Messages in this thread Patch in this message | | | Date | Thu, 9 Apr 2015 02:02:33 -0700 | From | tip-bot for Denys Vlasenko <> | Subject | [tip:x86/asm] x86/asm/entry: Zero EXTRA_REGS for stub32_execve() too |
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Commit-ID: 0f90fb979d7b53d80a6d5cb6e127b4b4b249907e Gitweb: http://git.kernel.org/tip/0f90fb979d7b53d80a6d5cb6e127b4b4b249907e Author: Denys Vlasenko <dvlasenk@redhat.com> AuthorDate: Tue, 7 Apr 2015 22:43:39 +0200 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Thu, 9 Apr 2015 10:31:24 +0200
x86/asm/entry: Zero EXTRA_REGS for stub32_execve() too
The change which affected how execve clears EXTRA_REGS missed 32-bit execve syscalls.
Fix this by using 64-bit execve stub epilogue for them too.
Run-tested.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Cc: Alexei Starovoitov <ast@plumgrid.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Drewry <wad@chromium.org> Link: http://lkml.kernel.org/r/1428439424-7258-3-git-send-email-dvlasenk@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/ia32/ia32entry.S | 2 -- arch/x86/kernel/entry_64.S | 15 +++++++++++++++ 2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S index 5d8f987..a821b1c 100644 --- a/arch/x86/ia32/ia32entry.S +++ b/arch/x86/ia32/ia32entry.S @@ -571,8 +571,6 @@ GLOBAL(\label) PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn PTREGSCALL stub32_sigreturn, sys32_sigreturn - PTREGSCALL stub32_execve, compat_sys_execve - PTREGSCALL stub32_execveat, compat_sys_execveat PTREGSCALL stub32_fork, sys_fork PTREGSCALL stub32_vfork, sys_vfork diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index f7d9ba6..5380b3a 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -538,6 +538,21 @@ ENTRY(stub_x32_execveat) END(stub_x32_execveat) #endif +#ifdef CONFIG_IA32_EMULATION +ENTRY(stub32_execve) + CFI_STARTPROC + call compat_sys_execve + jmp return_from_execve + CFI_ENDPROC +END(stub32_execve) +ENTRY(stub32_execveat) + CFI_STARTPROC + call compat_sys_execveat + jmp return_from_execve + CFI_ENDPROC +END(stub32_execveat) +#endif + /* * sigreturn is special because it needs to restore all registers on return. * This cannot be done with SYSRET, so use the IRET return path instead.
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