Commit 5079b1d1 authored by Borislav Petkov's avatar Borislav Petkov Committed by Greg Kroah-Hartman

x86/a.out: Clear the dump structure initially

commit 10970e1b4be9c74fce8ab6e3c34a7d718f063f2c upstream.

dump_thread32() in aout_core_dump() does not clear the user32 structure
allocated on the stack as the first thing on function entry.

As a result, the dump.u_comm, dump.u_ar0 and dump.signal which get
assigned before the clearing, get overwritten.

Rename that function to fill_dump() to make it clear what it does and
call it first thing.

This was caught while staring at a patch by Derek Robson
Signed-off-by: default avatarBorislav Petkov <>
Cc: Derek Robson <>
Cc: Linus Torvalds <>
Cc: Michael Matz <>
Cc: <>
Link: default avatarGreg Kroah-Hartman <>
parent 492647b2
......@@ -50,7 +50,7 @@ static unsigned long get_dr(int n)
* fill in the user structure for a core dump..
static void dump_thread32(struct pt_regs *regs, struct user32 *dump)
static void fill_dump(struct pt_regs *regs, struct user32 *dump)
u32 fs, gs;
memset(dump, 0, sizeof(*dump));
......@@ -156,10 +156,12 @@ static int aout_core_dump(struct coredump_params *cprm)
fs = get_fs();
has_dumped = 1;
fill_dump(cprm->regs, &dump);
strncpy(dump.u_comm, current->comm, sizeof(current->comm));
dump.u_ar0 = offsetof(struct user32, regs);
dump.signal = cprm->siginfo->si_signo;
dump_thread32(cprm->regs, &dump);
* If the size of the dump file exceeds the rlimit, then see
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