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do_coredump(): make sure that descriptor table isn't shared

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-08-21 22:43:47 -04:00
parent c3c073f808
commit 179e037fc1
1 changed files with 7 additions and 0 deletions
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7
fs/exec.c
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@ -2066,6 +2066,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
int retval = 0; int retval = 0;
int flag = 0; int flag = 0;
int ispipe; int ispipe;
struct files_struct *displaced;
bool need_nonrelative = false; bool need_nonrelative = false;
static atomic_t core_dump_count = ATOMIC_INIT(0); static atomic_t core_dump_count = ATOMIC_INIT(0);
struct coredump_params cprm = { struct coredump_params cprm = {
@ -2219,6 +2220,12 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
goto close_fail; goto close_fail;
} }
/* get us an unshared descriptor table; almost always a no-op */
retval = unshare_files(&displaced);
if (retval)
goto close_fail;
if (displaced)
put_files_struct(displaced);
retval = binfmt->core_dump(&cprm); retval = binfmt->core_dump(&cprm);
if (retval) if (retval)
current->signal->group_exit_code |= 0x80; current->signal->group_exit_code |= 0x80;