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[IA64] preserve personality flag bits across exec

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In its <asm/elf.h> ia64 defines SET_PERSONALITY in a way that unconditionally
sets the personality of the current process to PER_LINUX, losing any flag bits
from the upper 3 bytes of current->personality.  This is wrong. Those bits are
intended to be inherited across exec (other code takes care of ensuring that
security sensitive bits like ADDR_NO_RANDOMIZE are not passed to unsuspecting
setuid/setgid applications).

Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Tony Luck 2010-02-12 08:17:58 -08:00
parent deb0c98c7f
commit 22208ac586
1 changed files with 3 additions and 1 deletions
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4
arch/ia64/include/asm/elf.h
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@ -201,7 +201,9 @@ extern void ia64_elf_core_copy_regs (struct pt_regs *src, elf_gregset_t dst);
relevant until we have real hardware to play with... */
#define ELF_PLATFORM NULL
#define SET_PERSONALITY(ex) set_personality(PER_LINUX)
#define SET_PERSONALITY(ex) \
set_personality((current->personality & ~PER_MASK) | PER_LINUX)
#define elf_read_implies_exec(ex, executable_stack) \
((executable_stack!=EXSTACK_DISABLE_X) && ((ex).e_flags & EF_IA_64_LINUX_EXECUTABLE_STACK) != 0)