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coredump: fix dumping through pipes

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The offset in the core file used to be tracked with ->written field of
the coredump_params structure. The field was retired in favour of
file->f_pos.

However, ->f_pos is not maintained for pipes which leads to breakage.

Restore explicit tracking of the offset in coredump_params. Introduce
->pos field for this purpose since ->written was already reused.

Fixes: a008393951 ("get rid of coredump_params->written").

Reported-by: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Signed-off-by: Mateusz Guzik <mguzik@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Mateusz Guzik
2016-06-05 23:14:14 +02:00
committed by Al Viro
parent a01e718f72
commit 1607f09c22
5 changed files with 7 additions and 4 deletions
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include/linux/binfmts.h
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@@ -65,6 +65,7 @@ struct coredump_params {
unsigned long limit;
unsigned long mm_flags;
loff_t written;
loff_t pos;
};
/*