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author | Ilya Leoshkevich <iii@linux.ibm.com> | 2020-07-23 00:58:54 +0300 |
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committer | Heiko Carstens <hca@linux.ibm.com> | 2020-07-27 11:33:28 +0300 |
commit | 73d6eb48d26930f0cbdc8bf1ccb0ad964e7d2b90 (patch) | |
tree | 4cde972f30659982c9c0d4e79960b41021c368c1 /arch/s390/lib/error-inject.c | |
parent | 4631f3ca493a7c8f9f31aef45fc0fc0e182155b7 (diff) | |
download | linux-73d6eb48d26930f0cbdc8bf1ccb0ad964e7d2b90.tar.xz |
s390: enable HAVE_FUNCTION_ERROR_INJECTION
This kernel feature is required for enabling BPF_KPROBE_OVERRIDE.
Define override_function_with_return() and regs_set_return_value()
functions, and fix compile errors in syscall_wrapper.h.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/lib/error-inject.c')
-rw-r--r-- | arch/s390/lib/error-inject.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/s390/lib/error-inject.c b/arch/s390/lib/error-inject.c new file mode 100644 index 000000000000..8c9d4da87eef --- /dev/null +++ b/arch/s390/lib/error-inject.c @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0+ +#include <asm/ptrace.h> +#include <linux/error-injection.h> +#include <linux/kprobes.h> + +void override_function_with_return(struct pt_regs *regs) +{ + /* + * Emulate 'br 14'. 'regs' is captured by kprobes on entry to some + * kernel function. + */ + regs->psw.addr = regs->gprs[14]; +} +NOKPROBE_SYMBOL(override_function_with_return); |