gregkh@linuxfoundation.org wrote:

This is a note to let you know that I've just added the patch titled

powerpc/trace/syscalls: Update syscall name matching logic

to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: powerpc-trace-syscalls-update-syscall-name-matching-logic.patch and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

Please drop this patch from v3.18 as this depends on commit e145242ea0df6, which I don't see backported to v3.18.

Thanks, Naveen

From foo@baz Sun Jun 17 13:19:44 CEST 2018 From: "Naveen N. Rao" naveen.n.rao@linux.vnet.ibm.com Date: Fri, 4 May 2018 18:44:24 +0530 Subject: powerpc/trace/syscalls: Update syscall name matching logic

From: "Naveen N. Rao" naveen.n.rao@linux.vnet.ibm.com

[ Upstream commit 0b7758aaf6543b9a10c8671db559e9d374a3fd95 ]

On powerpc64 ABIv1, we are enabling syscall tracing for only ~20 syscalls. This is due to commit e145242ea0df6 ("syscalls/core, syscalls/x86: Clean up syscall stub naming convention") which has changed the syscall entry wrapper prefix from "SyS" to "__se_sys".

Update the logic for ABIv1 to not just skip the initial dot, but also the "__se_sys" prefix.

Fixes: commit e145242ea0df6 ("syscalls/core, syscalls/x86: Clean up syscall stub naming convention") Reported-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Naveen N. Rao naveen.n.rao@linux.vnet.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

---

arch/powerpc/include/asm/ftrace.h | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)

--- a/arch/powerpc/include/asm/ftrace.h +++ b/arch/powerpc/include/asm/ftrace.h @@ -65,13 +65,9 @@ struct dyn_arch_ftrace { #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) {

• /*

• * Compare the symbol name with the system call name. Skip the .sys or .SyS
  

• * prefix from the symbol name and the sys prefix from the system call name and
  

• * just match the rest. This is only needed on ppc64 since symbol names on
  

• * 32bit do not start with a period so the generic function will work.
  

• */
  

• return !strcmp(sym + 4, name + 3);

• /* We need to skip past the initial dot, and the __se_sys alias */
• return !strcmp(sym + 1, name) ||

• (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name));
  

} #endif #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 && !__ASSEMBLY__ */

Patches currently in stable-queue which might be from naveen.n.rao@linux.vnet.ibm.com are

queue-3.18/powerpc-trace-syscalls-update-syscall-name-matching-logic.patch