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authorMarcin Nowakowski <marcin.nowakowski@imgtec.com>2016-10-12 09:32:56 +0200
committerRalf Baechle <ralf@linux-mips.org>2016-10-12 14:34:45 +0200
commit74f1077b5b783e7bf4fa3007cefdc8dbd6c07518 (patch)
tree82bb98c646ae13a434752ca2f5ebb2250192ac76 /arch/mips/include/asm/ptrace.h
parentMIPS: VDSO: Drop duplicated -I*/-E* aflags (diff)
downloadlinux-74f1077b5b783e7bf4fa3007cefdc8dbd6c07518.tar.xz
linux-74f1077b5b783e7bf4fa3007cefdc8dbd6c07518.zip
MIPS: ptrace: Fix regs_return_value for kernel context
Currently regs_return_value always negates reg[2] if it determines the syscall has failed, but when called in kernel context this check is invalid and may result in returning a wrong value. This fixes errors reported by CONFIG_KPROBES_SANITY_TEST Fixes: d7e7528bcd45 ("Audit: push audit success and retcode into arch ptrace.h") Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com> Cc: linux-mips@linux-mips.org Cc: stable@vger.kernel.org # 3.3+ Patchwork: https://patchwork.linux-mips.org/patch/14381/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/ptrace.h')
-rw-r--r--arch/mips/include/asm/ptrace.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrace.h
index f6fc6aac5496..b6578611dddb 100644
--- a/arch/mips/include/asm/ptrace.h
+++ b/arch/mips/include/asm/ptrace.h
@@ -152,7 +152,7 @@ static inline int is_syscall_success(struct pt_regs *regs)
static inline long regs_return_value(struct pt_regs *regs)
{
- if (is_syscall_success(regs))
+ if (is_syscall_success(regs) || !user_mode(regs))
return regs->regs[2];
else
return -regs->regs[2];