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x86/dumpstack: Don't dump kernel memory based on usermode RIP

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commit 342db04ae71273322f0011384a9ed414df8bdae4 upstream.

show_opcodes() is used both for dumping kernel instructions and for dumping
user instructions. If userspace causes #PF by jumping to a kernel address,
show_opcodes() can be reached with regs->ip controlled by the user,
pointing to kernel code. Make sure that userspace can't trick us into
dumping kernel memory into dmesg.

Fixes: 7cccf0725cf7 ("x86/dumpstack: Add a show_ip() function")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: security@kernel.org
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180828154901.112726-1-jannh@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jann Horn 2018-08-28 17:49:01 +02:00 committed by Greg Kroah-Hartman
parent 6575b15002
commit 8e6d156786
3 changed files with 17 additions and 8 deletions
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2
arch/x86/include/asm/stacktrace.h
View File

@ -111,6 +111,6 @@ static inline unsigned long caller_frame_pointer(void)
return (unsigned long)frame;
}
void show_opcodes(u8 *rip, const char *loglvl);
void show_opcodes(struct pt_regs *regs, const char *loglvl);
void show_ip(struct pt_regs *regs, const char *loglvl);
#endif /* _ASM_X86_STACKTRACE_H */

21
arch/x86/kernel/dumpstack.c
View File

@ -92,23 +92,32 @@ static void printk_stack_address(unsigned long address, int reliable,
* Thus, the 2/3rds prologue and 64 byte OPCODE_BUFSIZE is just a random
* guesstimate in attempt to achieve all of the above.
*/
void show_opcodes(u8 *rip, const char *loglvl)
void show_opcodes(struct pt_regs *regs, const char *loglvl)
{
unsigned int code_prologue = OPCODE_BUFSIZE * 2 / 3;
u8 opcodes[OPCODE_BUFSIZE];
u8 *ip;
unsigned long ip;
int i;
bool bad_ip;
printk("%sCode: ", loglvl);
ip = (u8 *)rip - code_prologue;
if (probe_kernel_read(opcodes, ip, OPCODE_BUFSIZE)) {
ip = regs->ip - code_prologue;
/*
* Make sure userspace isn't trying to trick us into dumping kernel
* memory by pointing the userspace instruction pointer at it.
*/
bad_ip = user_mode(regs) &&
__chk_range_not_ok(ip, OPCODE_BUFSIZE, TASK_SIZE_MAX);
if (bad_ip || probe_kernel_read(opcodes, (u8 *)ip, OPCODE_BUFSIZE)) {
pr_cont("Bad RIP value.\n");
return;
}
for (i = 0; i < OPCODE_BUFSIZE; i++, ip++) {
if (ip == rip)
if (ip == regs->ip)
pr_cont("<%02x> ", opcodes[i]);
else
pr_cont("%02x ", opcodes[i]);
@ -123,7 +132,7 @@ void show_ip(struct pt_regs *regs, const char *loglvl)
#else
printk("%sRIP: %04x:%pS\n", loglvl, (int)regs->cs, (void *)regs->ip);
#endif
show_opcodes((u8 *)regs->ip, loglvl);
show_opcodes(regs, loglvl);
}
void show_iret_regs(struct pt_regs *regs)

2
arch/x86/mm/fault.c
View File

@ -838,7 +838,7 @@ show_signal_msg(struct pt_regs *regs, unsigned long error_code,
printk(KERN_CONT "\n");
show_opcodes((u8 *)regs->ip, loglvl);
show_opcodes(regs, loglvl);
}
static void