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authorChristoph Hellwig <hch@lst.de>2020-08-12 04:33:50 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-12 20:57:59 +0300
commitfe81417596fa8b6577fedb7e206ff3e4c7015c13 (patch)
tree848274a3e2d7426773d12ed77d83a8552802f51c /fs
parent3d13f313ce4c34c524ccc37986fe77172f601ff3 (diff)
downloadlinux-fe81417596fa8b6577fedb7e206ff3e4c7015c13.tar.xz
exec: use force_uaccess_begin during exec and exit
Both exec and exit want to ensure that the uaccess routines actually do access user pointers. Use the newly added force_uaccess_begin helper instead of an open coded set_fs for that to prepare for kernel builds where set_fs() does not exist. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Greentime Hu <green.hu@gmail.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Link: http://lkml.kernel.org/r/20200710135706.537715-7-hch@lst.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/exec.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 3698252719a3..29ef78ae9f50 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1402,7 +1402,12 @@ int begin_new_exec(struct linux_binprm * bprm)
if (retval)
goto out_unlock;
- set_fs(USER_DS);
+ /*
+ * Ensure that the uaccess routines can actually operate on userspace
+ * pointers:
+ */
+ force_uaccess_begin();
+
me->flags &= ~(PF_RANDOMIZE | PF_FORKNOEXEC | PF_KTHREAD |
PF_NOFREEZE | PF_NO_SETAFFINITY);
flush_thread();