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| author | Jeff Dike <jdike@addtoit.com> | 2007-03-07 20:41:26 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-08 07:38:22 -0800 |
| commit | 44f5c4ced6ddee2f5f2e45fa45b93370245d85bd (patch) | |
| tree | 0ba80acf1666a3fe82a3cb09ae0052b58c1d2af1 /arch/um/sys-x86_64 | |
| parent | 9bebff6ca5871e07b665cdaf71028ea21eb0bf0e (diff) | |
| download | linux-44f5c4ced6ddee2f5f2e45fa45b93370245d85bd.tar.gz linux-44f5c4ced6ddee2f5f2e45fa45b93370245d85bd.tar.bz2 linux-44f5c4ced6ddee2f5f2e45fa45b93370245d85bd.zip | |
[PATCH] uml: arch_prctl should set thread fs
In my previous x86_64 thread fix, I forgot to initialize thread.arch.fs in
arch_prctl. A process calling arch_prctl to set %fs would lose it on the
next context switch.
It also turns out that you can switch to a process which is in the process
of exiting and which has lost its mm. In this case, it's worse than
useless to try to call arch_prctl on the host process.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/sys-x86_64')
| -rw-r--r-- | arch/um/sys-x86_64/syscalls.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/um/sys-x86_64/syscalls.c b/arch/um/sys-x86_64/syscalls.c index 01b91f9fa789..b3f6350cac44 100644 --- a/arch/um/sys-x86_64/syscalls.c +++ b/arch/um/sys-x86_64/syscalls.c @@ -103,6 +103,9 @@ long arch_prctl_skas(struct task_struct *task, int code, switch(code){ case ARCH_SET_FS: + current->thread.arch.fs = (unsigned long) ptr; + save_registers(pid, ¤t->thread.regs.regs); + break; case ARCH_SET_GS: save_registers(pid, ¤t->thread.regs.regs); break; @@ -140,9 +143,8 @@ long sys_clone(unsigned long clone_flags, unsigned long newsp, void arch_switch_to_skas(struct task_struct *from, struct task_struct *to) { - if(to->thread.arch.fs == 0) + if((to->thread.arch.fs == 0) || (to->mm == NULL)) return; arch_prctl_skas(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs); } - |