diff options
| author |   Ben Hutchings <ben@decadent.org.uk> | 2014-09-07 21:05:05 +0100 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2014-10-08 11:17:42 +0200 |
| commit | 0e6d3112a4e95d55cf6dca88f298d5f4b8f29bd1 (patch) | |
| tree | 586843c4369dfd16f9db8df6912b6956488b910f /arch/x86 | |
| parent | x86_64, entry: Filter RFLAGS.NT on entry from userspace (diff) | |
| download | linux-dev-0e6d3112a4e95d55cf6dca88f298d5f4b8f29bd1.tar.xz linux-dev-0e6d3112a4e95d55cf6dca88f298d5f4b8f29bd1.zip | |
x86: Reject x32 executables if x32 ABI not supported
It is currently possible to execve() an x32 executable on an x86_64
kernel that has only ia32 compat enabled. However all its syscalls
will fail, even _exit(). This usually causes it to segfault.
Change the ELF compat architecture check so that x32 executables are
rejected if we don't support the x32 ABI.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Link: http://lkml.kernel.org/r/1410120305.6822.9.camel@decadent.org.uk
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/elf.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h index 1a055c81d864..ca3347a9dab5 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -160,8 +160,9 @@ do { \ #define elf_check_arch(x) \ ((x)->e_machine == EM_X86_64) -#define compat_elf_check_arch(x) \ - (elf_check_arch_ia32(x) || (x)->e_machine == EM_X86_64) +#define compat_elf_check_arch(x) \ + (elf_check_arch_ia32(x) || \ + (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64)) #if __USER32_DS != __USER_DS # error "The following code assumes __USER32_DS == __USER_DS" |