From 6a40e32bb10940f093d41a6c6e240b48d9ebd4eb Mon Sep 17 00:00:00 2001 From: Matt Mullins Date: Fri, 31 May 2019 12:47:54 -0700 Subject: [PATCH] x86/kgdb: Return 0 from kgdb_arch_set_breakpoint() err must be nonzero in order to reach text_poke(), which caused kgdb to fail to set breakpoints: (gdb) break __x64_sys_sync Breakpoint 1 at 0xffffffff81288910: file ../fs/sync.c, line 124. (gdb) c Continuing. Warning: Cannot insert breakpoint 1. Cannot access memory at address 0xffffffff81288910 Command aborted. Fixes: d6a824b5f2de ("x86/kgdb: Avoid redundant comparison of patched code") Signed-off-by: Matt Mullins Signed-off-by: Borislav Petkov Reviewed-by: Nadav Amit Cc: Andy Lutomirski Cc: Christophe Leroy Cc: Daniel Thompson Cc: Douglas Anderson Cc: "Gustavo A. R. Silva" Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: "Peter Zijlstra (Intel)" Cc: Rick Edgecombe Cc: Thomas Gleixner Cc: x86-ml Link: https://lkml.kernel.org/r/20190531194755.6320-1-mmullins@fb.com --- arch/x86/kernel/kgdb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c index 9a8c1648fc9a5..6690c5652aebd 100644 --- a/arch/x86/kernel/kgdb.c +++ b/arch/x86/kernel/kgdb.c @@ -758,7 +758,7 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) BREAK_INSTR_SIZE); bpt->type = BP_POKE_BREAKPOINT; - return err; + return 0; } int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) -- 2.39.5