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| author |   Borislav Petkov <bp@suse.de> | 2019-02-12 14:28:03 +0100 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2019-02-13 12:10:51 +0100 |
| commit | 10970e1b4be9c74fce8ab6e3c34a7d718f063f2c (patch) | |
| tree | 679b860fb9f0bb90068d414aca73005dc007cc9e /arch/x86/ia32 | |
| parent | x86/mm: Make set_pmd_at() paravirt aware (diff) | |
| download | linux-dev-10970e1b4be9c74fce8ab6e3c34a7d718f063f2c.tar.xz linux-dev-10970e1b4be9c74fce8ab6e3c34a7d718f063f2c.zip | |
x86/a.out: Clear the dump structure initially
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
<robsonde@gmail.com>.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Derek Robson <robsonde@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Matz <matz@suse.de>
Cc: x86@kernel.org
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20190202005512.3144-1-robsonde@gmail.com
Diffstat (limited to 'arch/x86/ia32')
| -rw-r--r-- | arch/x86/ia32/ia32_aout.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/ia32/ia32_aout.c b/arch/x86/ia32/ia32_aout.c index f65b78d32f5e..7dbbe9ffda17 100644 --- a/arch/x86/ia32/ia32_aout.c +++ b/arch/x86/ia32/ia32_aout.c @@ -51,7 +51,7 @@ 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)); @@ -157,10 +157,12 @@ static int aout_core_dump(struct coredump_params *cprm) fs = get_fs(); set_fs(KERNEL_DS); 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 |