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The personality system call, starting with linux kernel commit v2.6.29-6609-g11d06b2a1e5658f448a308aa3beb97bacd64a940, always successfully changes the personality if requested. The syscall wrapper, however, still can return an error in the following cases: - the value returned by the system call looks like an error due to architecture limitations of 32-bit kernels; - a personality greater than 0xffffffff is passed to the system call, and the 64-bit kernel does not have commit v2.6.35-rc1-372-g485d527686850d68a0e9006dd9904f19f122485e that would truncate this value to unsigned int; - on sparc64, the value returned by the system call looks like an error due to sparc64 kernel sign extension bug. The solution is three-fold: - move generic syscalls.list personality entry to generic 64-bit syscalls.list file; - for each 32-bit architecture that use negated errno semantics, add a NOERRNO personality entry to their syscalls.list file; - for sparc64 and 32-bit architectures that use dedicated registers to flag syscall errors, add a wrapper around personality syscall; if the system call return value is flagged as an error, this wrapper returns the negated "would be errno" value, otherwise it returns the system call return value; on sparc64, it also truncates the personality argument to unsigned int before passing it to the kernel. [BZ #19408] * sysdeps/unix/sysv/linux/personality.c: New file. * sysdeps/unix/sysv/linux/sparc/sparc64/personality.c: Likewise. * sysdeps/unix/sysv/linux/tst-personality.c: Likewise. * sysdeps/unix/sysv/linux/Makefile [$(subdir) == misc] (sysdep_routines): Add personality. (tests): Add tst-personality. * sysdeps/unix/sysv/linux/syscalls.list (personality): Move ... * sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: ... here. * sysdeps/unix/sysv/linux/arm/syscalls.list (personality): New entry. * sysdeps/unix/sysv/linux/hppa/syscalls.list (personality): Likewise. * sysdeps/unix/sysv/linux/i386/syscalls.list (personality): Likewise. * sysdeps/unix/sysv/linux/m68k/syscalls.list (personality): Likewise. * sysdeps/unix/sysv/linux/microblaze/syscalls.list (personality): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/syscalls.list (personality): Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/syscalls.list (personality): Likewise. * sysdeps/unix/sysv/linux/sh/syscalls.list (personality): Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/syscalls.list (personality): Likewise. |
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.. | ||
bits | ||
coldfire | ||
m680x0 | ||
sys | ||
____longjmp_chk.c | ||
alphasort64.c | ||
arch-fork.h | ||
brk.c | ||
c++-types.data | ||
clone.S | ||
configure | ||
configure.ac | ||
dl-librecon.h | ||
dl-static.c | ||
fcntl.c | ||
fxstat.c | ||
fxstatat.c | ||
getdents64.c | ||
getmsg.c | ||
getpagesize.c | ||
getrlimit64.c | ||
getsysstats.c | ||
glob64.c | ||
Implies | ||
init-first.c | ||
kernel-features.h | ||
ldconfig.h | ||
ldsodefs.h | ||
libc-m68k-vdso.c | ||
localplt.data | ||
lockf64.c | ||
lxstat.c | ||
m68k-helpers.S | ||
m68k-vdso.c | ||
m68k-vdso.h | ||
Makefile | ||
mmap64.c | ||
mmap.S | ||
mremap.S | ||
oldgetrlimit64.c | ||
pt-vfork.c | ||
putmsg.c | ||
readdir64_r.c | ||
readdir64.c | ||
register-dump.h | ||
scandir64.c | ||
semtimedop.S | ||
setegid.c | ||
seteuid.c | ||
setgid.c | ||
setgroups.c | ||
setregid.c | ||
setresgid.c | ||
setresuid.c | ||
setreuid.c | ||
setuid.c | ||
sigcontextinfo.h | ||
syscall.S | ||
syscalls.list | ||
sysdep-cancel.h | ||
sysdep.h | ||
sysdep.S | ||
Versions | ||
versionsort64.c | ||
vfork.S | ||
xstat.c |