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| author | Ben Hutchings <ben@decadent.org.uk> | 2014-09-07 21:05:05 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-14 08:59:47 -0800 |
| commit | c8d171f62647794b4e7ab59b4fdd62e6b0e4cd42 (patch) | |
| tree | bb63b7b59a02e175a9a159917069273003e6b57d /arch | |
| parent | b1d9bf74d2ee549a0db336169a2cc02849dbf533 (diff) | |
| download | lwn-c8d171f62647794b4e7ab59b4fdd62e6b0e4cd42.tar.gz lwn-c8d171f62647794b4e7ab59b4fdd62e6b0e4cd42.zip | |
x86: Reject x32 executables if x32 ABI not supported
commit 0e6d3112a4e95d55cf6dca88f298d5f4b8f29bd1 upstream.
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
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -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 9c999c1674fa..01f15b227d7e 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -155,8 +155,9 @@ 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" |