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05 April 2024, 19:05:47 UTC
Revision 05d9d0b96e53c52a113fd783c0c97c830c8dc7af authored by Vineet Gupta on 19 August 2016, 19:10:02 UTC, committed by Al Viro on 13 September 2016, 21:49:41 UTC 
ARC: uaccess: get_user to zero out dest in cause of fault
 
Al reported potential issue with ARC get_user() as it wasn't clearing
out destination pointer in case of fault due to bad address etc.

Verified using following

| {
|  	u32 bogus1 = 0xdeadbeef;
|	u64 bogus2 = 0xdead;
|	int rc1, rc2;
|
|  	pr_info("Orig values %x %llx\n", bogus1, bogus2);
|	rc1 = get_user(bogus1, (u32 __user *)0x40000000);
|	rc2 = get_user(bogus2, (u64 __user *)0x50000000);
|	pr_info("access %d %d, new values %x %llx\n",
|		rc1, rc2, bogus1, bogus2);
| }

| [ARCLinux]# insmod /mnt/kernel-module/qtn.ko
| Orig values deadbeef dead
| access -14 -14, new values 0 0

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-snps-arc@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1 parent 8ae95ed
History
Tip revision: 05d9d0b96e53c52a113fd783c0c97c830c8dc7af authored by Vineet Gupta on 19 August 2016, 19:10:02 UTC
ARC: uaccess: get_user to zero out dest in cause of fault
Tip revision: 05d9d0b
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