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um: Do not use printk in userspace trampoline 

The trampoline is running in a cloned process. It is not safe to use
printk for error printing there.

Signed-off-by: Benjamin Berg <benjamin@sipsolutions.net>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Benjamin Berg 2023-11-10 12:03:44 +01:00 committed by Richard Weinberger
parent 139e6e8ef6
commit 6d64095ea8
1 changed files with 6 additions and 6 deletions
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12
arch/um/os-Linux/skas/process.c
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@ -221,8 +221,8 @@ static int userspace_tramp(void *stack)
addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
if (addr == MAP_FAILED) {
printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, errno = %d\n",
STUB_CODE, errno);
os_info("mapping mmap stub at 0x%lx failed, errno = %d\n",
STUB_CODE, errno);
exit(1);
}
@ -231,8 +231,8 @@ static int userspace_tramp(void *stack)
STUB_DATA_PAGES * UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED, fd, offset);
if (addr == MAP_FAILED) {
printk(UM_KERN_ERR "mapping segfault stack at 0x%lx failed, errno = %d\n",
STUB_DATA, errno);
os_info("mapping segfault stack at 0x%lx failed, errno = %d\n",
STUB_DATA, errno);
exit(1);
}
@ -242,8 +242,8 @@ static int userspace_tramp(void *stack)
sa.sa_sigaction = (void *) segv_handler;
sa.sa_restorer = NULL;
if (sigaction(SIGSEGV, &sa, NULL) < 0) {
printk(UM_KERN_ERR "%s - setting SIGSEGV handler failed - errno = %d\n",
__func__, errno);
os_info("%s - setting SIGSEGV handler failed - errno = %d\n",
__func__, errno);
exit(1);
}