Gitweb: http://git.kernel.org/linus/cf6f196d112a6f6757b1ca3cce0b576f7abee479
Commit: cf6f196d112a6f6757b1ca3cce0b576f7abee479
Parent: 59d309f9c8ef0bd01bf93cc0e758f1d810417bdb
Author: Jason Wessel <jason.wessel@windriver.com>
AuthorDate: Fri Dec 11 08:43:16 2009 -0600
Committer: Jason Wessel <jason.wessel@windriver.com>
CommitDate: Fri Dec 11 08:43:16 2009 -0600
kgdb,i386: Fix corner case access to ss with NMI watch dog exception
It is possible for the user_mode_vm(regs) check to return true on the
i368 arch for a non master kgdb cpu or when the master kgdb cpu
handles the NMI watch dog exception.
The solution is simply to select the correct gdb_ss location
based on the check to user_mode_vm(regs).
CC: Ingo Molnar <mingo@elte.hu>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
---
arch/x86/kernel/kgdb.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index f93d015..aefae46 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -86,9 +86,15 @@ void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
gdb_regs[GDB_DS] = regs->ds;
gdb_regs[GDB_ES] = regs->es;
gdb_regs[GDB_CS] = regs->cs;
- gdb_regs[GDB_SS] = __KERNEL_DS;
gdb_regs[GDB_FS] = 0xFFFF;
gdb_regs[GDB_GS] = 0xFFFF;
+ if (user_mode_vm(regs)) {
+ gdb_regs[GDB_SS] = regs->ss;
+ gdb_regs[GDB_SP] = regs->sp;
+ } else {
+ gdb_regs[GDB_SS] = __KERNEL_DS;
+ gdb_regs[GDB_SP] = kernel_stack_pointer(regs);
+ }
#else
gdb_regs[GDB_R8] = regs->r8;
gdb_regs[GDB_R9] = regs->r9;
@@ -101,8 +107,8 @@ void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
gdb_regs32[GDB_PS] = regs->flags;
gdb_regs32[GDB_CS] = regs->cs;
gdb_regs32[GDB_SS] = regs->ss;
-#endif
gdb_regs[GDB_SP] = kernel_stack_pointer(regs);
+#endif
}
/**
--
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