define PR_GET_INDIR_BR_LP_STATUS 74
+#endif
+#ifndef PR_SET_INDIR_BR_LP_STATUS
+# define PR_SET_INDIR_BR_LP_STATUS 75
+# define PR_INDIR_BR_LP_ENABLE (1UL << 0)
+#endif
+#ifndef PR_LOCK_INDIR_BR_LP_STATUS
+# define PR_LOCK_INDIR_BR_LP_STATUS 76
+#endif
+
#include "target_prctl.h"
static abi_long do_prctl_inval0(CPUArchState *env)
@@ -6477,6 +6488,14 @@ static abi_long do_prctl(CPUArchState *env, abi_long
option, abi_long arg2,
case PR_SET_TSC:
/* Disable to prevent the target disabling stuff we need. */
return -TARGET_EINVAL;
+ case PR_GET_INDIR_BR_LP_STATUS:
+ case PR_SET_INDIR_BR_LP_STATUS:
+ case PR_LOCK_INDIR_BR_LP_STATUS:
+#ifndef do_prctl_cfi
+ return do_prctl_inval1(env, arg2);
+#else
+ return do_prctl_cfi(env, option, arg2);
+#endif
default:
qemu_log_mask(LOG_UNIMP, "Unsupported prctl: " TARGET_ABI_FMT_ld "\n",
--
2.44.0
- [PATCH v2 01/24] target/riscv: Add zicfilp extension, (continued)
- [PATCH v2 01/24] target/riscv: Add zicfilp extension, Deepak Gupta, 2024/07/29
- [PATCH v2 02/24] target/riscv: Introduce elp state and enabling controls for zicfilp, Deepak Gupta, 2024/07/29
- [PATCH v2 03/24] target/riscv: save and restore elp state on priv transitions, Deepak Gupta, 2024/07/29
- [PATCH v2 05/24] target/riscv: tracking indirect branches (fcfi) for zicfilp, Deepak Gupta, 2024/07/29
- [PATCH v2 04/24] target/riscv: additional code information for sw check, Deepak Gupta, 2024/07/29
- [PATCH v2 06/24] target/riscv: zicfilp `lpad` impl and branch tracking, Deepak Gupta, 2024/07/29
- [PATCH v2 07/24] disas/riscv: enabled `lpad` disassembly, Deepak Gupta, 2024/07/29
- [PATCH v2 08/24] linux-user/syscall: introduce prctl for indirect branch tracking,
Deepak Gupta <=
- [PATCH v2 09/24] linux-user/riscv: implement indirect branch tracking prctls, Deepak Gupta, 2024/07/29
- [PATCH v2 10/24] target/riscv: Add zicfiss extension, Deepak Gupta, 2024/07/29
- [PATCH v2 11/24] target/riscv: introduce ssp and enabling controls for zicfiss, Deepak Gupta, 2024/07/29
- [PATCH v2 16/24] target/riscv: shadow stack mmu index for shadow stack instructions, Deepak Gupta, 2024/07/29
- [PATCH v2 12/24] target/riscv: tb flag for shadow stack instructions, Deepak Gupta, 2024/07/29
- [PATCH v2 15/24] target/riscv: mmu changes for zicfiss shadow stack protection, Deepak Gupta, 2024/07/29
- [PATCH v2 13/24] target/riscv: implement zicfiss instructions, Deepak Gupta, 2024/07/29
- [PATCH v2 14/24] target/riscv: compressed encodings for sspush and sspopchk, Deepak Gupta, 2024/07/29